Port, Markus

[["dc.bibliographiccitation.firstpage","787"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","The American Naturalist"],["dc.bibliographiccitation.lastpage","800"],["dc.bibliographiccitation.volume","178"],["dc.contributor.author","Port, Markus"],["dc.contributor.author","Kappeler, Peter"],["dc.contributor.author","Johnstone, Rufus A."],["dc.date.accessioned","2017-09-07T11:49:01Z"],["dc.date.available","2017-09-07T11:49:01Z"],["dc.date.issued","2011"],["dc.description.abstract","The evolution of group living has attracted considerable attention from behavioral ecologists working on a wide range of study species. However, theoretical research in this field has been largely focused on cooperative breeders. We extend this line of work to species that lack alloparental care (hereafter termed “noncooperative species”) but that may benefit from grouping by jointly defending a common territory. We adopt a demographically explicit approach in which the rates of births and deaths as well as the dispersal decisions of individuals in the population determine the turnover rates of territories and the competition for breeding vacancies thus arising. Our results reveal that some of the factors thought to affect the evolution of cooperative breeding also affect the evolution of group living in noncooperative species. Specifically, high fecundity and low mortality of resident individuals both increase the degree of habitat saturation and make joining an established group more profitable for nonresidents (floaters). Moreover, if floaters can forcefully take over territories, the degree of habitat saturation also affects the chance that residents become targets of takeovers. In this situation, communal defense of territories becomes an important benefit that further promotes the evolution of group living."],["dc.identifier.doi","10.1086/662672"],["dc.identifier.gro","3150934"],["dc.identifier.pmid","22089872"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/7736"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0003-0147"],["dc.title","Communal Defense of Territories and the Evolution of Sociality"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","620"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Biology Letters"],["dc.bibliographiccitation.lastpage","622"],["dc.bibliographiccitation.volume","6"],["dc.contributor.author","Port, Markus"],["dc.contributor.author","Johnstone, Rufus A."],["dc.contributor.author","Kappeler, Peter"],["dc.date.accessioned","2017-09-07T11:48:30Z"],["dc.date.available","2017-09-07T11:48:30Z"],["dc.date.issued","2010"],["dc.description.abstract","The evolution of group-living has fascinated but also puzzled researchers from the inception of behavioural ecology. We use a simple optimality approach to examine some of the costs and benefits of group-living in redfronted lemurs (Eulemur fulvus rufus). We show that dominant males profit from accepting subordinates within their groups, as the latter significantly decrease the likelihood that the group is taken over by intruders. This benefit is large enough to outweigh the costs of reproductive competition and may constitute the driving force behind the evolution of multi-male associations in this species."],["dc.identifier.doi","10.1098/rsbl.2010.0091"],["dc.identifier.gro","3150835"],["dc.identifier.pmid","20236969"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/7628"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","1744-9561"],["dc.title","Costs and benefits of multi-male associations in redfronted lemurs (Eulemur fulvus rufus)"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1209"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Ecology and Evolution"],["dc.bibliographiccitation.lastpage","1218"],["dc.bibliographiccitation.volume","3"],["dc.contributor.author","Port, Markus"],["dc.contributor.author","Johnstone, Rufus A."],["dc.date.accessioned","2018-11-07T09:25:11Z"],["dc.date.available","2018-11-07T09:25:11Z"],["dc.date.issued","2013"],["dc.description.abstract","Recent theory in social evolution has been mainly concerned with competition and cooperation within social groups of animals and their impact on the stability of those groups. Much less attention has been paid to conflicts arising as a result of solitary floaters (outsiders) attempting to join groups of established residents (insiders). We model such conflicts over group-membership using a demographically explicit approach in which the rates of births and deaths in a population determine the availability of group-vacancies and the number of floaters competing over these vacancies. We find that the outcome of within-group competition, reflected in the partitioning of reproduction among group members, exerts surprisingly little influence on the resolution of insider-outsider conflict. The outcome of such conflict is also largely unaffected by differences in resource holding potential between insiders and outsiders. By contrast, whether or not groups form is mainly determined by demographic factors (variation in vital rates such as fecundity and mortality) and the resulting population dynamics. In particular, at high floater densities territory defense becomes too costly, and groups form because insiders give in to the intruder pressure imposed on them by outsiders. We emphasize the importance of insider-outsider conflicts in social evolution theory and highlight avenues for future research."],["dc.description.sponsorship","German Research Foundation (DFG) [PO 1478/1]"],["dc.identifier.doi","10.1002/ece3.533"],["dc.identifier.isi","000318802500007"],["dc.identifier.pmid","23762508"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/30003"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","2045-7758"],["dc.title","Facing the crowd: intruder pressure, within-group competition, and the resolution of conflicts over group-membership"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","889"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Behavioral Ecology"],["dc.bibliographiccitation.lastpage","897"],["dc.bibliographiccitation.volume","23"],["dc.contributor.author","Port, Markus"],["dc.contributor.author","Johnstone, Rufus A."],["dc.contributor.author","Kappeler, Peter"],["dc.date.accessioned","2017-09-07T11:48:28Z"],["dc.date.available","2017-09-07T11:48:28Z"],["dc.date.issued","2012"],["dc.description.abstract","Theoretical advances in the study of social evolution have highlighted the importance of studying group formation in conjunction with population dynamics. To address this need, a number of demographically explicit models have been developed. We parameterize such a model to study the evolution of multimale associations in Verreaux's sifaka (Propithecus verreauxi), a diurnal lemur living in small multimale–multifemale groups. We use long-term demographic data from a population in western Madagascar to estimate the fitness prospects of different male behavioral strategies. Our results indicate that dispersing male sifaka, rather than searching for a breeding territory of their own (floating), do better joining an established group as a subordinate with limited reproductive opportunities, mainly because they may later ascend to the dominant position. By contrast, resident males should not accept potential immigrants because we could not find any measurable benefit of living in a multimale group for them. There is thus a conflict over group membership between resident and floater males, and we suggest that floaters at least occasionally win this conflict because they have more to gain from joining than residents stand to lose by sharing their territory."],["dc.identifier.doi","10.1093/beheco/ars053"],["dc.identifier.gro","3150838"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/7632"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","1045-2249"],["dc.subject","ecological constraints; group-living; Propithecus verreauxi; social evolution; social queuing"],["dc.title","The evolution of multimale groups in Verreaux's sifaka, or how to test an evolutionary demographic model"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]