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Confirmatory Results

Boreal river impoundments caused little change in fish diversity but clear community assemblage shifts: A multi-scale analysis

Katrine Turgeon, Christian Turpin, Irene Gregory-Eaves
doi: https://doi.org/10.1101/129403
Katrine Turgeon
1Department of Biology, McGill University, 1205 Docteur Penfield Avenue, Montréal, QC, CANADA, H3A 1B1
2Hydro-Québec, Environment and Corporate Affairs, 75 René-Lévesque, Montréal, QC, CANADA, H2Z 1A4
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  • For correspondence: katrine.turgeon@mail.mcgill.ca
Christian Turpin
2Hydro-Québec, Environment and Corporate Affairs, 75 René-Lévesque, Montréal, QC, CANADA, H2Z 1A4
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Irene Gregory-Eaves
1Department of Biology, McGill University, 1205 Docteur Penfield Avenue, Montréal, QC, CANADA, H3A 1B1
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Abstract

  1. Hydroelectricity is often presented as a clean and renewable energy source, but river flow regulation and fragmentation caused by dams are recognized to impact aquatic biodiversity in temperate and tropical ecosystems. However, the effects of boreal river impoundment are not clear as the few studies that exist have not been able to separate the hydrological changes brought about by dams from other factors (e.g. fish stocking, and species introduction).

  2. We adopted a multi-scale analysis to examine changes in nearshore fish communities over 20 years (spanning before and after impoundment) using a network of 24 sampling stations spread across from four reservoirs and two hydroelectricity complexes located in the boreal region (Northern Québec, Canada). Given the remote location, confounding factors were minimal.

  3. We found no strong temporal trends in alpha- and gamma-diversity in impacted stations (upstream and downstream of the dam) relative to reference sites across the three spatial scales. Using beta-diversity analyses, we also detected a high stability in fish composition over time and space at the complex and reservoir scales.

  4. At the scale of the sampling stations, we observed higher rates of species turnover (beta-diversity) coincident with the time of reservoir filling and shortly after. Likewise, we detected species assemblage shifts that correlated with time since impoundment only at the sampling station scale. This pattern was masked at the complex and reservoir scales.

  5. Synthesis and applications. Overall, the isolated effect of impoundment in these remote boreal ecosystems caused no loss of species and little change in fish diversity over 20 years, but resulted in substantial species assemblage shifts. Our work shows that examining community data at different scales is key to understand the anthropogenic impacts on fish biodiversity.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-ND 4.0 International license.
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Posted November 16, 2017.
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Boreal river impoundments caused little change in fish diversity but clear community assemblage shifts: A multi-scale analysis
Katrine Turgeon, Christian Turpin, Irene Gregory-Eaves
bioRxiv 129403; doi: https://doi.org/10.1101/129403
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Boreal river impoundments caused little change in fish diversity but clear community assemblage shifts: A multi-scale analysis
Katrine Turgeon, Christian Turpin, Irene Gregory-Eaves
bioRxiv 129403; doi: https://doi.org/10.1101/129403

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