Journal
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
Volume 75, Issue 1, Pages 106-115Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/cjfas-2016-0249
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Funding
- Department of the Interior Northeast Climate Science Center
- United States Geological Survey National Climate Change and Wildlife Science Center [10909172]
- WDNR Federal Aid in Sport Fish Restoration [F-95-P]
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Lakes respond heterogeneously to climate, with implications for fisheries management. We analyzed walleye (Sander vitreus) recruitment to age-0 in 359 lakes in Wisconsin, USA, to (i) quantify the relationship between annual water temperature degree days (DD) and walleye recruitment success and (ii) identify the influence of lake characteristics - area, conductivity, largemouth bass (Micropterus salmoides) catch rates, and mean DD - on this relationship. The relationship between walleye recruitment and annual DD varied among lakes and was not distinguishable from zero overall (posterior mean = -0.11, 90% CI = -0.34, 0.15). DD effects on recruitment were negative in 198 lakes (55%) and positive in 161 (45%). The effect of annual DD was most negative in lakes with high largemouth bass densities, and, on average, the probability of recruitment was highest in large lakes with low largemouth bass densities. Conductivity and mean DD influenced neither recruitment nor the effect of annual DD. Walleye recruitment was most resilient to warming in lakes with few largemouth bass, suggesting that the effects of climate change depend on lake-specific food-web and habitat contexts.
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