L' évolution des effectifs des puffins cendrés Calonectris diomedea borealis de l' île Selvagem Grande (30° 09 N, 15° 52 W) de 1980 a 1983

Abstract

A count made at the end of June and beginning of July 1983 on the island of Selvagem Grande has shown the presence of 6,806 incubating Cory's Shearwaters Calonectris diomedea. Thus the population seems to number about 25,000 breeders, with an annual incre