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The breeding biology of Cory's Shearwater\ud Calonectris diomedea borealis on Berlenga\ud Island, Portugal
No full textThe Berlengas Islands (39°24'N, 9°30'W) are a small group of granitic islands located off the\ud
western coast of Portugal and include the Estelas and Farilh5es, both uninhabited, and Berlenga\ud
itself where some fishermen livepermanently and which many tourist visit in July and August. The\ud
island has the only colony of Cory's Shearwater Calonectris diomedea borealis reported from the\ud
Atlantic coast of Iberia and it also has a small colony of Guillemots Uria aalge, on the\ud
southernmost limit of the species current breeding range (Cramp 1985). Most of the area was\ud
declared a Nature Reserve in 1981.\ud
Following recent census of seabirds (Araujo & Luis 1982, Teixeira 1983, Teixeira & Moore\ud
1983, Teixeira 1984, Vicente 1987), a study of the Cory's Shearwater population was initiated in\ud
1987 to establish baseline information for a subsequent annual monitoring programme. This paper\ud
describes the chronology of major events in the breeding cycle, including the growth sequence of\ud
nestlings, breeding success and population size. Morphometry of adult birds is also presented and\ud
compared with the colony of Selvagem Grande (Madeira)
The breeding biology of Cory's Shearwater on Berlenga\ud Island, Portugal
No full textIn 1987 a biological study of Cory's Shearwater at Berlenga Nature Reserve (Portugal) was initiated in order to establish baseline information for a monitoring scheme for the population. Adult morphometry is presented and compared with data from the colony of Selvagem Grande. The chronology of the major events of the breeding cycle is described and growth of chicks documented. The breeding success in 1987 was very low, mainly because of the high number of abandoned eggs. More work should be carried out to ensure strict control of the most vulnerable sites, avoiding undue disturbance to the breeding birds
On a Cory's Shearwater ringed at Selvagem Grande, Madeira (3009'N, 1552'W) and recovered on Berlenga Island, Portugal (3924'N, 930'W)
No full textResultados da Campanha de Inspeções Costeiras para a detecção de aves marinhas mortas no litoral continental português (1990/91)
No full text
