Warming reduces trophic diversity in high-latitude food webs.

Autor: Jackson MC; Department of Biology, University of Oxford, Oxford, UK.; Somerville College, University of Oxford, Oxford, UK., O'Gorman EJ; School of Life Sciences, University of Essex, Colchester, UK., Gallo B; Georgina Mace Centre for the Living Planet, Department of Life Sciences, Imperial College London, Ascot, UK., Harpenslager SF; B-WARE Research Centre, Nijmegen, The Netherlands.; School of Biological and Behavioural Sciences, Queen Mary University of London, London, UK., Randall K; School of Life Sciences, University of Essex, Colchester, UK.; Applied Sciences Department, Northumbria University, Newcastle upon Tyne, UK., Harris DN; School of Life Sciences, University of Essex, Colchester, UK.; Georgina Mace Centre for the Living Planet, Department of Life Sciences, Imperial College London, Ascot, UK., Prentice H; School of Life Sciences, University of Essex, Colchester, UK., Trimmer M; School of Biological and Behavioural Sciences, Queen Mary University of London, London, UK., Sanders I; School of Biological and Behavioural Sciences, Queen Mary University of London, London, UK., Dumbrell AJ; School of Life Sciences, University of Essex, Colchester, UK., Cameron TC; School of Life Sciences, University of Essex, Colchester, UK., Layer-Dobra K; Georgina Mace Centre for the Living Planet, Department of Life Sciences, Imperial College London, Ascot, UK., Bespalaya Y; N. Laverov Federal Centre for Integrated Arctic Research, Ural Branch, Russian Academy of Sciences, Arkhangelsk, Russia., Aksenova O; N. Laverov Federal Centre for Integrated Arctic Research, Ural Branch, Russian Academy of Sciences, Arkhangelsk, Russia., Friberg N; Department of Ecoscience, Aarhus University, Aarhus, Denmark., Moliner Cachazo L; Department of Life Sciences, Natural History Museum, London, UK., Brooks SJ; Department of Life Sciences, Natural History Museum, London, UK., Woodward G; Georgina Mace Centre for the Living Planet, Department of Life Sciences, Imperial College London, Ascot, UK.
Jazyk: angličtina
Zdroj: Global change biology [Glob Chang Biol] 2024 Oct; Vol. 30 (10), pp. e17518.
DOI: 10.1111/gcb.17518
Abstrakt: The physical effects of climate warming have been well documented, but the biological responses are far less well known, especially at the ecosystem level and at large (intercontinental) scales. Global warming over the next century is generally predicted to reduce food web complexity, but this is rarely tested empirically due to the dearth of studies isolating the effects of temperature on complex natural food webs. To overcome this obstacle, we used 'natural experiments' across 14 streams in Iceland and Russia, with natural warming of up to 20°C above the coldest stream in each high-latitude region, where anthropogenic warming is predicted to be especially rapid. Using biomass-weighted stable isotope data, we found that community isotopic divergence (a universal, taxon-free measure of trophic diversity) was consistently lower in warmer streams. We also found a clear shift towards greater assimilation of autochthonous carbon, which was driven by increasing dominance of herbivores but without a concomitant increase in algal stocks. Overall, our results support the prediction that higher temperatures will simplify high-latitude freshwater ecosystems and provide the first mechanistic glimpses of how warming alters energy transfer through food webs at intercontinental scales.
(© 2024 The Author(s). Global Change Biology published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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