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Oxythermal habitat as a primary driver of ecological niche and genetic diversity in cisco ( Coregonus artedi )

2021; Canadian Science Publishing; Volume: 79; Issue: 3 Linguagem: Inglês

10.1139/cjfas-2021-0059

1205-7533

Ryan C. Grow, Kyle D. Zimmer, Jennifer L. Cruise, Simon K. Emms, Loren M. Miller, Brian R. Herwig, David F. Staples, Angela R. Tipp, Greta M. Gerdes, Peter C. Jacobson,

Genetic diversity and population structure

Cisco (Coregonus artedi) are threatened by climate change and lake eutrophication, and their oxythermal habitat can be assessed with T DO3 , the water temperature at which dissolved oxygen equals 3 mg·L −1 . We assessed the influence of T DO3 on cisco habitat use, genetic diversity, diets, and isotopic niche in 32 lakes ranging from oligotrophic to eutrophic. Results showed that as T DO3 increased, cisco were captured higher in the water column, in a narrower band, with higher minimum temperatures and lower minimum dissolved oxygen. T DO3 was also negatively related to cisco allelic richness and expected heterozygosity, likely driven by summer kill events. Moreover, T DO3 influenced the isotopic niche of cisco, as fish captured deeper were more depleted in δ 13 C and more enriched in δ 15 N compared to epilimnetic baselines. Lastly, cisco in high T DO3 lakes consumed more Daphnia, had fewer empty stomachs, and achieved larger body size. Our work identifies specific characteristics of cisco populations that respond to climate change and eutrophication effects and provides a framework for understanding responses of other cold-water species at the global scale.