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Determinants of immigration strategies in male crested macaques (Macaca nigra).

Engelhardt, A and Marty, PR and Hodges, JK (2016) Determinants of immigration strategies in male crested macaques (Macaca nigra). Scientific Reports, 6. ISSN 2045-2322

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Abstract

Immigration into a new group can produce substantial costs due to resistance from residents, but also reproductive benefits. Whether or not individuals base their immigration strategy on prospective costbenefit ratios remains unknown. We investigated individual immigration decisions in crested macaques, a primate species with a high reproductive skew in favour of high-ranking males. We found two different strategies. Males who achieved low rank in the new group usually immigrated after another male had immigrated within the previous 25 days and achieved high rank. They never got injured but also had low prospective reproductive success. We assume that these males benefitted from immigrating into a destabilized male hierarchy. Males who achieved high rank in the new group usually immigrated independent of previous immigrations. They recieved injuries more frequently and therefore bore immigration costs. They, however, also had higher reproductive success prospects. We conclude that male crested macaques base their immigration strategy on relative fighting ability and thus potential rank in the new group i.e. potential reproductive benefits, as well as potential costs of injury.

Item Type: Article
Subjects: Q Science > QH Natural history
Divisions: Natural Sciences and Psychology
Publisher: Nature Publishing Group
Date Deposited: 11 Nov 2016 11:23
Last Modified: 11 Nov 2016 11:23
DOI or Identification number: 10.1038/srep32028
URI: http://researchonline.ljmu.ac.uk/id/eprint/4791

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