Increased consumption of Chinook salmon by seals and sea lions in the Salish Sea “could be masking the success of coastwide salmon recovery efforts,” according to a new study published this week in the journal Scientific Reports. Endangered resident orcas are said to be declining in part due to a lack of available Chinook, the orcas’ preferred prey.
Our 2016 article “Killer whale miscarriages linked to low food supply” provided an early look at a study published this week in the journal PLOS ONE.
PSI senior writer Christopher Dunagan wrote the article based on research that was presented at the 2016 Salish Sea Ecosystem Conference, and it remains a helpful summary of the newly published findings.
Scientists have found that Puget Sound’s endangered Southern Resident Killer Whales are experiencing a high rate of miscarriages in large part because they are not getting enough food. The whales depend primarily on diminished populations of Chinook salmon and this scarcity magnifies other existing threats ranging from toxic PCBs to noise pollution.
The PLOS ONE study was co-authored by Samuel K. Wasser , Jessica I. Lundin, Katherine Ayres, Elizabeth Seely, Deborah Giles, Kenneth Balcomb, Jennifer Hempelmann, Kim Parsons, and Rebecca Booth. Dunagan’s article summarizing their findings is available on the Encyclopedia of Puget Sound.
Last month, more than 1100 scientists and researchers converged on Vancouver, B.C. to attend the Salish Sea Ecosystem Conference. The biennial conference is the region’s largest gathering on the state of the ecosystem, and we sent a group of reporters to bring back some of the highlights. Over the next several months, we’ll be collecting those highlights into a new series on the Encyclopedia of Puget Sound. We kick things off today with a must-read story from Christopher Dunagan. He reports that scientists may be changing their view of how PCBs and other toxics enter the Puget Sound food web. Read the story in Salish Sea Currents.
From orcas to starfish to humans, disease affects every living creature in the ecosystem. Scientists are increasingly alarmed by its potential to devastate already compromised populations of species in Puget Sound.