Birds Canada calling on British Columbians to help ID dead seabirds | CBC News
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It’s a different kind of bird watching.
Birds Canada is asking British Columbians to help monitor dead seabirds found on shorelines to help scientists better identify how certain events, such as climate change and oil spills, affect seabird health. And while help is needed year-round, conservationists are particularly worried this summer because of a Pacific marine heat wave that could cause mass deaths.
“These marine heat waves result in die-offs of bird populations, especially sea birds,” said David Bradley, the B.C. director of Birds Canada.
Pacific marine heat waves generally begin when summer temperatures spike and high Pacific winds slow, quickly heating up the surface temperature of the water.
This particular marine heat wave started forming about 1,600 kilometres off the coast in May but, in recent weeks, has migrated west toward B.C. and Oregon. It is now about four million square kilometres, and over recent weeks, surface temperatures are up to five degrees higher than usual.
Bradley, speaking to CBC’s On The Island Tuesday, said elevated ocean water temperatures prevent nutrient-rich cold water from rising to the surface, which can cause seabirds to starve.
A study published in July using research from Bradley and numerous other scientists along the Pacific Coast from California to Alaska looked at approximately 90,000 surveys of dead seabirds and found there were five mass die-offs (more than 500 kilometres in extent, greater than 10 carcasses per kilometre) between 2014 and 2019 in the northeast Pacific and Bering Sea. Scientists connected warm ocean events to disease or starvation in those five situations.
“When the heat wave happens, it suppresses that cold water upwelling and that often results in a reduction of food supply and that results, unfortunately, in seabirds dying,” said Bradley.
Marine birds that breed in B.C. are of particular concern, including Rhinoceros Auklets, terns, gulls and ducks.
To contribute to research on seabird mortality, all you need to do is walk the beach once a month and check for seabird carcasses along the shoreline after a high tide. Volunteers will be given a kit from Bird Canada that includes a field guide, gloves and metal tags.
The idea is to try to identify the species and tag it so that it won’t be double counted and, if found again, it can be determined how long it was on the beach.
Beached Bird Survey participants are important year-round, but the current heat wave has created an acute need this summer. To join the program, email bcvolunteer@birdscanada.org and identify what beach route you hope to patrol.
“There are always gaps to fill,” said Bradley.
Watch | How a marine heat wave is affecting the B.C. coast:
How warming temperatures in the Pacific Ocean could harm marine ecosystems in B.C.
Data from the U.S.-based National Oceanic and Atmospheric Administration (NOAA) shows that some parts of the Pacific Ocean are experiencing a Category IV, or “extreme” heat wave — the most severe level in the organization’s ranking system.
Because this year is projected to be an El Nino year, this particular marine heat wave could take a longer time to cool down.
While it’s too early to predict whether El Nino conditions will worsen or extend this marine heat wave, William Cheung, the director of UBC’s Institute for the Oceans and Fisheries, said it’s critical to study what these conditions will do to our shores.
“One of the predictions and projections that scientists have made is that […] with climate change, these heat waves will become more frequent and more intense in the future,” he said.
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