Il Nuovo Postiglione - Seabird habitats shrink as ocean heats up: study

While warmer oceans have historically caused fish and other marine species to shrink in size, seabirds such as albatrosses, shearwaters and petrels have seen their geographic range contract, the study said.

The researchers used statistical models to look at how seabirds coped with climate change across millions of years and project what their future could look like.

"In both of the scenarios we saw the same answer: Every time, when the climate changed faster... the range of distribution (of seabirds) started to decrease, to contract, to be smaller," Jorge Avaria-Llautureo, lead author of the study in the journal Nature Climate Change, told AFP.

Driven by planet-heating fossil fuel emissions, climate change is raising global temperatures and disrupting marine ecosystems as oceans get warmer.

Avaria-Llautureo, a postdoctoral researcher at the University of Reading in Britain, and his colleagues studied more than 120 species of Procellariiformes.

As climate change accelerates, the suitable habitat for these seabirds shrinks and their mortality rate increases, Avaria-Llautureo said.

Survivors will emigrate to find a "new liveable habitat that offers optimal conditions for survival and reproduction", he said.

"The crucial factor is that seabirds differ in their dispersal ability," the researcher added.

"The farther these suitable habitats are located in the future, the less likely it is that birds with limited flying capacity will successfully reach them, increasing their extinction risk under projected scenarios of rapid global warming," he said.

In a worst-case warming scenario, 70 percent of species will reduce their range by 2100, with four of them most at risk of extinction -- the Galapagos petrel, the Jouanin petrel, the Newell's shearwater and the white-vented storm petrel.

T.Barbieri--INP