Séminaire présenté par T. GASTON

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Seabirds and ice in the Canadian Arctic

Par : Tony GASTON (Université d’Ottawa, Canada) invité par Y. Ropert-Coudert
Date : Vendredi 30 septembre 2011 à 11h00
Lieu : Bibliothèque du DEPE

Résumé :

Ice conditions in the northern hemisphere are changing rapidly with great consequences for Arctic marine ecosystems. I illustrate some changes ongoing in Hudson Bay, a large Canadian inland sea where Environment Canada has been studying the breeding biology of marine birds since the 1980s. Changes in seabird diets suggest major changes to regional food webs, while conservative behaviour by the birds is creating a mismatch between their timing of breeding and the peak availability of food. At the same time, other ecosystem components, including predators and parasites, by tracking more closely changes in ice conditions, are posing a greater threat to the birds.