Birds on top of the world, with nowhere to go

Birds on top of the world, with nowhere to go

Top image: The Red phalarope (Phalaropus fulicarius) might face serious challenges in a future warmer climate. Photo: Helen Flå/UNIS.

Climate change could make much of the Arctic unsuitable for millions of migratory birds that travel north to breed each year, according to a new international study published in Global Change Biology.

21 July 2016
Press release from the University of Queensland and UNIS

Arctic breeding shorebirds undertake some of the longest known migratory journeys in the animal kingdom, with many travelling more than 20,000 kilometres per year to escape the northern winter.

The new study predicts that, in a warming world, migratory birds will become increasingly restricted to small islands in the Arctic Ocean as they retreat north. This could cause declines in hard-hit regions and some birds could even completely change migratory pathways to migrate closer to suitable habitat.

The University of Queensland researcher and main author Hannah Wauchope said that suitable breeding conditions for Arctic shorebirds could collapse by 2070.

– This means that countries throughout the world will have fewer migratory birds reaching their shores, Wauchope said.

The new study was co-authored by UNIS associate professor Øystein Varpe, together with colleagues from Akvaplan-niva (Norway), the Russian Academy of Sciences (Moscow), Aarhus University (Denmark) and the US Fish and Wildlife Service in Alaska.

The research modelled the suitable climate breeding conditions of 24 Arctic shorebirds and projected them to 2070.

The researchers also examined the impact on Arctic birds of the world’s last major warming event about 6000 to 8000 years ago.

– Climatically suitable breeding conditions could shift and contract over the next 70 years, with up to 83 per cent of Arctic bird species losing most of their currently suitable area, Wauchope said. – This far exceeds the effects of the last major warming event on Earth, but genetic evidence suggests that even then the birds struggled to deal with the warming.

This could cause declines in hard-hit regions and some birds could even completely change migratory pathways to migrate closer to suitable habitat.

– Climate change is also opening up the Arctic to threats such as mining and tourism, and we must make sure we protect key places for all Arctic species, including these amazing migratory birds, Wauchope said.

She said that suitable climatic conditions are predicted to decline fastest in the areas with most species (western Alaska and eastern Russia), where Arctic birds are already becoming vulnerable to the “shrubification” of the tundra, and predators such as red foxes moving north.

Reference:
Wauchope, H. S., Shaw, J. D., Varpe, Ø., Lappo, E. G., Boertmann, D., Lanctot, R. B. and Fuller, R. A. (2016), Rapid climate-driven loss of breeding habitat for Arctic migratory birds . Glob Change Biol. doi:10.1111/gcb.13404

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