By George Divoky
The positive signs of colony size and breeding effort of the Black Guillemots on Cooper Island in June were too good to last.
After very high hatching success, the decreased ice and increased water temperatures took their toll as parents were unable to find prey in the warm, ice-free waters. Rapidly shifting ocean temperatures provided some days of good growth, but currently only one third of chicks are still alive. As the mortality was unfolding, we shared it with a reporter from the Washington Post for an article describing the impacts of climate change in Alaska in 2019.
The author notes that, “The early retreat of sea ice from the Bering and Chukchi seas has led to a jump in sea surface temperatures, altering weather patterns and upending the lives of residents who typically depend on the ice cover for hunting and fishing. It’s also affecting native species, including seals and seabirds.” They go on to quote me describing the high rate of chick mortality from the loss of sea ice, which limits guillemots’ access to their preferred prey, Arctic cod.
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