Arctic seabirds are less heat tolerant, more vulnerable to climate change
The Arctic is warming at approximately twice the global rate. A new study led by researchers from 平特五不中 finds that cold-adapted Arctic species, like the thick-billed murre, are especially vulnerable to heat stress caused by climate change.
鈥淲e discovered that murres have the lowest cooling efficiency ever reported in birds, which means they have an extremely poor ability to dissipate or lose heat,鈥� says lead author Emily Choy, a Postdoctoral Fellow in the Natural Resource Sciences Department at 平特五不中.
Following reports of the seabirds dying in their nests on sunny days, the researchers trekked the cliffs of Coats Island in northern Hudson Bay to study a colony of 30,000 breeding pairs. They put the birds鈥� heat tolerance to the test and found that the animals showed signs of stress at temperatures as low as 21C.
Until now few studies have explored the direct effects of warming temperatures on Arctic wildlife. The study, published in , is the first to examine heat stress in large Arctic seabirds.
Bigger not always better
By measuring breathing rates and water loss as the murres were subjected to increasing temperatures, the researchers found that larger birds were more sensitive to heat stress than smaller birds.
Weighing up to one kilogram, murres have a very high metabolic rate relative to their size, meaning when they pant or flap their wings to cool off, they expend a very high amount of energy, producing even more heat.
These seabirds nest in dense colonies, often breeding shoulder to shoulder along the narrow ledges of cliffs. Male and female birds take turns nesting on 12-hour shifts. According to the researchers, the thick-billed murres鈥� limited heat tolerance may explain their mortalities on warm weather days.
鈥淥verheating is an important and understudied effect of climate change on Arctic wildlife,鈥� says Choy. 鈥淢urres and potentially other Arctic species are poorly adapted for coping with warming temperatures, which is important as the Arctic continues to warm.鈥�
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About this study 鈥淟imited heat tolerance in a cold-adapted seabird: implications of a warming Arctic鈥� by Emily Choy, Ryan O鈥機onnor, Grant Gilchrist, Anna Hargreaves, Oliver Love, Francois Vezina, and Kyle Elliott was published in the . DOI: |
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