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Vigilance benefits and competition costs in groups:: do individual redshanks gain an overall foraging benefit?
School of Biology, University of St. Andrews.
School of Biology, University of St. Andrews.
School of Biology & Psychology, Newcastle University.
Stockholm University. Stockholm University, Faculty of Humanities, Centre for the Study of Cultural Evolution. Stockholm University, Faculty of Science, Department of Zoology, Department of Ethology.
2008 (English)In: Animal Behaviour, ISSN 0003-3472, Vol. 75, 1869-1875 p.Article in journal (Refereed) Published
Abstract [en]

Animals gain antipredation benefits from being in larger groups through increased probability of predator detection, dilution of individual risk of being attacked and confusion of predators during attack. A further benefit is that individuals in larger groups can decrease the amount of time they spend being vigilant, while maintaining a high probability of predator detection. They may then gain extra time to forage, so increasing overall intake rate. Increasing group size, however, can also increase competition so that intake rates decrease. We investigated whether there was a foraging benefit in redshanks, Tringa totanus, that show the group size decrease in individual vigilance. Intake rates did not change with group size, despite an increase in time spent foraging. Interference competition increased with group size because individuals travelled more to find prey. Redshanks used the extra time available to forage to maintain intake rates under increased competition. Although the group size effect on vigilance did not accrue direct foraging benefits, larger groups formed, conferring other antipredation benefits. Intake rates were maintained because the interference competition was compensated by the benefits of reduced individual vigilance.

Place, publisher, year, edition, pages
2008. Vol. 75, 1869-1875 p.
Keyword [en]
antipredation, group size effect, interference competition, predator detection, redshank, Tringa totanus
URN: urn:nbn:se:su:diva-15749DOI: 10.1016/j.anbehav.2007.11.005ISI: 000256708500008OAI: diva2:182269
Available from: 2008-12-09 Created: 2008-12-09 Last updated: 2009-12-03Bibliographically approved

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Lind, Johan
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Stockholm UniversityCentre for the Study of Cultural EvolutionDepartment of Ethology
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