Watersheds in southern Ontario are of high conservation concern due to their diverse fish communities, productive environments, and threats from numerous anthropogenic stressors. The Credit River watershed, located west of the Greater Toronto Area, has over 60 fish species, and multiple stressors including urbanization, climate change, and aquatic invasive species. This study examines fish community change in the Credit River watershed. Historical fish datasets collected in the watershed from 1954 to 2015 were analyzed to examine richness patterns, temporal trends in species distributions, and faunal similarity at the site and sub-watershed levels. Species richness increased over time at the site and sub-watershed level, displaying predictable richness patterns due to anthropogenic introductions and changes in sampling methods. Species distribution patterns remained largely stable over time with decreases in some species (e.g. Redside Dace) and increases in others (e.g. Largemouth Bass). Faunal similarity also increased over time at the site and sub-watershed level, indicating that the fish communities in the Credit River are homogenizing.
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Research Article|
July 03 2019
Historical changes in the fish communities of the Credit River watershed
Brett Allen;
Brett Allen
Department of Biological Sciences, University of Toronto Scarborough, Toronto, ON M1C 1A4
Department of Ecology and Evolutionary Biology, University of Toronto. Toronto, ON M5S 3B2
*Corresponding author: [email protected]
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Aquatic Ecosystem Health & Management (2019) 22 (3): 316–328.
Citation
Brett Allen, Nicholas E. Mandrak; Historical changes in the fish communities of the Credit River watershed. Aquatic Ecosystem Health & Management 3 July 2019; 22 (3): 316–328. doi: https://doi.org/10.1080/14634988.2019.1672463
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