Bending the rules : exploitation of allochthonous resources by a top-predator modifies size-abundance scaling in stream food webs

Perkins, Daniel M. and Durance, Isabelle and Edwards, Francois K. and Grey, Jonathan and Hildrew, Alan G. and Jackson, Michelle and Jones, J. Iwan and Lauridsen, Rasmus B. and Layer-Dobra, Katrin and Thompson, Murray S. A. and Woodward, Guy (2018) Bending the rules : exploitation of allochthonous resources by a top-predator modifies size-abundance scaling in stream food webs. Ecology Letters, 21 (12). pp. 1771-1780. ISSN 1461-023X

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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.

Item Type:
Journal Article
Journal or Publication Title:
Ecology Letters
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This is the peer reviewed version of the following article: Perkins, D. M., Durance, I. , Edwards, F. K., Grey, J. , Hildrew, A. G., Jackson, M. , Jones, J. I., Lauridsen, R. B., Layer‐Dobra, K. , Thompson, M. S. and Woodward, G. (2018), Bending the rules: exploitation of allochthonous resources by a top‐predator modifies size‐abundance scaling in stream food webs. Ecol Lett, 21: 1771-1780. doi:10.1111/ele.13147 which has been published in final form at This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Uncontrolled Keywords:
?? allometric scalingbody sizebrown troutenergetic subsidiesfood websmetabolic theorystable isotopesstreamsecology, evolution, behavior and systematics ??
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Deposited On:
26 Jun 2019 13:38
Last Modified:
21 Feb 2024 00:53