Oceanography SeminarDecember 12, 3:00pm - 4:15pm
Mānoa Campus, MSB 100
Dept. of Oceanography
“Explaining variation in life history timing: Fish spawning time in a changing climate”
Abstract: The capacity of a species to tolerate and/or adapt to environmental conditions will shape its response to future climate change. Of the many life-history processes affected by climate, timing of reproduction greatly influences offspring success and resulting population production. Here we explore temporal and spatial changes in spawning time for Atlantic cod (Gadus morhua) across the species’ range. We estimate spawning time using a physiologically relevant metric that includes information on fish thermal history (degree days, DD). First, we estimate spawning DD among years (within populations) to show recent changes in spawning time can be explained by local changes in temperature. Second, we employ spawning DD to identify temperature-independent trends in spawning time among populations that are consistent with the evolutionary history of the species. Finally, we use our results to estimate expected spawning time under future climate regimes, and discuss the implications for cod ecology across the species’ range.
Oceanography, Mānoa Campus