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Increased food availability raises eviction rate in a cooperative breeding mammal

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Peer-reviewed

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Article

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Authors

Dubuc, C 
English, S 
Thavarajah, N 
Dantzer, B 
Sharp, SP 

Abstract

In group-living mammals, the eviction of subordinate females from breeding groups by dominants may serve to reduce feeding competition or to reduce breeding competition. Here, we combined both correlational and experimental approaches to investigate whether increases in food intake by dominant females reduces their tendency to evict subordinate females in wild meerkats (Suricata suricatta). We used 20 years of long-term data to examine the association between foraging success and eviction rate, and provisioned dominant females during the second half of their pregnancy, when they most commonly evict subordinates. We show that rather than reducing the tendency for dominants to evict subordinates, foraging success of dominant females is positively associated with the probability that pregnant dominant females will evict subordinate females and that experimental feeding increased their rates of eviction. Our results suggest that it is unlikely that the eviction of subordinate females serves to reduce feeding competition and that its principal function may be to reduce reproductive competition. The increase in eviction rates following experimental feeding also suggests that rather than feeding competition, energetic constraints may normally constrain eviction rates.

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Keywords

breeding competition, dispersal, food competition, meerkats

Journal Title

Biology Letters

Conference Name

Journal ISSN

1744-9561
1744-957X

Volume Title

13

Publisher

The Royal Society
Sponsorship
Natural Environment Research Council (NE/G006822/1)
European Research Council (294494)
The KMP is supported by the Universities of Cambridge, Zurich and Pretoria. Components of this research were supported by the Natural Environment Research Council (grant no. NE/G006822/1) and the European Research Council (grant no. 294494).