| Titre : | Colony attendance patterns by mated Forster's Terns Sterna forsteri using an automated data-logging receiver system |
| Auteurs : | Jill D. Bluso-Demers, Auteur ; Joshua T. Ackerman, Auteur ; John Y. Takekawa, Auteur |
| Type de document : | Article |
| Dans : | Ardea (98(1) SPR 2010) |
| Article en page(s) : | 59-65 |
| Résumé : | In order to examine 24-hour colony attendance patterns by mated Forster's Terns Sterna torsteri in South San Francisco Bay, California. during incubation and chick-rearing stages, we radio-marked 10 individuals consisting of five pairs and recorded colony attendance using an automated data-logging receiver system. We calculated and analyzed five variables: the total attendance time by pairs and individuals, the duration of individual attendance bouts, and the duration both members of a pair either overlapped in colony attendance or were both absent from the colony. The percentage of time spent on the colony by at least one individual of a pair was highest during incubation and declined during chick rearing. Overall, male terns spent a greater proportion of tin-le diurnally attending the colony than females. Females spent a greater proportion of time on colony at night, and without these nocturnal records, we would have reported overall female colony attendance rates as being much lower. Despite sex-specific differences in attendance rates, the length of attendance bouts did not differ between the sexes. Simultaneous colony attendance by both members of a pair was high at night, but during the day, pairs infrequently overlapped in their colony attendance and both members were frequently absent. Our data-logging system functioned well, and our data illustrates the importance of collecting 24-hour records when considering attendance rates. |
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