James Buchanan Wallace

Publications75
h-index27
Citations5,413
Highly Influential Citations304
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Consumer‐resource stoichiometry in detritus‐based streams
TLDR
Large elemental imbalances between consumers and food resources compared with living plant-based systems are found, particularly in regard to P content, which were reduced with enrichment, and nutrient content varied significantly among invertebrate functional feeding groups, orders and, to some extent, size classes.
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The Contribution of Headwater Streams to Biodiversity in River Networks 1
Abstract:  The diversity of life in headwater streams (intermittent, first and second order) contributes to the biodiversity of a river system and its riparian network. Small streams differ widely in…
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The role of macroinvertebrates in stream ecosystem function.
TLDR
This review focuses on some of the roles of macroinvertebrate functional groups, i.e. grazers, shredders, gatherers, filterers, and predators, in stream-ecosystem processes, and the importance of their conservation.
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Life history and production of stream insects.
TLDR
This review focuses on how life-history attributes influence the production dynamics of stream insects and other macroinvertebrates, and limits current understanding of mechanisms controlling stream productivity.
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Nutrients stimulate leaf breakdown rates and detritivore biomass: bottom-up effects via heterotrophic pathways
TLDR
Low quality rhododendron leaves exhibited greater changes in leaf nutrient content and macroinvertebrate response to nutrient enrichment than red maple leaves, suggesting a unique response by different leaf species to nutrients enrichment.
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Stream macroinvertebrate response to catchment urbanisation ( Georgia ,
1. The effects of catchment urbanisation on water quality were examined for 30 streams (stratified into 15, 50 and 100 km ± 25% catchments) in the Etowah River basin, Georgia, U.S.A. We examined…
Whole-system nutrient enrichment increases secondary production in a detritus-based ecosystem.
TLDR
It is demonstrated that positive nutrient-induced changes to food quality likely override negative changes toFood quantity for consumers during the initial years of enrichment of detritus-based stream ecosystems, and that long-term enrichment may impact consumers through eventual reductions in the quantity ofdetritus.
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Organic matter flow in stream food Webs with reduced detrital resource base
TLDR
These food webs enabled us to examine interactions among taxa in the streams and found responses of the stream ecosystem to litter- exclusion that the authors would not have considered had they only measured changes in invertebrate population sizes or system-level changes in organic matter flow.
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Nutrient enrichment reduces constraints on material flows in a detritus-based food web.
TLDR
The results demonstrate that nutrient enrichment of detritus-based systems may reduce stoichiometric constraints on material flows, increase the contribution of consumers to C, N, and P cycling, alter the proportion of C inputs metabolized by consumers, and potentially lead to reduced ecosystem-level storage of C.
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Experimental nutrient additions accelerate terrestrial carbon loss from stream ecosystems
TLDR
Terrestrial carbon is rapidly lost from stream ecosystems as a result of nutrient enrichment, and this magnitude of terrestrial C loss can potentially exceed predicted algal C gains with nutrient enrichment across large parts of river networks, diminishing associated ecosystem services.
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