Speaker: John Durban, Department of Fisheries and Wildlife, Oregon State University and Senior Scientist, North Gulf Oceanic Society

Topic: Survival of the fattest: integrating photogrammetry measures of health into population assessments for killer whales

Killer whales are apex predators, and their health can therefore indicate dynamics in ecosystems that support them. Their population status is typically assessed using photographic identification of naturally-marked individuals in either complete censuses or mark-recapture estimates. However, killer whales are long-lived and their populations are slow-growing; the resultant small numbers of annual births or deaths necessitate long time series to detect significant population trends. Dr Durban will describe two case studies to demonstrate how drone-derived photogrammetry measures of body condition can enhance statistical power to detect and interpret population changes. Drawing on his long-term, collaborative studies of endangered Southern Resident killer whales off Washington State and killer whales in Antarctica, Dr Durban will describe how photogrammetry measures can be predictive of future mortality risk and therefore provide an early warning of impending population effects. The resultant data are being used to support enhanced recovery measures for Southern Resident killer whales and understand the ecosystem effects of rapid environmental changes around the Antarctic Peninsula.

Link: https://oregonstate.zoom.us/j/94555731151?pwd=RnJ6eVg0ODdzRUpVc0pQbUlIdUV3dz09