The costs of risky male behaviour: sex differences in seasonal survival in a small sexually monomorphic primate

Cornelia Kraus, Manfred Eberle and Peter M. Kappeler
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Cornelia Kraus: Max Planck Institute for Demographic Research, Rostock, Germany

No WP-2008-005, MPIDR Working Papers from Max Planck Institute for Demographic Research, Rostock, Germany

Abstract: Male excess mortality is widespread among mammals and frequently interpreted as a cost of sexually selected traits that enhance male reproductive success. Sex differences in the propensity to engage in risky behaviours are often invoked to explain the sex gap in survival. Here we aim to isolate and quantify the survival consequences of two potentially risky male behavioural strategies in a small sexually monomorphic primate, the grey mouse lemur Microcebus murinus: (1) Most females hibernate during a large part of the austral winter, whereas most males remain active, and (2) during the brief annual mating season males roam widely in search for receptive females. Using a 10-year capture-mark-recapture data set from a population of M. murinus in Kirindy Forest, western Madagascar, we statistically modelled sex-specific seasonal survival probabilities. Surprisingly, we did not find any evidence for direct survival benefits of hibernation – winter survival did not differ between males and females. In contrast, during the breeding season males survived less well than females (sex gap: 16%). Consistent with the “risky male behaviour”-hypothesis, the period for lowered male survival was restricted to the short mating season. Thus, sex differences in survival can be substantial even in the absence of sexual dimorphism.

JEL-codes: J1 Z0 (search for similar items in EconPapers)
Pages: 23 pages
Date: 2008
New Economics Papers: this item is included in nep-hea
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:dem:wpaper:wp-2008-005

DOI: 10.4054/MPIDR-WP-2008-005

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