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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Aspects on the breeding biology of Cory's Shearwater (Calonectris diomedea) in the Maltese Islands
Auteurs :	John J. Borg, Auteur ; Joe Sultana, Auteur
Type de document :	Article
Dans :	Vogelwarte (40(4) Dezember, 2000)
Article en page(s) :	258-264
Langues:	Allemand
Résumé :	The population of Cory's Shearwater (Calonectris diomedea) in the Maltese Islands has been estimated at around 7,000 breeding pairs. The colonies are mainly found in inaccessible sheer limestone cliffs. The Cory's Shearwater has a life span of about 25 years; therefore, long-term studies are fundamental in determining the exact picture of their ecology and breeding biology. The first ringing studies were started in 1969 at a small colony on the island of Filfla through a capture - recapture programme. In 1983, a long-term study on the ecology and breeding biology was started at seventeen accessible nesting areas in colonies (ten in Malta and seven in Gozo) and over 155 nests were annually monitored. Over 2,500 Cory's Shearwaters, including both adults and chicks, have been ringed since 1965. Longevity, site-tenacity and mate fidelity, breeding success, movements and philopatry are presented. Three males ringed as adults have been retrapped after nineteen years while one female, also ringed as an adult, was retrapped after 17 years. One nest-site was used for 15 consecutive years by the same pair. Some birds were breeding at an earlier age than usual. This is due to intensive human interference, which greatly affects the normal pattern of behaviour of these colonial seabirds.

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