Age-dependant adult survival in the Cory's Shearwater (Calonectris diomedea)

Mougin J.L., Jouanin C. & Roux F.

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In the Cory’s Shearwater Calonectris diomedea of Selvagem Grande (30°09’N, 15°52’W), the annual survival rate of the adult is age-dependant. After having remained almost constant during the first breeding years, it begins to decrease shortly after the 15th when the bird has not much passed its 25th year. Such a trend having also been observed in other seabird groups, it is likely to be widespread. The scarcity of the related data published is thus likely to be only a consequence of the length of the studies necessary to get them.