Warming seas could put at-risk seabirds out of sync with prey
Seabirds may struggle to find food for their chicks as they are unable to shift their breeding seasons as the climate warms, a study suggests.
Rising sea temperatures in coming decades could create a mismatch between breeding periods and times when prey is most plentiful, researchers say.
The findings suggest that if prey species continue to shift their breeding seasons forward – as previous studies have shown in some regions – it could further threaten the survival of vulnerable seabirds such as puffins and albatrosses.
A team from the University of Edinburgh, the Centre for Ecology & Hydrology and British Antarctic Survey studied data on the breeding patterns of 62 seabird species between 1952 and 2016, as sea surface temperatures rose sharply.
They found that seabirds have not altered their breeding times in response to rising temperatures.
Previous research has shown however that climate change has brought forward when many prey species – including squid, shrimp and small fish – reproduce.
Seabirds have much longer lifespans than their prey and do not reproduce until they are a few years old, which means it takes them many more generations to adapt, researchers say.
The team assessed 145 bird populations at 60 locations across every continent.
These included the British Antarctic Survey’s sub-Antarctic Bird Island Research Station and the Centre for Ecology & Hydrology’s field site on the Isle of May in the Firth of Forth.
The study, published in the journal Nature Climate Change, received funding from the Natural Environment Research Council.
“Many plants and animals now breed earlier than in previous decades, so our finding that seabirds haven't responded to changing environments is really surprising.”
“This collaboration was a global team effort, bringing together many of the world's seabird scientists and the data they have spent many years collecting. Uniting these studies has allowed us to draw powerful conclusions about the climate response of one of the most vulnerable bird groups on the planet.”
Global phenological insensitivity to shifting ocean temperatures among seabirds, Nature Climate Change