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

Autor: Perkins DM; Department of Life Sciences, Whitelands College, University of Roehampton, London, SW15 4JD, UK., Durance I; Cardiff Water Research Institute, Cardiff School of Biosciences, Cardiff University, PO Box 915, Cardiff, CF10 3TL, UK., Edwards FK; School of Biological and Chemical Sciences, Queen Mary University of London, London, E1 4NS, UK.; Centre for Ecology and Hydrology, Wallingford, OX10 8BB, UK., Grey J; School of Biological and Chemical Sciences, Queen Mary University of London, London, E1 4NS, UK.; Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK., Hildrew AG; School of Biological and Chemical Sciences, Queen Mary University of London, London, E1 4NS, UK.; Freshwater Biological Association, The Ferry Landing, Far Sawrey, Ambleside, Cumbria, LA22 OLP, UK., Jackson M; Grand Challenges in Ecosystems and the Environment, Department of Life Sciences, Imperial College London, Silwood Park Campus, Berkshire, SL5 7PY, UK., Jones JI; School of Biological and Chemical Sciences, Queen Mary University of London, London, E1 4NS, UK.; Centre for Ecology and Hydrology, Wallingford, OX10 8BB, UK., Lauridsen RB; School of Biological and Chemical Sciences, Queen Mary University of London, London, E1 4NS, UK.; Game & Wildlife Conservation Trust, Burgate Manor, Fordingbridge, Hampshire, SP6 1EF, UK., Layer-Dobra K; Grand Challenges in Ecosystems and the Environment, Department of Life Sciences, Imperial College London, Silwood Park Campus, Berkshire, SL5 7PY, UK., Thompson MSA; Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory, Pakefield Road, Lowestoft, Suffolk, NR33 0HT, UK., Woodward G; Grand Challenges in Ecosystems and the Environment, Department of Life Sciences, Imperial College London, Silwood Park Campus, Berkshire, SL5 7PY, UK.
Jazyk: angličtina
Zdroj: Ecology letters [Ecol Lett] 2018 Dec; Vol. 21 (12), pp. 1771-1780. Date of Electronic Publication: 2018 Sep 26.
DOI: 10.1111/ele.13147
Abstrakt: 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.
(© 2018 John Wiley & Sons Ltd/CNRS.)
Databáze: MEDLINE
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