Bending the rules: exploitation of allochthonous resources by a top‐predator modifies size‐abundance scaling in stream food webs
| Autor: | Katrin Layer-Dobra, Jonathan Grey, Guy Woodward, Rasmus B. Lauridsen, Daniel M. Perkins, Alan G. Hildrew, J. Iwan Jones, Isabelle Durance, Murray S. A. Thompson, Michelle C. Jackson, Francois Edwards |
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| Přispěvatelé: | Natural Environment Research Council (NERC) |
| Rok vydání: | 2018 |
| Předmět: |
TERRESTRIAL
0106 biological sciences Food Chain stable isotopes Environmental Sciences & Ecology STREAMS Body size metabolic theory 010603 evolutionary biology 01 natural sciences Ecology and Environment Predation Rivers Animals Dominance (ecology) Allometric scaling Scaling POPULATION Ecosystem Ecology Evolution Behavior and Systematics Apex predator UNIVERSAL Science & Technology Ecology BROWN TROUT 0602 Ecology Fishes Community structure streams 010601 ecology 0501 Ecological Applications BODY MASS RELATIONSHIPS food webs SALMO-TRUTTA energetic subsidies Environmental science Allometry body size Life Sciences & Biomedicine |
| Zdroj: | Ecology Letters. 21:1771-1780 |
| ISSN: | 1461-0248 1461-023X |
| DOI: | 10.1111/ele.13147 |
| Popis: | Body mass–abundance (M‐N) allometries provide a key measure of community structure, and deviations from scaling predictions could reveal how cross‐ecosystem subsidies alter food webs. For 31 streams across the UK, we tested the hypothesis that linear log‐log M‐N scaling is shallower than that predicted by allometric scaling theory when top predators have access to allochthonous prey. These streams all contained a common and widespread top predator (brown trout) that regularly feeds on terrestrial prey and, as hypothesised, deviations from predicted scaling increased with its dominance of the fish assemblage. Our study identifies a key beneficiary of cross‐ecosystem subsidies at the top of stream food webs and elucidates how these inputs can reshape the size‐structure of these ‘open’ systems. |
| Databáze: | OpenAIRE |
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