Till death (or an intruder) do us part: intrasexual-competition in a monogamous Primate

2.50
Hdl Handle:
http://hdl.handle.net/10545/293671
Title:
Till death (or an intruder) do us part: intrasexual-competition in a monogamous Primate
Authors:
Fernandez-Duque, Eduardo; Huck, Maren ( 0000-0002-7740-3903 )
Abstract:
Polygynous animals are often highly dimorphic, and show large sex-differences in the degree of intra-sexual competition and aggression, which is associated with biased operational sex ratios (OSR). For socially monogamous, sexually monomorphic species, this relationship is less clear. Among mammals, pair-living has sometimes been assumed to imply equal OSR and low frequency, low intensity intra-sexual competition; even when high rates of intra-sexual competition and selection, in both sexes, have been theoretically predicted and described for various taxa. Owl monkeys are one of a few socially monogamous primates. Using long-term demographic and morphological data from 18 groups, we show that male and female owl monkeys experience intense intra-sexual competition and aggression from solitary floaters. Pair-mates are regularly replaced by intruding floaters (27 female and 23 male replacements in 149 group-years), with negative effects on the reproductive success of both partners. Individuals with only one partner during their life produced 25% more offspring per decade of tenure than those with two or more partners. The termination of the pair-bond is initiated by the floater, and sometimes has fatal consequences for the expelled adult. The existence of floaters and the sporadic, but intense aggression between them and residents suggest that it can be misleading to assume an equal OSR in socially monogamous species based solely on group composition. Instead, we suggest that sexual selection models must assume not equal, but flexible, context-specific, OSR in monogamous species.
Affiliation:
University of Pennsylvania, Department of Anthropology; Centro de Ecologia Aplicada del Litoral, CONICET
Citation:
Till Death (Or an Intruder) Do Us Part: Intrasexual-Competition in a Monogamous Primate 2013, 8 (1):e53724 PLoS ONE
Journal:
PLoS ONE
Issue Date:
2013
URI:
http://hdl.handle.net/10545/293671
DOI:
10.1371/journal.pone.0053724
Additional Links:
http://dx.plos.org/10.1371/journal.pone.0053724
Type:
Article
ISSN:
1932-6203
Sponsors:
Wenner-Gren Foundation, L.S.B. Leakey Foundation, the National Geographic Society, National Science Foundation (BCS- 0621020), the University of Pennsylvania Research Foundation and the Zoological Society of San Diego, German Science Foundation (HU 1746-2/1)
Appears in Collections:
Biological Sciences Research Group

Full metadata record

DC FieldValue Language
dc.contributor.authorFernandez-Duque, Eduardoen
dc.contributor.authorHuck, Marenen
dc.date.accessioned2013-06-10T11:25:32Z-
dc.date.available2013-06-10T11:25:32Z-
dc.date.issued2013-
dc.identifier.citationTill Death (Or an Intruder) Do Us Part: Intrasexual-Competition in a Monogamous Primate 2013, 8 (1):e53724 PLoS ONEen
dc.identifier.issn1932-6203-
dc.identifier.doi10.1371/journal.pone.0053724-
dc.identifier.urihttp://hdl.handle.net/10545/293671-
dc.description.abstractPolygynous animals are often highly dimorphic, and show large sex-differences in the degree of intra-sexual competition and aggression, which is associated with biased operational sex ratios (OSR). For socially monogamous, sexually monomorphic species, this relationship is less clear. Among mammals, pair-living has sometimes been assumed to imply equal OSR and low frequency, low intensity intra-sexual competition; even when high rates of intra-sexual competition and selection, in both sexes, have been theoretically predicted and described for various taxa. Owl monkeys are one of a few socially monogamous primates. Using long-term demographic and morphological data from 18 groups, we show that male and female owl monkeys experience intense intra-sexual competition and aggression from solitary floaters. Pair-mates are regularly replaced by intruding floaters (27 female and 23 male replacements in 149 group-years), with negative effects on the reproductive success of both partners. Individuals with only one partner during their life produced 25% more offspring per decade of tenure than those with two or more partners. The termination of the pair-bond is initiated by the floater, and sometimes has fatal consequences for the expelled adult. The existence of floaters and the sporadic, but intense aggression between them and residents suggest that it can be misleading to assume an equal OSR in socially monogamous species based solely on group composition. Instead, we suggest that sexual selection models must assume not equal, but flexible, context-specific, OSR in monogamous species.en
dc.description.sponsorshipWenner-Gren Foundation, L.S.B. Leakey Foundation, the National Geographic Society, National Science Foundation (BCS- 0621020), the University of Pennsylvania Research Foundation and the Zoological Society of San Diego, German Science Foundation (HU 1746-2/1)en
dc.relation.urlhttp://dx.plos.org/10.1371/journal.pone.0053724en
dc.rightsArchived with thanks to PLoS ONEen
dc.subjectAotus azaraeen
dc.subjectIntrasexual competitionen
dc.subjectOperational sex ratioen
dc.subjectMonogamyen
dc.titleTill death (or an intruder) do us part: intrasexual-competition in a monogamous Primate-
dc.typeArticleen
dc.contributor.departmentUniversity of Pennsylvania, Department of Anthropologyen
dc.contributor.departmentCentro de Ecologia Aplicada del Litoral, CONICETen
dc.identifier.journalPLoS ONEen
This item is licensed under a Creative Commons License
Creative Commons
All Items in UDORA are protected by copyright, with all rights reserved, unless otherwise indicated.