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

Perkins, Daniel M., Durance, Isabelle, Edwards, Francois K., Grey, Jonathan, Hildrew, Alan G., Jackson, Michelle, Jones, J. Iwan, Lauridsen, Rasmus B., Layer-Dobra, Katrin, 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. 10.1111/ele.13147

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Abstract

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: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Wiley
ISSN: 1461-023X
Date of First Compliant Deposit: 1 October 2018
Date of Acceptance: 29 July 2018
Last Modified: 27 Feb 2020 19:30
URI: http://orca.cf.ac.uk/id/eprint/115402

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