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Spring migration of pink-footed geese under threat

As thousands of pink-footed geese (Anser brachyrhynchus) prepare for their spring migration north to breeding grounds in the Arctic, ecologists are warning that the escalating conflict between farmers and the geese is threatening the birds' survival. Writing in the new issue of the British Ecological Society's Journal of Applied Ecology, Professor Marcel Klaassen of the Netherlands Institute of Ecology says that international action is urgently required.

Farmers in northern- and mid-Norway are threatening to scale up efforts to scare the birds off their fields, which the geese use as a staging post on their migration north, unless they are compensated for the damage to crops and grassland.

Together with colleagues in Denmark and Norway, Klaassen used data from ringed geese collected between 1991 and 2003 to model the impact of organised scaring of pink-footed geese. They found that any rapid escalation of bird scaring could be catastrophic for the birds, especially for less experienced individuals.

According to Klaassen: "The model predicts that if scaring on a large scale is implemented abruptly, it will have severe consequences for the population because the geese will not have time to adjust their behaviour to their dramatically changed environment. We are already seeing signs of decreasing annual breeding success and decreased summer survival as a result of poor body condition when the geese depart from the spring staging areas. Our model shows that naïve geese have much lower fitness than experienced geese, which are able to anticipate and adapt to changes in their environment."

There are two discrete populations of pink-footed goose: the Greenland/Iceland population, which breeds in Iceland and Greenland and overwinters in Britain; and the Svalbard population. The Svalbard group overwinters in Denmark, Belgium and the Netherlands and migrates to breeding grounds in Svalbard (an archipelago hundreds of miles off the north coast o
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Source:Blackwell Publishing Ltd.


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