Foraging behaviour and habitat use of a short-ranging seabird, the crested tern
Autor: | Brad Page, Carlos E. P. Teixeira, P Burch, Simon D. Goldsworthy, Tim M. Ward, David C. Paton, Lachlan J. McLeay |
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Rok vydání: | 2010 |
Předmět: | |
Zdroj: | Marine Ecology Progress Series. 411:271-283 |
ISSN: | 1616-1599 0171-8630 |
Popis: | We used satellite tracking technology on the crested tern Sterna bergii, a seabird weighing 0.5 mg m -3 ). The most well-supported model (generalised linear mixed model) of foraging behaviour indicated a positive relationship between time spent at sea, distance travelled and chl a, suggesting individuals spent relatively more time foraging at greater distances from the colony in zones of higher primary production. The timing and location of crested tern breeding may be linked to the 2-fold increase in primary production near Troubridge Island over the austral sum- mer. Individual differences in the length (distance and duration) of foraging trips may reflect either prior knowledge of where prey aggregations exist, distinctions in individual niche use driven by the types or sizes of prey available, and/or alternate behavioural states (self feeding and provisioning). The restricted foraging range of crested terns while breeding may make them sensitive to competi- tion with fisheries that operate within their foraging range. |
Databáze: | OpenAIRE |
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