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Context-dependent interactions and the regulation of species richness in freshwater fish
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Department of Integrative Biology, University Of Guelph, Guelph, Ontario, Canada N1G 2W1. (Arcum)
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2018 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 9, article id 973Article in journal (Refereed) Published
Abstract [en]

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 degrees 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.

Place, publisher, year, edition, pages
Nature Publishing Group, 2018. Vol. 9, article id 973
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Ecology
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URN: urn:nbn:se:umu:diva-146144DOI: 10.1038/s41467-018-03419-1ISI: 000426660300005PubMedID: 29511186OAI: oai:DiVA.org:umu-146144DiVA, id: diva2:1203481
Available from: 2018-05-03 Created: 2018-05-03 Last updated: 2018-06-09Bibliographically approved

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Harvey, EricNilsson, Karin A.Cazelles, Kevin

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CiteExportLink to record
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