Mass, Vanessa

[["dc.bibliographiccitation.firstpage","487"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","American Journal of Physical Anthropology"],["dc.bibliographiccitation.lastpage","497"],["dc.bibliographiccitation.volume","140"],["dc.contributor.author","Kappeler, Peter"],["dc.contributor.author","Mass, Vanessa"],["dc.contributor.author","Port, Markus"],["dc.date.accessioned","2017-09-07T11:48:21Z"],["dc.date.available","2017-09-07T11:48:21Z"],["dc.date.issued","2009"],["dc.description.abstract","Optimal group size and composition are determined by both the costs and benefits of group living for the group's members. Verreaux's sifakas (Propithecus verreauxi), a diurnal lemur, form multimale multifemale groups with the tendency toward even adult sex ratios despite a small average number of females per group. The unexpected presence of multiple adult males may be explained by tolerance of other group members if subordinate males provide benefits to the group that outweigh the costs associated with their presence. Results based on both demographic data collected over a 13-year period and behavioral observations suggest that subordinate males provide no benefits in terms of infant survival and defense against group takeover by outside males. Although groups with more males are more likely to win intergroup encounters, subordinate males do not participate in these encounters more often than expected. Subordinate males are not costly to other group members in terms of direct intragroup feeding competition, but aggression rates between dominant and immigrated subordinate males increase in the mating season. Even though subordinate males provide very few benefits to the group, they are not very costly either and thus may be tolerated by resident females and dominant males. This tolerance may help to partially explain the tendency towards their unusual adult sex ratio."],["dc.identifier.doi","10.1002/ajpa.21091"],["dc.identifier.gro","3150775"],["dc.identifier.pmid","19425098"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/7565"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0002-9483"],["dc.title","Even adult sex ratios in lemurs: Potential costs and benefits of subordinate males in Verreaux's sifaka (Propithecus verreauxi) in the Kirindy Forest CFPF, Madagascar"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","361"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Folia Primatologica"],["dc.bibliographiccitation.lastpage","361"],["dc.bibliographiccitation.volume","79"],["dc.contributor.author","Mass, Vanessa"],["dc.contributor.author","Kappeler, Peter"],["dc.date.accessioned","2018-03-22T13:09:55Z"],["dc.date.available","2018-03-22T13:09:55Z"],["dc.date.issued","2008"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/13117"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.title","The role of subordinate males in Propithecus verreauxi verreauxi in the Kirindy forest, Madagascar"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","389"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","International Journal of Primatology"],["dc.bibliographiccitation.lastpage","409"],["dc.bibliographiccitation.volume","30"],["dc.contributor.author","Mass, V."],["dc.contributor.author","Heistermann, M."],["dc.contributor.author","Kappeler, Peter"],["dc.date.accessioned","2017-09-07T11:48:54Z"],["dc.date.available","2017-09-07T11:48:54Z"],["dc.date.issued","2009"],["dc.description.abstract","Sexual selection theory predicts that in group-living mammals, male reproductive tactics can lead to high reproductive skew in favor of dominant individuals. In sifakas (Propithecus verreauxi), a group-living primate with extremely seasonal reproduction, male reproductive success is highly skewed because dominant males sire almost all offspring despite a tendency toward an even adult group sex ratio. To understand the underlying behavioral mechanism resulting in this rank-related reproductive skew in male sifakas, we studied mate-guarding as a potential reproductive tactic. Behavioral observations of dominant males and adult females in combination with hormonal determination of timing of female receptivity in 9 groups at Kirindy Forest revealed that dominant males spent more time in proximity to females when they were receptive and were responsible for the maintenance of this proximity. Results also indicated that monopolization of receptive females was facilitated by both estrous asynchrony within groups and by the ability of dominant males to obtain olfactory cues as to the timing of female receptivity. Although dominant males engaging in mate-guarding are expected to experience various costs, there was no evidence for decreased foraging behavior and only a trend toward increased aggression between dominant and subordinate non-natal males within groups. Our results are in accordance with the hypothesis that dominant males use mate-guarding to monopolize receptive females and that it is one proximate mechanism that contributes to the high reproductive skew observed within the population of male sifakas at Kirindy."],["dc.identifier.doi","10.1007/s10764-009-9345-2"],["dc.identifier.gro","3150891"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/3588"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/7689"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0164-0291"],["dc.rights.access","openAccess"],["dc.subject.ddc","570"],["dc.title","Mate-Guarding as a Male Reproductive Tactic in Propithecus verreauxi"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]