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FISH INVASION RESTRUCTURES STREAM AND FOREST FOOD WEBS BY INTERRUPTING RECIPROCAL PREY SUBSIDIES

2004; Wiley; Volume: 85; Issue: 10 Linguagem: Inglês

10.1890/04-138

1939-9170

Colden V. Baxter, Kurt D. Fausch, Masashi Murakami, Phillip L. Chapman,

Environmental DNA in Biodiversity Studies

EcologyVolume 85, Issue 10 p. 2656-2663 Regular Article FISH INVASION RESTRUCTURES STREAM AND FOREST FOOD WEBS BY INTERRUPTING RECIPROCAL PREY SUBSIDIES Colden V. Baxter, Colden V. Baxter Graduate Degree Program in Ecology and Department of Fishery and Wildlife Biology, Colorado State University, Fort Collins, Colorado 80523 USA Present address: Department of Biological Sciences, Idaho State University, Pocatello, Idaho 83209 USA. E-mail: baxterco@cnr.colostate.eduSearch for more papers by this authorKurt D. Fausch, Kurt D. Fausch Graduate Degree Program in Ecology and Department of Fishery and Wildlife Biology, Colorado State University, Fort Collins, Colorado 80523 USASearch for more papers by this authorMasashi Murakami, Masashi Murakami Field Science Center for the Northern Biosphere, Tomakomai Research Station, Hokkaido University, Tomakomai 053-0035 JapanSearch for more papers by this authorPhillip L. Chapman, Phillip L. Chapman Department of Statistics, Colorado State University, Fort Collins, Colorado 80523 USASearch for more papers by this author Colden V. Baxter, Colden V. Baxter Graduate Degree Program in Ecology and Department of Fishery and Wildlife Biology, Colorado State University, Fort Collins, Colorado 80523 USA Present address: Department of Biological Sciences, Idaho State University, Pocatello, Idaho 83209 USA. E-mail: baxterco@cnr.colostate.eduSearch for more papers by this authorKurt D. Fausch, Kurt D. Fausch Graduate Degree Program in Ecology and Department of Fishery and Wildlife Biology, Colorado State University, Fort Collins, Colorado 80523 USASearch for more papers by this authorMasashi Murakami, Masashi Murakami Field Science Center for the Northern Biosphere, Tomakomai Research Station, Hokkaido University, Tomakomai 053-0035 JapanSearch for more papers by this authorPhillip L. Chapman, Phillip L. Chapman Department of Statistics, Colorado State University, Fort Collins, Colorado 80523 USASearch for more papers by this author First published: 01 October 2004 https://doi.org/10.1890/04-138Citations: 364 Corresponding Editor: A. S. Flecker Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract Habitat alteration and biotic invasions are the two leading causes of global environmental change and biodiversity loss. Recent innovative experiments have shown that habitat disturbance can have drastic effects that cascade to adjacent ecosystems by altering the flow of resource subsidies from donor systems. Likewise, exotic species invasions could alter subsidies and affect distant food webs, but very few studies have tested this experimentally. Here we report evidence from a large-scale field experiment in northern Japan that invasion of nonnative rainbow trout (Oncorhynchus mykiss) interrupted reciprocal flows of invertebrate prey that drove stream and adjacent riparian forest food webs. Rainbow trout usurped terrestrial prey that fell into the stream, causing native Dolly Varden charr (Salvelinus malma) to shift their foraging to insects that graze algae from the stream bottom. This indirectly increased algal biomass, but also decreased biomass of adult aquatic insects emerging from the stream to the forest. In turn, this led to a 65% reduction in the density of riparian-specialist spiders in the forest. Thus, species invasions can interrupt flows of resources between interconnected ecosystems and have effects that propagate across their boundaries, effects that may be difficult to anticipate without in-depth understanding of food web relationships. Citing Literature Volume85, Issue10October 2004Pages 2656-2663 RelatedInformation