Roseanna Gamlen-Greene
Doctor of Philosophy in Forestry (PhD)
Research Topic
Conserving amphibians in a dynamic world: the introduction of the Northern red-legged frog to Haida Gwaii
John Richardson
Professor
Research Classification
Research Interests
Ecology
freshwater biology
food webs
streams
forest
Relevant Degree Programs
Research Methodology
experimental, hypothesis-driven research
Modelling
field studies
large-scale experiments
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Postdoctoral Fellows
Graduate Student Supervision
Doctoral Student Supervision (Jan 2008 - Mar 2019)
Cumulative effects of multiple agricultural stressors on freshwater ecosystems (2018)
Agriculture is the primary cause of sedimentation, nutrient enrichment, and insecticide contamination of freshwater ecosystems. Despite the widespread co-occurrence of these ecological stressors, little is known about their potential interactive effects. I conducted three experiments manipulating combinations of these stressors in order to evaluate their cumulative effects on freshwater ecosystems at different scales of biological organization (community, ecosystem, meta-ecosystem). First, I evaluated stream invertebrate community responses to sedimentation, nutrient enrichment, and the insecticide chlorpyrifos using laboratory microcosms with distinct microhabitats. I demonstrated that chlorpyrifos can interact non-additively with fine sediment (reversal) and nutrients (antagonism), with potentially deleterious impacts on small-sized invertebrates. Furthermore, invertebrates in gravel microhabitats were more severely affected than those in leaf packs. Second, I manipulated levels of nutrients, sediment, and the insecticide imidacloprid in experimental pond ecosystems. I demonstrated these stressors had antagonistic effects on pelagic and benthic invertebrate diversity. Moreover, the results suggested imidacloprid increased ecosystem metabolism indirectly, through negative effects on invertebrate consumers. Finally, I explored processes at the scale of the river network meta-ecosystem. Using a network of experimental channels, I investigated how multiple-stressor interactions within tributaries affected downstream ecosystems. My results indicated that complex nutrient-sediment interactions within tributaries could strongly alter the flux of organisms from tributaries to downstream ecosystems. Furthermore, I observed that at small spatial scales, these alterations of within-network migration patterns could be more influential than the transport of the stressors from headwaters to recipient ecosystems. My research contributes novel evidence suggesting that complex interactions among nutrient enrichment, sedimentation, and insecticide contamination are frequent in freshwater ecosystems, and have distinct mechanisms operating at different scales. In particular, these findings underscore the importance of considering multiple-stressor interactions in insecticide environmental risk assessments; even at low concentrations, interactions with other stressors may result in unexpected negative effects for aquatic biota and ecosystem processes.
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Riparian forest management and regeneration : effects on forest structure and stream ecological processes in streams of eastern Amazon, Brazil (2018)
In tropical areas, deforestation and forest degradation are major threats to forests and the surrounding ecosystems, such as riparian forests and streams. These threats to riparian forests and streams in agricultural areas can be reduced by the implementation of riparian buffers. However, disturbances from cleared areas may still impact the forests due to the high edge-to-area ratio of buffers. Selective logging inside the buffers also has the potential to degrade riparian forests and streams. Forest regeneration has the potential to restore ecosystems in degraded lands, but disturbances from ongoing agriculture are expected to arrest or delay the regeneration process in the buffers. I evaluated the efficacy of two riparian buffer management strategies: (1) land abandonment for natural regeneration and (2) the maintenance of mature forest. I also sampled additional sites of different ages to evaluate where buffer treatments fit after riparian forest alterations. I hypothesized that the riparian buffers resulting from land abandonment would have less forest canopy, simpler stand structure, less large wood, higher primary production, and higher decomposition rates than a regenerated riparian forest that was surrounded by mature forest. I expected the same outcomes when comparing the riparian buffers of mature forest versus mature riparian reference sites. I found that forest structure did not differ significantly between riparian buffer management treatments, however, my ordination analysis revealed signs of forest degradation after selective logging in the riparian buffers of mature forest. I found no significant effect of riparian buffer management in any stream variable studied. Large wood was related to channel width and stem density. Stream respiration increased and primary production decreased as the regeneration process advances. Decomposition differed among species, apparently by differences on leaf structural compounds. My results show that both buffer management strategies can be effective for protection of riparian and stream ecosystem in agricultural landscapes. Land abandonment is a viable and inexpensive restoration action where ongoing disturbances are mild and the propagules for regeneration are available. While the implementation of riparian buffers of mature forests is an effective strategy, selective logging should be excluded from these areas as disturbances may intensify in the future.
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The influence of physical habitat structure on invertebrate drift and Pacific salmon production in forest streams (2018)
Untangling the mechanisms linking the physical world to ecological processes is paramount for effectively conserving and restoring habitat for threatened species. Pacific salmon rearing in small streams have been particularly well studied in this regard given that physical habitat features (e.g., velocity) strongly influence their performance and that habitat alteration is a major cause of their decline in many areas. However, despite strong evidence that stream salmonids are food limited, we lack commensurate understanding of how habitat influences their food supply - suspended invertebrates drifting downstream (invertebrate drift). Consequently, the mechanisms linking physical habitat structure to salmonid production remain unclear. My dissertation attempts to address this issue. First, in Chapter 2, I review and synthesize the mechanisms underlying invertebrate drift, discuss potential caveats in methodology, and identify key knowledge gaps. I particularly highlight how the physical and behavioural processes governing drift entry are highly dependent on context-specific abiotic and biotic attributes (e.g., hydraulics, individual condition). In Chapter 3, I use flow manipulation experiments to show that some of this context dependency can be explained by considering behavioural and morphological traits of invertebrate taxa, which underlie their tendencies to drift behaviourally or passively; for instance, body shape predicted the magnitude of responses to increased flows. In Chapter 4, I show that aggregate community-level drift rates vary spatially in streams over scales relevant to individual drift-feeding salmonids. Specifically, I measured spatially explicit rates of drift production, demonstrating that shallow high velocity riffles and deep low velocity pools form distinct sources and sinks of drift within stream networks. In Chapter 5 I build on this result to show that drift generation in riffles coupled with strong preferences for low velocity pools by salmonids leads to maximum fish production occurring in habitats with intermediate ratios of pool-riffle areas; in essence, a trade-off between increasing space but declining food as pool area increases. I extend these results with bioenergetic simulations to show that the shape of this trade-off is sensitive to alternative modes of prey delivery (e.g., aerial inputs of terrestrial invertebrates), which may be decoupled from in-stream habitat conditions.
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Effects of predators on the carbon dioxide dynamics of freshwater ecosystems (2013)
Freshwater ecosystems are important natural emitters of the greenhouse gas CO₂. The magnitude and direction of the exchange of CO₂ between freshwaters and the atmosphere, or flux, is influenced by the concentration of CO₂ in the water. Every organism within a freshwater ecosystem influences the net CO₂ balance of that ecosystem either through respiration, photosynthesis or both. Thus, large changes in populations due to natural or anthropogenic stressors and the underlying food web structure of the ecosystem have the potential to alter CO₂ fluxes of aquatic ecosystems. To evaluate the influences of species loss on food web structure and CO₂ fluxes of aquatic ecosystems, I experimentally manipulated species from different consumer trophic levels (predator, grazer, or detritivore) and tested the effects of these losses on CO₂ fluxes of experimental streams, ponds and bromeliads. In streams, I found that influences on CO₂ emissions were most sensitive to the loss of a predatory insect compared to other trophic levels, including a tadpole grazer and an insect detritivore. Similarly, the removal of a fish predator to ponds or an insect predator to bromeliads resulted in trophic cascades that significantly influenced the CO₂ flux of the ecosystem. Both the identity of the predator and interspecific competition among predatory insects influenced the strengths of cascading effects of predators on CO₂ emissions from bromeliads. However, across all three ecosystems (streams, ponds, and bromeliads) predators, via trophic cascades, had surprisingly consistent effects on the CO₂ flux of the ecosystem. Finally, as alterations to predator abundance often occurs in concert with increasing water temperatures and nutrient loading, I determined the individual and interactive effects of these stressors on pond communities. I found that nutrients often increased top-down control of predators on CO₂ fluxes, but the individual effect of warming and its combined effects with nutrients had negative effects on both consumers and primary producers making predictions about CO₂ fluxes complicated. My results provide novel insights into the influence of predators and food web structure on CO₂ fluxes and the potential for predator loss to markedly alter CO₂ fluxes of freshwaters.
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Can conservation strategies for a single species be used to inform and guide restoration of ecological structure and function in floodplain ponds? (2011)
Freshwater ecosystems worldwide are degraded by habitat loss, fragmentation and conversion. The practice of ecological river restoration has developed to address degradation, but there has been limited monitoring and assessment of river restoration projects that could be used to improve the science of restoration ecology. I used meta-analysis and studied floodplain ponds restored for juvenile coho salmon (Oncorhynchus kisutch) in southwestern British Columbia, Canada to test ecological and conservation science hypotheses about how restoration projects are planned and assessed. I evaluated the efficacy of the umbrella species concept, which suggests that conservation strategies designed for one species may benefit co-occurring species, using meta-analysis. I empirically assessed the potential for coho to be an umbrella species in restored ponds. I studied the relationship between biodiversity and ecosystem function (i.e., standing biomass) and explicitly considered the role of habitat complexity in mediating that relationship. I evaluated the influence of habitat at different scales (watershed, pond and micro-habitat) on the abundance and biomass of juvenile coho and other aquatic vertebrates. I used standard meta-analytic techniques to assess the umbrella species concept and found conservation strategies designed for umbrella species generally benefit co-occurring species. For the empirical studies, I sampled vertebrates in 17 restored ponds in three watersheds three times over a year. I sampled benthic invertebrates and algae once and documented habitat (e.g., depth, cover) at the pond and trap scale. Coho abundance and biomass, as well as that of other aquatic species, varied across ponds indicating a gradient in response to restoration. There was a positive relationship between species diversity and standing biomass, although that relationship was not consistent across taxonomic groups or with respect to habitat complexity. There was a relationship between watershed-scale habitat features (e.g., landcover, elevation) and the relative abundance and biomass of species present, however, different species responded similarly to micro-habitat types suggesting that watershed scale factors acted as a filter for community composition. This study demonstrated that valuable insight into restoration can be gained by studying patterns from a broad study of restored systems and that restoration designed around a single species can benefit other species.
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Master's Student Supervision (2010-2017)
Assesing high altitude Andean wetlands using plant community structure : a multivariate analysis and remote sensing approach (2015)
High altitude wetlands of the Central Andes Cordillera in South America are unique ecosystems with valuable ecosystem functions and one of the environments most threatened by climate change. They play a significant role in sustaining endemic biota, in providing the grasslands for herd of alpacas, llamas and vicuñas and by storing water and releasing it during the year to one of the driest regions on the earth, the Atacama Desert. This ecosystem is dependent on groundwater sources, and vegetation regulates the amount of water available during the dry periods. In Chile, the increasing demand for water requires more technical knowledge and research in order to prevent further degradation. The objective of this research is the description of Tarapacá and Atacama regions’ wetlands plant communities, the abiotic factors and human impacts that are more strongly associated with them by multivariate analysis and a remote sensing approach. Chapter 1 is a review of high altitude Andean wetlands and their importance. In Chapter 2, I identified differences in plant communities’ structure. Each region was distinguished by 5 different plant communities according to the vegetation wetland types. Abiotic factors and physical attributes that were more strongly associated with plant communities were the number and width of principal streams found on the wetland and amount of rocks, bare land and percent of organic matter along the vegetation transects. Using field work and remote sensing, in Chapter 3, I performed a spectral discrimination among plant communities using IKONOS-2 and Geoeye-1 high resolution satellites images. They were used to identify which bands and vegetation indices were the most effective for discriminating vegetation classes. Vegetation classes did express different spectral behaviors. The classes with more reflectance variation were mixed grasses with Oxychloe andina, mixed grasses with salt patches and mixed grasses with Zameioscirpus atacamensis, while classes dominated by O. andina, Z. atacamensis and Festuca chrysophylla expressed less variation on the spectral range. General Discriminant Analysis showed that the most important spectral bands and vegetation indices for distinguishing differences between vegetation classes were Band 1-blue, band 4-NIR and the Wide Dynamic Range Vegetation Index.
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Determining the impacts of hydrological drought on endangered Nooksack dace (Rhinichthys cataractae) at the population and individual level : Implications for minimum environmental flow requirements (2013)
Understanding the impacts of hydrological drought is crucial to the conservation of freshwater fishes. In British Columbia, Nooksack dace (Cyprinidae: Rhinichthys cataractae) are an endangered riffle specialist and are threatened by extremely low summer flows. The purpose of this thesis was to explore the impacts of drought on Nooksack dace, whether pool habitats may act as refugia to mitigate these impacts, and to define minimum environmental flow requirements. The first two objectives were addressed using a combination of field survey and experimental manipulations. A reduction in Nooksack dace population size with declining summer flow in Bertrand Creek, and a marked decrease in growth at low discharge in experimental riffles, indicated that low discharge has negative impacts on dace at both population and individual levels. Pool habitats were found to play a minor role in mitigating the negative impacts of hydrological drought (e.g., decreased growth rate), save as a refuge from stranding when riffles dewater. The third objective was addressed using the Instream Flow Incremental Methodology (IFIM). Because this study involved an endangered species an emphasis was placed on evaluating two fundamental assumptions of the methodology. Experimental results for Nooksack dace growth at different depths and velocities provided support for the first assumption, that density-based Habitat Suitability Curves (HSCs) accurately reflect habitat quality, but only for the lower limits of the HSCs. Next, a significant positive relationship between Weighted Usable Area (WUA) and dace biomass was found, supporting the assumption that such a relationship exists. However, this relationship was weak indicating a high degree of uncertainty in how Nooksack dace biomass will respond at high discharges. The IFIM model predicted that habitat availability for Nooksack dace begins to decline most rapidly at discharges of 0.12 m³.s-¹. As there is low confidence in upper ranges of the HSCs this low flow threshold may underestimate declines with discharge, and therefore protection of at least 0.12 m³.s-¹ is considered necessary for the persistence of Nooksack dace individuals and populations. Compared to conventional instream flow criteria, 0.12 m³.s-¹ represents ~10% mean annual discharge which is the threshold for severely degraded habitat.
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Ecological implications of flow-mediated scour events for sockeye salmon alevins (Oncorhynchus nerka) (2012)
Pacific salmon (Oncorhynchus spp.) life cycles involve completion of several developmental stages including the alevin stage. As alevins, sockeye salmon are found within freshwater gravel redds where they utilise yolk sacs for nutrition, growth and development. Flow mediated scour events pose a common threat of destruction to both redds and fragile alevins during a several month period of winter incubation. However, to date, there is very little research on the impacts of early forced emergence of alevins. Using sockeye salmon (Oncorhynchus nerka) as a model, simulated elevated discharge event (SEDE) experiments were conducted to examine the relationship between sockeye alevin development, SEDE exposure and alevin survival. Following five weeks of SEDE experiments, survival rates were found to be significantly correlated to both alevin developmental stage and length of elevated discharge exposure. SEDE experiments were followed by experiments designed to investigate the ecological competence level of alevins following forced early dislodgement. Repeated tests during a five week interval immediately following egg hatch indicated that alevins subjected to SEDE exposure took longer than unexposed alevins to rebury in gravel. Alevins exposed to SEDEs took longer to rebury as they developed, but increased their overall ability to rebury. Neither SEDE exposed or unexposed alevins exhibited abilities to initiate exogenous feeding given forced, early emergence. Survival rates of sockeye salmon alevins both during and after SEDE testing increased significantly with advances of developmental stage. Older, larger alevins also exhibited improved performance in responding to ecological challenges presented in laboratory experiments. Knowledge gained from this research has practical implications for water managers and suggests that: (a) the probability of scour induced mortality of both unhatched eggs and alevins is likely similar up to at least 3 weeks after egg hatch, (b) survival rates and ecological competence of alevins has improved significantly by four weeks following egg hatch, and (c) survival of alevins forced into an epibenthic or water column environment as late as one week before volitional emergence is unlikely to differ greatly from that of unforced emergent fry.
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Hydrogeomorphic disturbance, landscape development and riparian vegetation dynamics of an alluvial, temperate rainforest in the Carmanah River valley, British Columbia, Canada (2012)
The alluvial forest of the Carmanah River valley on the west coast of Vancouver Island, British Columbia, was studied to examine the role of hydrogeomorphic disturbance in perpetuating the shifting-mosaic of habitats within this diverse ecosystem. Field-based research was complemented by a landscape-scale analysis that examined changes in the extent of specific forest types using a 70-year aerial photographic record. Thirty-eight plots containing 4509 trees were sampled for forest structure, composition, age, understory composition, and elevation above the contemporary channel. These field data, including a vegetation chronosequence spanning over 500 years, were used to examine vegetation dynamics. Over the past century, Carmanah River has eroded nearly 30% of the alluvial forest in this study area – 65% over the past 500 years. High magnitude floods result in diminished floodplain forest area by converting forests to channel. This results in a subsequent course of vegetation succession and geomorphic development. Fluvial deposits are colonized by a high density of Alnus rubra accompanied by a subcanopy of Picea sitchensis individuals. As Alnus die off after 60-100 years, Picea increasingly dominates the canopy while Tsuga heterophylla regenerate within the understory. The original cohort of Picea dies off after 300-500 years, which allows Tsuga to dominate old growth terrace forests. Picea or Alnus do not tend to regenerate under these dense canopies and without disturbance Tsuga may remain dominant indefinitely. Understory composition was related to landform age, however species distributions at low elevation floodplain sites were also driven by elevation above thalweg and flood frequency. Light availability was also a significant factor in driving community composition. It appears that understory dynamics were linked to overstory succession and geomorphic development processes, which alter environmental conditions at the understory level. That is, species distributions are driven by dynamic environmental filters, which change as a result of biogeomorphic succession. Mature forest patches tended to persist longer than young forests. The landscape composition reflects a balance between episodes of hydrogeomorphic disturbance and periods of successional development. Increased hydrogeomorphic disturbance rates due to climate change have the capacity to alter the landscape composition resulting in diminished mature forest area.
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Load sharing schemes in multiple induction motor drive applications using volts per hertz control (2012)
Multi induction-motor (IM) drives are commonly used to share a mechanical load in a wide range of industrial applications. In many existing auxiliary applications, the traditional low-cost Volts-per-Hertz (V/F) drives are typically used in speed control mode to simultaneously operate several IMs. In multi-machine load-sharing applications, it is preferred to have number of identical IMs to share the load equally. Under ideal conditions, the identical IMs would operate with equal loading. However, in practice deviations of the load sharing among the IMs is possible due to many factors including variations in internal or external parameters and operating conditions of each individual IM. Such deviations may result in disproportionate sharing of the mechanical load and even overloading one or several machines while some machines may be under-loaded. The basic low-cost variable frequency drives (VFDs) with traditional open-loop V/F control scheme fail to share the load under such conditions.In this Thesis, two new methods are proposed to address the load sharing problems under an internal disturbances (such as rotor resistance variations) and external disturbances (such as wheel slippage due to snow/water/oil etc.). The new methods are shown to be effective in sharing the load under disturbances. Moreover, the proposed methodologies may be readily extended to an arbitrary number of motors driving a common mechanical load, and are easy to implement with traditional/existing low-cost VFDs, which may be advantageous for many existing or legacy applications.
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Stream invertebrates in northwest British Columbia : an assessment of the relative importance of forest harvesting and environment factors at local and landscape scales (2011)
Streams are strongly linked to their terrestrial environments through processes which influence habitat structure and food availability at several, nested scales. While forest practices can affect the hydrological, sedimentation and disturbance regimes, the relationship between community structure and forest practices across broad scales of natural environments is not well understood. In this study, the relative influence of environment and forest harvest attributes on stream community composition was examined in 143 unique 1st to 6th order streams, across a broad geographic scale in northwest B.C. Environment and forest harvest variables explained unique aspects of the community composition using canonical correspondence analysis (CCA), although landscape level environmental variables representing catchment topography and hydrology were selected first using a stepwise procedure. Using partial CCA, 20% of the variation in community structure between sites was explained by environment variables, 12% by forest harvest variables, and 4% was shared between the two sets of variables. The low proportion of shared variance suggested low redundancy between the two sets of variables. Variables describing recent forest harvest (15 years prior to sampling or less) explained unique aspects of the community composition compared to variables describing older forest harvest (more than 15 years prior to sampling), perhaps suggesting partial recovery of the stream community after 15 years. The 143 stream sites were sorted into three LAND USE groups based on the proportion of forest harvest within the catchment basin. Using catchment area as a covariate, relative abundance and rarified taxa richness increased by 30% and 20% respectively, while the proportion of EPT individuals decreased, in catchments with > 15% harvest compared to undisturbed catchments. Distance-based ordination scores (nonmetric multidimensional scaling) changed significantly between the three LAND USE classes of forest harvest on both axes.The effects of forest harvest on streams were confounded with natural environmental gradients. Generally, the catchment basins with >15% harvest were larger, with less topographic relief, more lakes and wetlands, and less rapid drainage characteristics when compared to undisturbed catchments.
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Season-specific survival and growth rates of coastal cutthroat trout across a gradient of stream sizes in southwestern British Columbia (2010)
To have greater predictive abilities for informed resource management guidelines for freshwater species protection and management, we need to increase our limited knowledge of the many aquatic species that inhabit small coastal streams. Coastal cutthroat trout (Oncorhynchus clarkii clarkii) are common to small streams in the Pacific Northwest and are a species of concern or threatened throughout their native range. To address knowledge needs I (1) examined the seasonal variation in survival rates of coastal cutthroat trout across a size gradient of smaller streams in coastal BC; and (2) contrasted 10th year post-harvest seasonal trout body condition and relative abundances, and thermal and physical habitats with pre-harvest and 4th year post-harvest values in small streams. The survival study used a robust mark-recapture design stratified seasonally to estimate monthly survival rates; and the streamside harvest study used a multi-year, replicated, before-after-control-impact design. Within the size range of smaller streams studied (n = 7), availability of aquatic habitat (i.e., residual depth) at low-flows was the best predictor of monthly survival rates (p = 0.011), supporting my hypothesis that greater availability of habitat confers higher survival in trout. In addition, a fitted curve suggested an asymptotic relation between water depth and survival rates; where beyond 25 cm of water, greater depth did not confer greater benefits to trout survival. Survival estimates also showed that the summer season had the lowest monthly survival rates across all streams in our study area. Post-harvest effects were not detected in trout relative abundances in the 10th year; however body condition had significantly (p
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Recent Tri-Agency Grants
The following is a selection of grants for which the faculty member was principal investigator or co-investigator. Currently, the list only covers Canadian Tri-Agency grants from years 2013/14-2016/17 and excludes grants from any other agencies.
- Source stream (headwater) protection from forest practices: what are the costs and benefits, and how best to do it? (SOSTPRO) - Natural Sciences and Engineering Research Council of Canada (NSERC) - Joint Call for the Water Joint Programming Initiative (JPI) (2016/2017)
- Cumulative effects in a riverscape across scales: thresholds of disturbance in ecosystem integrity - Natural Sciences and Engineering Research Council of Canada (NSERC) - Strategic Partnership Grants for Projects (2014/2015)
- Population and community consequences of cross-ecosystem resource subsidies - Natural Sciences and Engineering Research Council of Canada (NSERC) - Discovery Grants Program - Individual (2013/2014)
- NSERC Canadian Network for Aquatic Ecosystem Services (CNAES): Project 2.2 - Natural Sciences and Engineering Research Council of Canada (NSERC) - Strategic Network Grant (2013/2014)
News Releases in the past 2 years
Publications
- Biological Diversity in Headwater Streams (2019)
Water - Chlorpyrifos interacts with other agricultural stressors to alter stream communities in laboratory microcosms (2018)
Chara-Serna, Ana M. and Richardson, John S.
Ecological Applications 28 (1) 162-176 - Expanding Resilience Comparisons to Address Management Needs: A Response to Ingrisch and Bahn (2018)
Yeung, Alex C. Y. and Richardson, John S.
Trends in Ecology & Evolution 33 (9) 647-649 - Experimental test of water, nutrients, and microclimate on leaf litter mass loss in headwater riparian forests (2018)
Tonya L. Ramey and John S. Richardson
Ecosphere 9 (10) e02478 - Relations of interannual differences in stream litter breakdown with discharge: bioassessment implications (2018)
Alex C. Y. Yeung and Jordan L. Musetta-Lambert and David P. Kreutzweiser and Paul K. Sibley and John S. Richardson
Ecosphere 9 (9) e02423 - The energetic consequences of habitat structure for forest stream salmonids (2018)
Naman, Sean M. and Rosenfeld, Jordan S. and Kiffney, Peter M. and Richardson, John S.
Journal of Animal Ecology 87 (5) 1383-1394 - Assessing the long-term ecological effects of riparian management practices on headwater streams in a coastal temperate rainforest (2017)
Yeung, Alex C. Y. and Lecerf, Antoine and Richardson, John S.
Forest Ecology and Management 384 100-109 - Does leaf litter from invasive plants contribute the same support of a stream ecosystem function as native vegetation (2017)
Kuglerova, Lenka and Garcia, Liliana and Pardo, Isabel and Mottiar, Yaseen and Richardson, John S.
Ecosphere 8 (4) - Effects of landuse intensification on stream basal resources and invertebrate communities (2017)
Garcia, Liliana and Cross, Wyatt F. and Pardo, Isabel and Richardson, John S.
Freshwater Science 36 (3) 609-625 - Habitat-specific production of aquatic and terrestrial invertebrate drift in small forest streams: implications for drift-feeding fish (2017)
Naman, Sean M. and Rosenfeld, Jordan S. and Third, Laura C. and Richardson, John S.
Canadian Journal of Fisheries and Aquatic Sciences 74 (8) 1208-1217 - Management perspectives on Aqua incognita: Connectivity and cumulative effects of small natural and artificial streams in boreal forests (2017)
Kuglerova, Lenka and Hasselquist, Eliza Maher and Richardson, John S. and Sponseller, Ryan A. and Kreutzweiser, David P. and Laudon, Hjalmar
Hydrological Processes 31 (23) 4238-4244 - Moderate nutrient enrichment affects algal and detritus pathways differently in a temperate rainforest stream (2017)
Garcia, Liliana and Pardo, Isabel and Cross, Wyatt F. and Richardson, John S.
Aquatic Sciences 79 (4) 941-952 - Sediment addition reduces the importance of predation on ecosystem functions in experimental stream channels (2017)
Louhi, Pauliina and Richardson, John S. and Muotka, Timo
Canadian Journal of Fisheries and Aquatic Sciences 74 (1) 32-40 - Species traits and channel architecture mediate flow disturbance impacts on invertebrate drift (2017)
Naman, Sean M. and Rosenfeld, Jordan S. and Richardson, John S. and Way, Jesse L.
Freshwater Biology 62 (2) 340-355 - Terrestrial Invertebrates in the Riparian Zone: Mechanisms Underlying Their Unique Diversity (2017)
Ramey, Tonya L. and Richardson, John S.
Bioscience 67 (9) 808-819 - A test of the effects of timing of a pulsed resource subsidy on stream ecosystems (2016)
Sato, Takuya and El-Sabaawi, Rana W. and Campbell, Kirsten and Ohta, Tamihisa and Richardson, John S.
Journal of Animal Ecology 85 (5) 1136-1146 - Causes and consequences of invertebrate drift in running waters: from individuals to populations and trophic fluxes (2016)
Naman, Sean M. and Rosenfeld, Jordan S. and Richardson, John S.
Canadian Journal of Fisheries and Aquatic Sciences 73 (8) 1292-1305 - Getting quantitative about consequences of cross-ecosystem resource subsidies on recipient consumers (2016)
Richardson, John S. and Wipfli, Mark S.
Canadian Journal of Fisheries and Aquatic Sciences 73 (11) 1609-1615 - Some Conceptual and Operational Considerations when Measuring 'Resilience': A Response to Hodgson et al. (2016)
Yeung, Alex C. Y. and Richardson, John S.
Trends in Ecology & Evolution 31 (1) 2-3 - Distribution pattern of coniferous seedlings after a partial harvest along a creek in a Canadian Pacific northwest forest (2015)
Minami, Yoshi and Oba, Mai and Kojima, Satoru and Richardson, John S.
Journal of Forest Research 20 (3) 328-336 - Resource subsidy flows across freshwater-terrestrial boundaries and influence on processes linking adjacent ecosystems (2015)
Richardson, John S. and Sato, Takuya
Ecohydrology 8 (3) 406-415 - Small stonefly predators affect microbenthic and meiobenthic communities in stream leaf packs (2015)
Majdi, Nabil and Traunspurger, Walter and Richardson, John S. and Lecerf, Antoine
Freshwater Biology 60 (9) 1930-1943 - Warming alters food web-driven changes in the CO2 flux of experimental pond ecosystems (2015)
Atwood, T. B. and Hammill, E. and Kratina, P. and Greig, H. S. and Shurin, J. B. and Richardson, J. S.
Biology Letters 11 (12) - A cross-continental comparison of stream invertebrate community assembly to assess convergence in forested headwater streams (2014)
Garcia, Liliana and Pardo, Isabel and Richardson, John S.
Aquatic Sciences 76 (1) 29-40 - A test of the umbrella species approach in restored floodplain ponds (2014)
Branton, Margaret A. and Richardson, John S.
Journal of Applied Ecology 51 (3) 776-785 - Artificial light as a disturbance to light-naive streams (2014)
Perkin, Elizabeth K. and Hoelker, Franz and Tockner, Klement and Richardson, John S.
Freshwater Biology 59 (11) 2235-2244 - Competitive displacement alters top-down effects on carbon dioxide concentrations in a freshwater ecosystem (2014)
Atwood, Trisha B. and Hammill, Edd and Srivastava, Diane S. and Richardson, John S.
Oecologia 175 (1) 353-361 - Effects of riparian forest harvest on streams: a meta-analysis (2014)
Richardson, John S. and Beraud, Salome
Journal of Applied Ecology 51 (6) 1712-1721 - Hydrological drought and the role of refugia in an endangered riffle-dwelling fish, Nooksack dace (Rhinichthys cataractae ssp.) (2014)
Avery-Gomm, Stephanie and Rosenfeld, Jordan S. and Richardson, John S. and Pearson, Michael
Canadian Journal of Fisheries and Aquatic Sciences 71 (11) 1625-1634 - Leaf-litter leachate and light interactively enhance accrual of stream biofilms (2014)
Lovatt, Christina and Kominoski, John S. and Sakamaki, Takashi and Macleod, Brandon and Richardson, John S.
Fundamental and Applied Limnology 184 (4) 297-306 - Principles for ensuring healthy and productive freshwater ecosystems that support sustainable fisheries (2014)
Lapointe, Nicolas W. R. and Cooke, Steven J. and Imhof, Jack G. and Boisclair, Daniel and Casselman, John M. and Curry, R. Allen and Langer, Otto E. and McLaughlin, Robert L. and Minns, Charles K. and Post, John R. and Power, Michael and Rasmussen, Joseph B. and Reynolds, John D. and Richardson, John S. and Tonn, William M.
Environmental Reviews 22 (2) 110-134 - Trophic-level dependent effects on CO2 emissions from experimental stream ecosystems (2014)
Atwood, Trisha B. and Hammill, Edd and Richardson, John S.
Global Change Biology 20 (11) 3386-3396 - Channel and landscape dynamics in the alluvial forest mosaic of the Carmanah River valley, British Columbia, Canada (2013)
Little, Patrick J. and Richardson, John S. and Alila, Younes
Geomorphology 202 86-100 - Modeling the role of stage-structured agonistic interactions in ontogenetic habitat shifts (2013)
Martin, Amanda E. and Hoover, Trent M. and Richardson, John S.
Behavioral Ecology 24 (2) 355-365 - Nonlinear variation of stream-forest linkage along a stream-size gradient: an assessment using biogeochemical proxies of in-stream fine particulate organic matter (2013)
Sakamaki, Takashi and Richardson, John S.
Journal of Applied Ecology 50 (4) 1019-1027 - Predator-induced reduction of freshwater carbon dioxide emissions (2013)
Atwood, Trisha B. and Hammill, Edd and Greig, Hamish S. and Kratina, Pavel and Shurin, Jonathan B. and Srivastava, Diane S. and Richardson, John S.
Nature Geoscience 6 (3) 191-194 - Quantitative gradient of subsidies reveals a threshold in community-level trophic cascades (2013)
Klemmer, Amanda J. and Richardson, John S.
Ecology 94 (9) 1920-1926 - Stage-specific interactions between dominant consumers within a small stream ecosystem: direct and indirect consequences (2013)
Bondar, Carin A. and Richardson, John S.
Freshwater Science 32 (1) 183-192 - Current and Historical Drivers of Landscape Genetic Structure Differ in Core and Peripheral Salamander Populations (2012)
Dudaniec, Rachael Y. and Spear, Stephen F. and Richardson, John S. and Storfer, Andrew
Plos One 7 (5) - Emulation of natural disturbance (END) for riparian forest management: synthesis and recommendations (2012)
Sibley, Paul K. and Kreutzweiser, David P. and Naylor, Brian J. and Richardson, John S. and Gordon, Andrew M.
Freshwater Science 31 (1) 258-264 - Fine sediment on leaves: shredder removal of sediment does not enhance fungal colonisation (2012)
Sanpera-Calbet, Isis and Chauvet, Eric and Richardson, John S.
Aquatic Sciences 74 (3) 527-538 - HABITAT ASSOCIATIONS OF THE COASTAL GIANT SALAMANDER (DICAMPTODON TENEBROSUS) AT ITS NORTHERN RANGE LIMIT (2012)
Dudaniec, Rachael Y. and Richardson, John S.
Herpetological Conservation and Biology 7 (1) 1-15 - How did fixed-width buffers become standard practice for protecting freshwaters and their riparian areas from forest harvest practices? (2012)
Richardson, John S. and Naiman, Robert J. and Bisson, Peter A.
Freshwater Science 31 (1) 232-238 - Interactive Field Site Visits Can Help Students Translate Scientific Studies into Contextual Understanding (2012)
Burt, J. M. and Donaldson, M. R. and Hruska, K. A. and Hinch, S. G. and Richardson, J. S.
Fisheries 37 (7) 315-319 - Introduction and a theoretical basis for using disturbance by forest management activities to sustain aquatic ecosystems (2012)
Kreutzweiser, David P. and Sibley, Paul K. and Richardson, John S. and Gordon, Andrew M.
Freshwater Science 31 (1) 224-231 - Invertebrate feeding and emergence timing vary among streams along a gradient of riparian forest composition (2012)
Kominoski, John S. and Larranaga, Santiago and Richardson, John S.
Freshwater Biology 57 (4) 759-772 - Invertebrate feeding and emergence timing vary among streams along a gradient of riparian forest composition (vol 57, pg 759, 2012) (2012)
Kominoski, John S. and Larranaga, Santiago and Richardson, John S.
Freshwater Biology 57 (7) 1532-1534 - Leaf quality influences invertebrate colonization and drift in a temperate rainforest stream (2012)
Garcia, Liliana and Richardson, John S. and Pardo, Isabel
Canadian Journal of Fisheries and Aquatic Sciences 69 (10) 1663-1673 - Natural disturbance and forest management in riparian zones: comparison of effects at reach, catchment, and landscape scales (2012)
Moore, R. Dan and Richardson, John S.
Freshwater Science 31 (1) 239-247 - Trophic Interactions Between Insects and Stream-Associated Amphibians in Steep, Cobble-Bottom Streams of the Pacific Coast of North America. (2012)
Atwood, Trisha and Richardson, John S.
Insects 3 (2) 432-441 - Warming, eutrophication, and predator loss amplify subsidies between aquatic and terrestrial ecosystems (2012)
Greig, Hamish S. and Kratina, Pavel and Thompson, Patrick L. and Palen, Wendy J. and Richardson, John S. and Shurin, Jonathan B.
Global Change Biology 18 (2) 504-514 - Assessing the functional importance of large-bodied invertebrates in experimental headwater streams (2011)
Lecerf, Antoine and Richardson, John S.
Oikos 120 (6) 950-960 - Assessing the Value of the Umbrella-Species Concept for Conservation Planning with Meta-Analysis (2011)
Branton, Margaret and Richardson, John S.
Conservation Biology 25 (1) 9-20 - Biogeochemical properties of fine particulate organic matter as an indicator of local and catchment impacts on forested streams (2011)
Sakamaki, Takashi and Richardson, John S.
Journal of Applied Ecology 48 (6) 1462-1471 - Contrasting effects of cross-ecosystem subsidies and predation on benthic invertebrates in two Pacific coastal streams (2011)
Zhang, Yixin and Richardson, John S.
Aquatic Sciences 73 (1) 53-62 - Riparian canopy type, management history, and successional stage control fluxes of plant litter to streams (2011)
Hoover, Trent M. and Pinto, Xavier and Richardson, John S.
Canadian Journal of Forest Research-Revue Canadienne De Recherche Forestiere 41 (7) 1394-1404 - Riparian forest composition affects stream litter decomposition despite similar microbial and invertebrate communities (2011)
Kominoski, John S. and Marczak, Laurie B. and Richardson, John S.
Ecology 92 (1) 151-159 - The influence of artificial light on stream and riparian ecosystems: questions, challenges, and perspectives (2011)
Perkin, Elizabeth K. and Hoelker, Franz and Richardson, John S. and Sadler, Jon P. and Wolter, Christian and Tockner, Klement
Ecosphere 2 (11) - Are forested buffers an effective conservation strategy for riparian fauna? An assessment using meta-analysis (2010)
Marczak, Laurie B. and Sakamaki, Takashi and Turvey, Shannon L. and Deguise, Isabelle and Wood, Sylvia L. R. and Richardson, John S.
Ecological Applications 20 (1) 126-134 - BIODIVERSITY-ECOSYSTEM FUNCTION RESEARCH: INSIGHTS GAINED FROM STREAMS (2010)
Lecerf, A. and Richardson, J. S.
River Research and Applications 26 (1) 45-54 - Do riparian zones qualify as critical habitat for endangered freshwater fishes? (2010)
Richardson, John S. and Taylor, Eric and Schluter, Dolph and Pearson, Mike and Hatfield, Todd
Canadian Journal of Fisheries and Aquatic Sciences 67 (7) 1197-1204 - Does water velocity influence optimal escape behaviors in stream insects? (2010)
Hoover, Trent M. and Richardson, John S.
Behavioral Ecology 21 (2) 242-249 - Evidence for ecosystem engineering in a lentic habitat by tadpoles of the western toad (2010)
Wood, Sylvia L. R. and Richardson, John S.
Aquatic Sciences 72 (4) 499-508 - Experimental increases and reductions of light to streams: effects on periphyton and macroinvertebrate assemblages in a coniferous forest landscape (2010)
Gjerlov, Charlotte and Richardson, John S.
Hydrobiologia 652 (1) 195-206 - Litter decomposition can detect effects of high and moderate levels of forest disturbance on stream condition (2010)
Lecerf, Antoine and Richardson, John S.
Forest Ecology and Management 259 (12) 2433-2443 - New Microsatellite Markers for Examining Genetic Variation in Peripheral and Core Populations of the Coastal Giant Salamander (Dicamptodon tenebrosus) (2010)
Dudaniec, Rachael Y. and Storfer, Andrew and Spear, Stephen F. and Richardson, John S.
Plos One 5 (12) - Organic matter inputs into headwater streams of southwestern British Columbia as a function of riparian reserves and time since harvesting (2010)
Kiffney, Peter M. and Richardson, John S.
Forest Ecology and Management 260 (11) 1931-1942 - RESOURCE SUBSIDIES ACROSS THE LAND-FRESHWATER INTERFACE AND RESPONSES IN RECIPIENT COMMUNITIES (2010)
Richardson, John S. and Zhang, Yixin and Marczak, Laurie B.
River Research and Applications 26 (1) 55-66 - Transport and settlement of organic matter in small streams (2010)
Hoover, Trent M. and Marczak, Laurie B. and Richardson, John S. and Yonemitsu, Noboru
Freshwater Biology 55 (2) 436-449 - Watershed Effects on Chemical Properties of Sediment and Primary Consumption in Estuarine Tidal Flats: Importance of Watershed Size and Food Selectivity by Macrobenthos (2010)
Sakamaki, Takashi and Shum, Jennifer Y. T. and Richardson, John S.
Ecosystems 13 (2) 328-337 - Catchment-scale effects of forestry practices on benthic invertebrate communities in Pacific coastal streams (2009)
Zhang, Yixin and Richardson, John S. and Pinto, Xavier
Journal of Applied Ecology 46 (6) 1292-1303 - Coarse particulate organic matter dynamics in small streams: towards linking function to physical structure (2009)
Richardson, John S. and Hoover, Trent M. and Lecerf, Antoine
Freshwater Biology 54 (10) 2116-2126 - Dietary responses of tidal flat macrobenthos to reduction of benthic microalgae: a test for potential use of allochthonous organic matter (2009)
Sakamaki, Takashi and Richardson, John S.
Marine Ecology-Progress Series 386 107-113 - Effects of ontogenetic stage and density on the ecological role of the signal crayfish (Pacifastacus leniusculus) in a coastal Pacific stream (2009)
Bondar, Carin A. and Richardson, John S.
Journal of the North American Benthological Society 28 (2) 294-304 - Impact of sediment and nutrient inputs on growth and survival of tadpoles of the Western Toad (2009)
Wood, Sylvia L. R. and Richardson, John S.
Freshwater Biology 54 (5) 1120-1134 - Movement behaviour of adult western toads in a fragmented, forest landscape (2009)
Deguise, Isabelle and Richardson, John S.
Canadian Journal of Zoology-Revue Canadienne De Zoologie 87 (12) 1184-1194 - Prevalence of the chytrid fungus (Batrachochytrium dendrobatidis) in western toads in Southwestern British Columbia, Canada. (2009)
Deguise, Isabelle and Richardson, John S.
Northwestern Naturalist 90 (1) 35-38 - Riparian vegetation change in upstream and downstream reaches of three temperate rivers dammed for hydroelectric generation in British Columbia, Canada (2009)
Mallik, Azim U. and Richardson, John S.
Ecological Engineering 35 (5) 810-819 - Setting conservation targets for freshwater ecosystems in forested catchments. (2009)
Richardson, John S. and Thompson, Ross M.
Conservation Biology Series (Cambridge) 16 244-263 - Aquatic arthropods and forestry: effects of large-scale land use on aquatic systems in Nearctic temperate regions (2008)
Richardson, John S.
Canadian Entomologist 140 (4) 495-509 - Effects of small rivers on chemical properties of sediment and diets for primary consumers in estuarine tidal flats (2008)
Sakamaki, Takashi and Richardson, John S.
Marine Ecology-Progress Series 360 13-24 - Growth and development rates in a riparian spider are altered by asynchrony between the timing and amount of a resource subsidy (2008)
Marczak, Laurie B. and Richardson, John S.
Oecologia 156 (2) 249-258 - Retention, breakdown, and biological utilisation of deciduous tree leaves in an estuarine tidal flat of southwestern British Columbia, Canada (2008)
Sakamaki, Takashi and Richardson, John S.
Canadian Journal of Fisheries and Aquatic Sciences 65 (1) 38-46 - A synthesis of the ecology of headwater streams and their riparian zones in temperate forests (2007)
Richardson, John S. and Danehy, Robert J.
Forest Science 53 (2) 131-147 - Comparisons of the colonisation by invertebrates of three species of wood, alder leaves, and plastic "Leaves" in a temperate stream (2007)
Hofer, Nancy and Richardson, John S.
International Review of Hydrobiology 92 (6) 647-655 - Ecological linkages between headwaters and downstream ecosystems: Transport of organic matter, invertebrates, and wood down headwater channels (2007)
Wipfli, Mark S. and Richardson, John S. and Naiman, Robert J.
Journal of the American Water Resources Association 43 (1) 72-85 - Effects of logging second-growth forests on headwater populations of coastal cutthroat trout: A 6-year, multistream, before-and-after field experiment (2007)
De Groot, Jennifer D. and Hinch, Scott G. and Richardson, John S.
Transactions of the American Fisheries Society 136 (1) 211-226 - Meta-analysis: Trophic level, habitat, and productivity shape the food web effects of resource subsidies (2007)
Marczak, Laurie B. and Thompson, Ross M. and Richardson, John S.
Ecology 88 (1) 140-148 - Riparian forest harvesting and its influence on benthic communities of small streams of sub-boreal British Columbia (2007)
Melody, K. Jill and Richardson, John S.
Canadian Journal of Forest Research-Revue Canadienne De Recherche Forestiere 37 (5) 907-918 - Spiders and subsidies: results from the riparian zone of a coastal temperate rainforest (2007)
Marczak, Laurie B. and Richardson, John S.
Journal of Animal Ecology 76 (4) 687-694 - Trophic interception: how a boundary-foraging organism influences cross-ecosystem fluxes (2007)
Marczak, Laurie B. and Hoover, Trent M. and Richardson, John S.
Oikos 116 (10) 1651-1662 - Unidirectional prey-predator facilitation: apparent prey enhance predators' foraging success on cryptic prey (2007)
Zhang, Yixin and Richardson, John S.
Biology Letters 3 (3) 348-351 - Agonistic behaviours and movement in the signal crayfish, Pacifastacus leniusculus: can dominance interactions influence crayfish size-class distributions in streams? (2006)
Harrison, Megan L. and Hoover, Trent M. and Richardson, John S.
Canadian Journal of Zoology-Revue Canadienne De Zoologie 84 (10) 1495-1504 - An experimental test of the effects of food resources and hydraulic refuge on patch colonization by stream macroinvertebrates during spates (2006)
Negishi, JN and Richardson, JS
Journal of Animal Ecology 75 (1) 118-129 - Flow-substrate interactions create and mediate leaf litter resource patches in streams (2006)
Hoover, TM and Richardson, JS and Yonemitsu, N
Freshwater Biology 51 (3) 435-447 - Life history phenology and sediment size association of the dragonfly Cordulegaster dorsalis (Odonata : Cordulegastridae) in an ephemeral habitat in southwestern British Columbia (2006)
Marczak, Laurie B. and Richardson, John S. and Classen, Marie-Claire
Canadian Field-Naturalist 120 (3) 347-350 - Risk-sensitive foraging by juvenile signal crayfish (Pacifastacus leniusculus) (2006)
Bondar, C. A. and Zeron, K. and Richardson, John S.
Canadian Journal of Zoology-Revue Canadienne De Zoologie 84 (11) 1693-1697 - Benthic assemblage variation among channel units in high-gradient streams on Vancouver Island, British Columbia (2005)
Halwas, KL and Church, M and Richardson, JS
Journal of the North American Benthological Society 24 (3) 478-494 - Complex interactions of light, nutrients and consumer density in a stream periphyton-grazer (tailed frog tadpoles) system (2005)
Mallory, MA and Richardson, JS
Journal of Animal Ecology 74 (6) 1020-1028 - Does trophic position of the omnivorous signal crayfish (Pacifastacus leniusculus) in a stream food web vary with life history stage or density? (2005)
Bondar, CA and Bottriell, K and Zeron, K and Richardson, JS
Canadian Journal of Fisheries and Aquatic Sciences 62 (11) 2632-2639 - Effects of nonylphenol on rates of tail resorption and metamorphosis in Rana catesbeiana tadpoles (2005)
Christensen, JR and Richardson, JS and Bishop, CA and Pauli, B and Elliott, J
Journal of Toxicology and Environmental Health-Part a-Current Issues 68 (7) 557-572 - Modelling organic matter dynamics in headwater streams of south-western British Columbia, Canada (2005)
Karlsson, OM and Richardson, JS and Kiffney, PA
Ecological Modelling 183 (4) 463-476 - Movement patterns and relative abundance of coastal tailed frogs in clearcuts and mature forest stands (2005)
Matsuda, BM and Richardson, JS
Canadian Journal of Forest Research-Revue Canadienne De Recherche Forestiere 35 (5) 1131-1138 - Organic matter dynamics in small streams of the Pacific Northwest (2005)
Richardson, JS and Bilby, RE and Bondar, CA
Journal of the American Water Resources Association 41 (4) 921-934 - Riparian communities associated with Pacific Northwest headwater streams: Assemblages, processes, and uniqueness (2005)
Richardson, JS and Naiman, RJ and Swanson, FJ and Hibbs, DE
Journal of the American Water Resources Association 41 (4) 935-947 - Detritus processing, ecosystem engineering and benthic diversity: a test of predator-omnivore interference (2004)
Zhang, YX and Richardson, JS and Negishi, JN
Journal of Animal Ecology 73 (4) 756-766 - Effects of pH and dilution on African clawed frog (Xenopus laevis) sperm motility (2004)
Christensen, JR and Pauli, BD and Richardson, JS and Bishop, CA and Elliott, J
Canadian Journal of Zoology-Revue Canadienne De Zoologie 82 (4) 555-563 - 2.0.co;2" target="_blank">Establishing light as a causal mechanism structuring stream communities in response to experimental manipulation of riparian buffer width (2004)
Kiffney, PM and Richardson, JS and Bull, JP
Journal of the North American Benthological Society 23 (3) 542-555 - Litter breakdown and invertebrate association with three types of leaves in a temperate rainforest stream (2004)
Richardson, JS and Shaughnessy, CR and Harrison, PG
Archiv Fur Hydrobiologie 159 (3) 309-325 - Patchy resources in a heterogeneous environment: effects of leaf litter and forest cover on colonisation patterns of invertebrates in a British Columbian stream (2004)
Gjerlov, C and Richardson, JS
Archiv Fur Hydrobiologie 161 (3) 307-327 - Responses of invertebrates and algae of a boreal coniferous forest stream to experimental manipulation of leaf litter inputs and shading (2004)
Melody, KJ and Richardson, JS
Hydrobiologia 519 (1-3) 197-206 - Validation of an amphibian sperm inhibition toxicological test method using zinc (2004)
Christensen, JR and Bishop, CA and Richardson, JS and Pauli, B and Elliott, J
Environmental Toxicology and Chemistry 23 (12) 2950-2955 - Communities of aquatic insects of old-growth and clearcut coastal headwater streams of varying flow persistence (2003)
Price, K and Suski, A and McGarvie, J and Beasley, B and Richardson, JS
Canadian Journal of Forest Research-Revue Canadienne De Recherche Forestiere 33 (8) 1416-1432 - Do riparian buffer strips mitigate the impacts of clearcutting on small mammals? (2003)
Cockle, KL and Richardson, JS
Biological Conservation 113 (1) 133-140 - Headwater and channel network systems: Understanding processes and downstream linkages of fish-less streams to fish-bearing streams. (2003)
Gomi, T. and Sidle, R. C. and Richardson, J. S. and Moore, R. D.
American Fisheries Society Annual Meeting 133 202 - Impacts of marine-derived nutrients on stream ecosystem functioning (2003)
Zhang, YX and Negishi, JN and Richardson, JS and Kolodziejczyk, R
Proceedings of the Royal Society of London Series B-Biological Sciences 270 (1529) 2117-2123 - Progress towards understanding the structure, function, and ecological significance of small stream channels and their riparian zones (2003)
Moore, RD and Richardson, JS
Canadian Journal of Forest Research-Revue Canadienne De Recherche Forestiere 33 (8) 1349-1351 - Responses of organic matter and macroinvertebrates to placements of boulder clusters in a small stream of southwestern British Columbia, Canada (2003)
Negishi, JN and Richardson, JS
Canadian Journal of Fisheries and Aquatic Sciences 60 (3) 247-258 - Responses of periphyton and insects to experimental manipulation of riparian buffer width along forest streams (2003)
Kiffney, PM and Richardson, JS and Bull, JP
Journal of Applied Ecology 40 (6) 1060-1076 - Aquatic invertebrates. (2002)
Richardson, John S. and Jackson, Michael J.
Handbook of ecological restoration. Volume 1: principles of restoration. 300-323 - Effects of food and cover on the growth, survival, and movement of cutthroat trout (Oncorhynchus clarki) in coastal streams (2002)
Boss, SM and Richardson, JS
Canadian Journal of Fisheries and Aquatic Sciences 59 (6) 1044-1053 - Microbial utilization of dissolved organic carbon leached from riparian litterfall (2002)
McArthur, MD and Richardson, JS
Canadian Journal of Fisheries and Aquatic Sciences 59 (10) 1668-1676 - Predation risk and competition effects on the life-history characteristics of larval Oregon spotted frog and larval red-legged frog (2002)
Barnett, HK and Richardson, JS
Oecologia 132 (3) 436-444 - Understanding processes and downstream linkages of headwater systems (2002)
Gomi, T and Sidle, RC and Richardson, JS
Bioscience 52 (10) 905-916 - Community responses to experimental food depletion: resource tracking by stream invertebrates (2001)
Rowe, L and Richardson, JS
Oecologia 129 (3) 473-480 - Direct and indirect effects of sediment pulse duration on stream invertebrate assemblages and rainbow trout (Oncorhynchus mykiss) growth and survival (2001)
Shaw, EA and Richardson, JS
Canadian Journal of Fisheries and Aquatic Sciences 58 (11) 2213-2221 - Implications of seasonal variation for biomonitoring with predictive models in the Fraser River catchment, British Columbia (2001)
Reece, PF and Reynoldson, TB and Richardson, JS and Rosenberg, DM
Canadian Journal of Fisheries and Aquatic Sciences 58 (7) 1411-1418 - Interactions among nutrients, periphyton, and invertebrate and vertebrate (Ascaphus truei) grazers in experimental channels (2001)
Kiffney, PM and Richardson, JS
Copeia (2) 422-429 - Life cycle phenology of common detritivores from a temperate rainforest stream (2001)
Richardson, JS
Hydrobiologia 455 87-95 - Benthic macroinvertebrate assemblages of coastal and continental streams and large rivers of southwestern British Columbia, Canada (2000)
Reece, PF and Richardson, JS
Hydrobiologia 439 (1-3) 77-89 - Fish communities of the lower Fraser River (Canada) and a 21-year contrast (2000)
Richardson, JS and Lissimore, TJ and Healey, MC and Northcote, TG
Environmental Biology of Fishes 59 (2) 125-140 - Fluvial and epilithic organic matter dynamics in headwater streams of southwestern British Columbia, Canada (2000)
Kiffney, PM and Richardson, JS and Feller, MC
Archiv Fur Hydrobiologie 149 (1) 109-129 - Macroinvertebrate community structure along gradients of hydraulic and sedimentary conditions in a large gravel-bed river (2000)
Rempel, LL and Richardson, JS and Healey, MC
Freshwater Biology 45 (1) 57-73 - 2.3.co;2" target="_blank">Responses of a macroinvertebrate community from a pristine, southern British Columbia, Canada, stream to metals in experimental mesocosms (2000)
Richardson, JS and Kiffney, PM
Environmental Toxicology and Chemistry 19 (3) 736-743 - Flow refugia for benthic macroinvertebrates during flooding of a large river (1999)
Rempel, LL and Richardson, JS and Healey, MC
Journal of the North American Benthological Society 18 (1) 34-48 - Spatial autocorrelation and fish production in freshwaters: a comment on Randall et al. (1995) (1999)
Nash, CH and Richardson, JS and Hinch, SG
Canadian Journal of Fisheries and Aquatic Sciences 56 (9) 1696-1699 - Headwater amphibians and forestry in British Columbia: Pacific giant salamanders and tailed frogs (1998)
Richardson, JS and Neill, WE
Northwest Science 72 122-123 - Decomposition rates of purple loosestrife (Lythrum salicaria) and Lyngbyei's sedge (Carex lyngbyei) in the Fraser River estuary (1997)
Grout, JA and Levings, CD and Richardson, JS
Estuaries 20 (1) 96-102 - N and P limitation of benthos abundance in the Nechako River, British Columbia (1997)
Perrin, CJ and Richardson, JS
Canadian Journal of Fisheries and Aquatic Sciences 54 (11) 2574-2583 - The role of stoneflies in enhancing growth of trout: a test of the importance of predator-predator facilitation within a stream community (1997)
Soluk, DA and Richardson, JS
Oikos 80 (2) 214-219 - A healthy Fraser River? How will we know when we achieve this state? (1996)
Richardson, John S. and Healey, Michael C.
Journal of Aquatic Ecosystem Health 5 (2) 107-115 - Changes in the productivity base and fish populations of the Lower Fraser River (Canada) associated with historical changes in human occupation. (1996)
Healey, M.C. and Richardson, J.S.
Archiv fuer Hydrobiologie Supplement 113 (1-4) 279-290 - SHREDDER-COLLECTOR FACILITATION IN STREAM DETRITAL FOOD WEBS - IS THERE ENOUGH EVIDENCE (1995)
HEARD, SB and RICHARDSON, JS
Oikos 72 (3) 359-366 - EFFECTS OF THE BACTERIAL INSECTICIDE BACILLUS-THURINGIENSIS VAR KURSTAKI (BTK) ON A STREAM BENTHIC COMMUNITY (1994)
RICHARDSON, JS and PERRIN, CJ
Canadian Journal of Fisheries and Aquatic Sciences 51 (5) 1037-1045 - COARSE PARTICULATE DETRITUS DYNAMICS IN SMALL, MONTANE STREAMS OF SOUTHWESTERN BRITISH-COLUMBIA (1992)
RICHARDSON, JS
Canadian Journal of Fisheries and Aquatic Sciences 49 (2) 337-346 - FOOD, MICROHABITAT, OR BOTH - MACROINVERTEBRATE USE OF LEAF ACCUMULATIONS IN A MONTANE STREAM (1992)
RICHARDSON, JS
Freshwater Biology 27 (2) 169-176 - STREAM PERIPHYTON AND BENTHIC INSECT RESPONSES TO ADDITIONS OF TREATED AND MINE DRAINAGE IN A CONTINUOUS-FLOW ON-SITE MESOCOSM (1992)
PERRIN, CJ and WILKES, B and RICHARDSON, JS
Environmental Toxicology and Chemistry 11 (11) 1513-1525 - INDIRECT EFFECTS OF DETRITUS MANIPULATIONS IN A MONTANE STREAM (1991)
RICHARDSON, JS and NEILL, WE
Canadian Journal of Fisheries and Aquatic Sciences 48 (5) 776-783 - LAKE OUTLETS AND THE DISTRIBUTION OF FILTER FEEDERS - AN ASSESSMENT OF HYPOTHESES (1991)
RICHARDSON, JS and MACKAY, RJ
Oikos 62 (3) 370-380 - SEASONAL FOOD LIMITATION OF DETRITIVORES IN A MONTANE STREAM - AN EXPERIMENTAL TEST (1991)
RICHARDSON, JS
Ecology 72 (3) 873-887 - STREAM PERIPHYTON AND BENTHIC INSECT RESPONSES TO ADDITIONS OF TREATED ACID MINE DRAINAGE IN A CONTINUOUS-FLOW ON-SITE MESOCOSM (1991)
PERRIN C J and WILKES B and RICHARDSON J S
Canadian Technical Report of Fisheries and Aquatic Sciences 1774 (1-2) 555-576 - DENSITY DEPENDENT EFFECTS OF A DETRITIVORE IN A FOOD-LIMITED ENVIRONMENT (1990)
RICHARDSON J S
Bulletin of the Ecological Society of America 71 (2 SUP) 302 - BIOSYSTEMATICS OF EOCOSMOECUS, A NEW NEARCTIC CADDISFLY GENUS (TRICHOPTERA, LIMNEPHILIDAE, DICOSMOECINAE) (1989)
WIGGINS, GB and RICHARDSON, JS
Journal of the North American Benthological Society 8 (4) 355-369 - DIETARY VARIATIONS OF PREDACEOUS CADDISFLY LARVAE (TRICHOPTERA, RHYACOPHILIDAE, POLYCENTROPODIDAE AND ARCTOPSYCHIDAE) FROM BRITISH COLUMBIAN STREAMS (1988)
DUDGEON, D and RICHARDSON, JS
Hydrobiologia 160 (1) 33-43 - ECOLOGICAL NEIGHBORHOODS - SCALING ENVIRONMENTAL PATTERNS (1987)
ADDICOTT, JF and AHO, JM and ANTOLIN, MF and PADILLA, DK and RICHARDSON, JS and SOLUK, DA
Oikos 49 (3) 340-346 - PATTERNS OF GEOGRAPHIC VARIATION IN ADULT FLIGHT PHENOLOGY OF SOME NEARCTIC TRICHOPTERA (1987)
RICHARDSON J S
Bournaud, M. and H. Tachet (Ed.). Series Entomologica (the Hague), Vol. 39. Proceedings of the Fifth International Symposium on Trichoptera; Lyon, France, July 21-26, 1986. Xxiii+397p. Kluwer Academic Publishers: Dordrecht, Netherlands; Boston, Massachuse 211-216 - REVISION OF THE ONOCOSMOECUS-UNICOLOR GROUP TRICHOPTERA LIMNEPHILIDAE DICOSMOECINAE (1986)
WIGGINS G B and RICHARDSON J S
Psyche (Cambridge) 93 (3-4) 187-216 - A COMPARISON OF THE LIFE-HISTORY AND GROWTH OF LIMNEPHILUS-INDIVISUS (TRICHOPTERA, LIMNEPHILIDAE) IN 3 TEMPORARY POOLS (1984)
RICHARDSON, JS and MACKAY, RJ
Archiv Fur Hydrobiologie 99 (4) 515-528 - EFFECTS OF SESTON QUALITY ON THE GROWTH OF A LAKE-OUTLET FILTER FEEDER (1984)
RICHARDSON, JS
Oikos 43 (3) 386-390 - PREY SELECTION AND DISTRIBUTION OF A PREDACEOUS, NET-SPINNING CADDISFLY, NEURECLIPSIS-BIMACULATA (POLYCENTROPODIDAE) (1984)
RICHARDSON, JS
Canadian Journal of Zoology-Revue Canadienne De Zoologie 62 (8) 1561-1565 - LIFE-HISTORY AND MICRODISTRIBUTION OF NEURECLIPSIS-BIMACULATA (TRICHOPTERA, POLYCENTROPODIDAE) IN A LAKE OUTFLOW STREAM OF ALBERTA, CANADA (1983)
RICHARDSON, JS and CLIFFORD, HF
Canadian Journal of Zoology-Revue Canadienne De Zoologie 61 (11) 2434-2445 - REVISION AND SYNOPSIS OF THE CADDISFLY GENUS DICOSMOECUS (TRICHOPTERA, LIMNEPHILIDAE, DICOSMOECINAE) (1982)
WIGGINS, GB and RICHARDSON, JS
Aquatic Insects 4 (4) 181-217
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