Context-dependent interactions and the regulation of species richness in freshwater fish.

Autor:	MacDougall AS; Department of Integrative Biology, University Of Guelph, Guelph, Ontario, Canada, N1G 2W1. asm@uoguelph.ca., Harvey E; Department of Integrative Biology, University Of Guelph, Guelph, Ontario, Canada, N1G 2W1.; Institute Of Evolutionary Biology and Environmental Studies, University of Zurich, Ch-8057, Zürich, Switzerland.; Department Of Ecology and Evolutionary Biology, University Of Toronto, Toronto, Ontario, Canada, M5S 3B2., McCune JL; Department of Integrative Biology, University Of Guelph, Guelph, Ontario, Canada, N1G 2W1.; Department Of Biology, Carleton University, Ottawa, Ontario, Canada, K1S 5B6., Nilsson KA; Department of Integrative Biology, University Of Guelph, Guelph, Ontario, Canada, N1G 2W1.; Department of Ecology And Environmental Sciences, Umeå University, Umeå, SE-901 87, Sweden., Bennett J; Department Of Biology, Carleton University, Ottawa, Ontario, Canada, K1S 5B6., Firn J; Queensland University Of Technology, Brisbane, Queensland, 4000, Australia., Bartley T; Department of Integrative Biology, University Of Guelph, Guelph, Ontario, Canada, N1G 2W1., Grace JB; US Geological Survey, Wetland And Aquatic Research Center, 700 Cajundome Boulevard, Lafayette, Los Angeles, 70506, USA., Kelly J; Department of Integrative Biology, University Of Guelph, Guelph, Ontario, Canada, N1G 2W1., Tunney TD; Department of Integrative Biology, University Of Guelph, Guelph, Ontario, Canada, N1G 2W1.; Fisheries And Oceans Canada, Gulf Fisheries Centre, Moncton, New Brunswick, Canada, NB EC 9B6., McMeans B; Department of Integrative Biology, University Of Guelph, Guelph, Ontario, Canada, N1G 2W1.; University Of Toronto Mississauga, Mississauga, Ontario, Canada, L5L 1C6., Matsuzaki SS; National Institute For Environmental Studies, Tsukuba, 305-0053, Japan., Kadoya T; National Institute For Environmental Studies, Tsukuba, 305-0053, Japan., Esch E; Department of Integrative Biology, University Of Guelph, Guelph, Ontario, Canada, N1G 2W1., Cazelles K; Department of Integrative Biology, University Of Guelph, Guelph, Ontario, Canada, N1G 2W1., Lester N; Ontario Ministry of Natural Resources and Forestry, Peterborough, Ontario, Canada, K9J 8M5., McCann KS; Department of Integrative Biology, University Of Guelph, Guelph, Ontario, Canada, N1G 2W1.
Jazyk:	angličtina
Zdroj:	Nature communications [Nat Commun] 2018 Mar 06; Vol. 9 (1), pp. 973. Date of Electronic Publication: 2018 Mar 06.
DOI:	10.1038/s41467-018-03419-1
Abstrakt:	Species richness is regulated by a complex network of scale-dependent processes. This complexity can obscure the influence of limiting species interactions, making it difficult to determine if abiotic or biotic drivers are more predominant regulators of richness. Using integrative modeling of freshwater fish richness from 721 lakes along an 11 o latitudinal gradient, we find negative interactions to be a relatively minor independent predictor of species richness in lakes despite the widespread presence of predators. Instead, interaction effects, when detectable among major functional groups and 231 species pairs, were strong, often positive, but contextually dependent on environment. These results are consistent with the idea that negative interactions internally structure lake communities but do not consistently 'scale-up' to regulate richness independently of the environment. The importance of environment for interaction outcomes and its role in the regulation of species richness highlights the potential sensitivity of fish communities to the environmental changes affecting lakes globally.
Databáze:	MEDLINE
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