Trends in the Reproductive Phenology of two Great Lakes Fishes

Autor: Tammie J. Paoli, John Lyons, Jared T. Myers, Bradley T. Eggold, Peter B. McIntyre, Andrew L. Rypel, Thomas E. Burzynski, Paul W. Rasmussen
Rok vydání: 2015
Předmět:
Zdroj: Transactions of the American Fisheries Society. 144:1263-1274
ISSN: 1548-8659
0002-8487
Popis: To assess potential effects of climate change on Great Lakes fish populations, we evaluated trends in the reproductive phenology of Yellow Perch Perca flavescens (spring spawner) and Lake Trout Salvelinus namaycush (autumn spawner). For Yellow Perch in Lake Michigan, the estimated reproductive midpoint date (50% of mature females ripe or spent, 50% not yet spawned) took place 6.2 d/decade earlier in the spring near Milwaukee from 1988 to 2012 and 1.8 d/decade earlier in Green Bay from 1980 to 2012. At both locations water temperatures at the spawning sites on the midpoint date showed no trends, but mean water temperatures during the spring at the spawning site and midlake increased over the study period. This suggests that Yellow Perch spawning areas were warming sooner in the spring and that Yellow Perch were spawning earlier to maintain a consistent spawning temperature. Lake Trout phenological patterns were more complex. For Lake Trout in Lake Michigan near Milwaukee, there was a marginally sig...
Databáze: OpenAIRE
Externí odkaz: