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Some aspects of the population structure of Storm Petrels Hydrobates pelagicus breeding on a Mediterranean island

Between 1986 and 1998 1,374 adults and 1,708 chicks of Storm Petrels Hydrobates pelagicus have been ringed on Marettimo Is. (Sicily, Italy); 207 (15.1%) adults and 31 (1.8%) chicks were subsequently controlled. Only eight adults (0.6%) were recovered twice in different years after ringing. Site tenacity within the study site was observed, both of individuals ringed as adults and of those ringed as chicks, together with high intrapopulational turnover (neither adults after more than six years since ringing, nor individuals ringed as chicks aged more than seven years were recovered). This helps to explain eight cases of individuals ringed as chicks and recovered as breeding adults between one and three years after fledging.