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© 1996 International Society for Behavioral Ecology

research-article

Effect of food deprivation on dominance status in blue-footed booby (Sula nebouxii) broods

Miguel A. Rodriguez-Gironesa,, Hugh Drummondb and Alex Kacelnika

aEGI, Department of Zoology, South Parks Road, Oxford OX1 3PS, UK bCentro de Ecologia, Universidad Nacional Autonoma de Mexico, A.P. 70-275, 04510 D.F., Mexico

ABSTRACT

A pecking hierarchy is normally established in the usual two-chick brood of the blue-footed booby (Sula nebouxii). The senior (first-hatched) chick dominates its smaller sibling and receives a greater share of parentally provided food. Experimental broods were created by putting together two unrelated junior chicks of die same age in a vacated foster nest The state of the chicks was manipulated by a period of controlled artificial feeding so that each chick underwent a different level of food deprivation. The resulting dominance relationship depended on the relative food deprivation level of the chicks: the hungrier chick normally became dominant. However, die effect of hunger was occasionally overruled by size difference: when die hungrier chick was much smaller than its foster sibling, it was unable to gain dominance over its larger companion. Dominance status is likely to have greater value for die hungrier chick, while die cost of fighting should be lower for die larger chick. These results conform to die evolutionarily stable strategy predicted for games widi asymmetric payoff and differences in resource holding power.

Key words: asymmetric games, boobies, brood dominance, sibling competition, Sula nebouxii.


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M. A. Rodriguez-Girones, P. A. Cotton, and A. Kacelnik
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[Abstract] [Full Text] [PDF]


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