The early bear gets the goose: climate change,polar bears and lesser snow geese in western Hudson Bay |
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Authors: | R F Rockwell L J Gormezano |
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Institution: | (1) Division of Vertebrate Zoology, The American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024, USA |
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Abstract: | As climate change advances the date of spring breakup in Hudson Bay, polar bears are coming ashore earlier. Since they would
have lost some of their opportunities to hunt ringed seals from a sea ice platform, they may be deficient in energy. Subadult
polar bears appear to come ashore before more mature individuals and the earliest subadults are beginning to overlap the nesting
period of the large colony of snow geese also occupying the Cape Churchill Peninsula. The eggs these bears are known to eat
could make up some of their energy shortfall. The earlier these eggs are consumed during the snow goose nesting period, the
greater would be the energy that is available. Recent studies have shown that the annual survival rate for subadult bears
declined in contrast to that of prime aged individuals. If this reduction in survival is related to an increasing energy deficit,
as suggested by some, the consumption of goose eggs may reverse the trend and help stabilize the population, at least for
some period of time. The total number of polar bears that could benefit from this resource will depend on the increasing temporal
overlap with the nesting period and on the foraging behaviors of individuals eating the eggs. It is likely that other food
sources will also have to play a role if the polar bears are to persist. |
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Keywords: | Chen caerulescens Climate change Eggs Energy compensation Foraging behavior Polar bear Snow goose Ursus maritimus |
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