Climate Change Caused One of the Biggest Seabird Die-Offs Yet

In 2014 scientists and beachgoers began finding west coast shores littered with thousands of small bodies. Their tragic discoveries would turn into what would become one of the largest seabird die-offs recorded yet, and now scientists have linked the cause to climate change.

The birds who were washing up were Cassin’s Auklets, a portly little seabird who can be found from Mexico to Alaska.

Scientists, along with an army of citizen scientists began recording dates and locations of the birds they found, and that information, along with data on temperatures and food, has not provided an answer to what killed them.

According to scientists, who just published their findings in the journal Geophysical Research Letters, the cause was starvation, and it led to the deaths of somewhere between 250,000 and 500,000 Cassin’s auklets between 2014 and 2015.

“This paper is super important for the scientific community because it nails the causality of a major die-off, which is rare,” said the study’s lead author Julia Parrish, professor in the University of Washington’s (UW) School of Aquatic and Fishery Sciences and executive director of the Coastal Observation and Seabird Survey Team (COASST), one of the citizen science groups that counted the carcasses.

These birds are diving birds who feed mainly on zooplankton, or krill and copepods, but they were far less abundant during that time period. It’s believed that an enormous mass of warm water, which became known as “the blob,” pushed this food source too far away for the birds to get to. Instead, less nutritious food moved in, but it wasn’t enough to help them survive.

According to the study’s authors, this is the first time a direct link between marine heatwaves linked to climate change and marine bird mortality events has been documented.

“A lot of the evidence points to there being a very tangible link in the warming of the Pacific to changes in ecosystem structure that ultimately led to seabird starvation,” said lead author Timothy Jones, a UW postdoctoral researcher in aquatic and fishery sciences.

Sadly, the blob also led to other mass mortality events that continued to move farther north, killing thousands of Murres, puffins, short-tailed shearwaters and northern fulmars.

More concerning is that scientists are looking at this event as a small one, and fear worse is to come.

“This was a unique opportunity to have a window into the future,” Parrish added. “We are getting a sense of what the largescale ecosystem — the entire North Pacific up into the Bering and Chukchi seas — might look like in the future, and where we will have winners and losers and how we might see change. In that sense, it was a tremendous natural experiment.”

While this die-off is a tragic reminder of how fragile even large populations of wild animals really are, hopefully it will also be another wakeup call for us to do more to mitigate climate change.

Photo credit: U.S. Fish and Wildlife Service


Marie W
Marie W1 months ago

thanks for posting

KimJ M
KimJ M5 months ago

very depressing

Peggy B
Peggy B6 months ago


Danuta W
Danuta W7 months ago

Thanks for sharing.

Angela J
Angela J7 months ago


HEIKKI R7 months ago

thank you

Nicole H
Nicole Heindryckx7 months ago

@ Echo P : Start reading good articles, written by scientists about the dangers of seawater warming up with 1 / 3 degrees Celsius. Seawater moves in larges "waves" around the world. You have warm & cold water waves. When animals, like this little bird, but also other animals - also big sea mammals - need the smallest creatures in the sea like zooplankton, krill and copepods to feed themselves and their offspring, and those small creatures live in cold water, you will understand that a higher temperature of the seawater will push these away, looking for colder areas where they can live and feed. This is what happened here !!! It was observed and written down on a daily basis, that an unusual big wave of warmer water was present in the areas where these birds, the Cassin's Auklets, were usually diving for their normal food, IT HAD GONE !! ALL THEIR FOOD LEFT IN THE COLDER WATER, miles and miles from their "fishing" areas causing a big lack of food,and birds died from STARVATION !! Recordings were in 2014 and 2015 and dead birds were found during the same period. Strange ?? NO !! We WILL have other catastrophes. Will you EVER believe that "GLOBAL WARMING" is killing this planet and its habitants. Or are a distant family member of the POTUS ?

Echo P
Past Member 7 months ago

theres no such thing as climate change so the birdscdid NOT die from that. they died from something called natural selection thats when say a cat kills a bird. or a bird drank or ate something bad. but no the ird didnt die friom global warming quit believing in santa clause

Angela J
Angela J7 months ago


Winn A
Winn A7 months ago