Abstract
Predation is a major ecological and evolutionary driver of natural populations, greatly influencing fitness and behaviour of prey species. Small, long-lived petrels are vulnerable to predation at the breeding colonies and are expected to evolve behavioural strategies to minimize predation risks. Using an automatic nest monitoring system and nightly aerial counts, we examined the effect of vegetation cover and moonlight on colony attendance patterns and levels of burrow activity of breeding thin-billed prions, Pachyptila belcheri, on New Island, Falkland Islands. We further investigated how these parameters were related to predation by Falkland skuas. We monitored up to 32 nests in two habitats, one with Tussock grass and one with low vegetation cover. Individuals in both areas were more active at the nest before hatching, and those breeding in the low cover habitat were more active and arrived at the colony earlier, which might reflect an effect of reaction time over predation risk. Nocturnal activity peaks shifted in time as the season progressed, indicating behavioural adjustments to sunrise hours. Moon phase did not affect attendance and activity levels of breeders in either habitat or overall aerial activity, but influenced arrival time at the colony during chick-rearing, individuals arriving later in periods of full moon. Skua capture rates were positively correlated with aerial and nest activity but not with overall breeder attendance and were unaffected by moon phase. Thin-billed prions activity budgets are influenced by environmental parameters that affect their likelihood of being predated.
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Acknowledgments
The authors are grateful to S. MacKay for invaluable help with fieldwork, database organization and review of early versions of the manuscript. We are also grateful to the Physics Department, University of Washington, for access to equipment necessary to roll the coils, and to M. Burns, University of Glasgow for help with system maintenance. We thank the owners and crew of the “Professor Molchanov” for transportation to New Island. P Catry provided useful comments on the manuscript. Funding was provided by grants from Fundação para a Ciência e a Tecnologia (BD/9356/96 and BPD/22276/05) to MCS and also by the project Albatroz (PTDC/MAR/099366/2008). We also thank the New Island Conservation Trust, Falkland Islands Government and Wildlife Conservation Society for support.
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Silva, M.C., Granadeiro, J.P., Boersma, P.D. et al. Effects of predation risk on the nocturnal activity budgets of thin-billed prions Pachyptila belcheri on New Island, Falkland Islands. Polar Biol 34, 421–429 (2011). https://doi.org/10.1007/s00300-010-0897-6
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DOI: https://doi.org/10.1007/s00300-010-0897-6