How a Massive Marine Heatwave Known as "The Blob" Killed 1 Million Seabirds in the U.S.
More victims have fallen into the grips of climate change. Approximately one million seabirds on the west coast of the U.S. died due to an unprecedented marine heatwave in the Pacific Ocean.
This heatwave is unpoetically referred to as "the blob." Scientists uncovered the news after 62,000 common murres (Uria aalge) washed up ashore between 2015 and 2016. It seemed as though they had died of starvation.
In total, researchers believe around one million seabirds died of the same causes in the area.
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6,000 kilometers where starved seabirds ended their lives
John Piatt of the U.S. Geological Survey wondered, "The amazing question is, how could a million die over 6000 kilometers, pretty much all at the same time, and what could cause it."
@DeltaOptimist: a seabird die off in 2015 explained by scientist @alaska_melanie quoted in @latimes. Common Murres died from lack of fish due to warm water (“the blob”). (Murres also get caught and drown in gill nets in #SalishSea)#Seabirds #ClimateChange https://t.co/d4gMUUTCyK— Nature Guides BC (@natureguidesbc) January 15, 2020
Furthermore, the sheer magnitude of these seabirds deaths over those years had researchers scratching their heads in wonder. Given the birds were so well adapted to that geographical area, it made no sense that they should die en masse in such a way.
After looking into the issue, it turns out that "the blob" is to blame.
This is a large, record-breaking patch of warm water that occurred off the west coast of the U.S. between 2013 and 2016.
By observing the beached murres, sea surface temperatures and fisheries information, Piatt and his team were able to come up with the plausible explanation of "the blob."
A massive marine #heatwave ("the Blob") in the #Pacific #Ocean may have been responsible for causing the deaths of 1 million #seabirds in 2015, says a study published yesterday. #Ecosystem changes may have caused them to starve. Read more: https://t.co/pj7Oqg0EBM#ClimateCrisis— IGES-Institute for Global Environmental Strategies (@IGES_EN) January 16, 2020
With warmer waters, fish in the area such as cod had to feed on more fish so as to regulate their core body temperatures. This minimized the amount of fish available for the murres to feed on. If these birds aren't able to eat half of their body mass worth of food every day, they die within only three to five days.
"It’s very convincing, and I would actually say it’s fairly conclusive. There’s very little else that could have caused the extensive effects they document," said Andrew Leising of the U.S. National Oceanic and Atmospheric Association.
Luckily, Piatt said that the murres will not become extinct anytime soon, however, the ecosystems that are affected by warmer waters will take decades to recover.
Their findings were published in the journal Plos One on Wednesday.