Sennhenn-Reulen, Holger

[["dc.bibliographiccitation.artnumber","e22711"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","American Journal of Primatology"],["dc.bibliographiccitation.volume","79"],["dc.contributor.author","Almeling, Laura"],["dc.contributor.author","Sennhenn-Reulen, Holger"],["dc.contributor.author","Hammerschmidt, Kurt"],["dc.contributor.author","Freund, Alexandra M."],["dc.contributor.author","Fischer, Julia"],["dc.date.accessioned","2018-03-08T09:21:20Z"],["dc.date.available","2018-03-08T09:21:20Z"],["dc.date.issued","2017"],["dc.description.abstract","Human aging is accompanied by a decrease in social activity and a narrowing in social networks. Studies in nonhuman primates may provide valuable comparative insights in which way aging impacts social life, in the absence of cultural conventions and an awareness of a limited lifetime. For female Barbary macaques at “La Forêt des Singes” in Rocamadour, France, we previously reported an age-associated decrease in active grooming time and network size. Here, we aimed to extend these findings by investigating in which way physical decline, spatial proximity, and aggression vary with age in female Barbary macaques. We analyzed >1,200 hr of focal observations for 46 females aged 5–29 years. As expected, older females engaged less frequently in challenging locomotor activity, such as climbing or running, than younger ones. The previously reported decrease in grooming time was not due to shorter grooming bout duration. Instead, active grooming bouts lasted even longer, which discounts the idea that manual fatigue explains the shift in grooming pattern. We found that older females tended to be spatially reclusive and that they were less frequently the targets of aggression. Although older females showed aggressive behaviors at similar rates as younger females, the proportion of low-level aggression (i.e., threats) increased with age. We suggest that these threats are not simply a signal of dominance, but also function to deter approaches by others. Overall, these findings are in line with the idea that older females aim to avoid potentially negative interactions, specifically if these are costly. In sum, these findings support the idea that shifts in female Barbary macaques' grooming activity, do not simply result from physical deterioration, but are instead due to a higher selectivity in the choice of social partners."],["dc.identifier.doi","10.1002/ajp.22711"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/12847"],["dc.language.iso","en"],["dc.notes.intern","GRO-Li-Import"],["dc.notes.status","final"],["dc.relation.doi","10.1002/ajp.22711"],["dc.relation.issn","0275-2565"],["dc.title","Social interactions and activity patterns of old Barbary macaques: Further insights into the foundations of social selectivity"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1744"],["dc.bibliographiccitation.issue","13"],["dc.bibliographiccitation.journal","Current Biology"],["dc.bibliographiccitation.lastpage","1749"],["dc.bibliographiccitation.volume","26"],["dc.contributor.author","Almeling, Laura"],["dc.contributor.author","Hammerschmidt, Kurt"],["dc.contributor.author","Sennhenn-Reulen, Holger"],["dc.contributor.author","Freund, Alexandra M."],["dc.contributor.author","Fischer, Julia"],["dc.date.accessioned","2017-09-07T11:47:15Z"],["dc.date.available","2017-09-07T11:47:15Z"],["dc.date.issued","2016"],["dc.description.abstract","As humans age, they become more selective regarding their personal goals [1] and social partners [2]. Whereas the selectivity in goals has been attributed to losses in resources (e.g., physical strength) [3], the increasing focus on emotionally meaningful partners is, according to socioemotional selectivity theory, driven by the awareness of one's decreasing future lifetime [2]. Similar to humans, aging monkeys show physical losses [4] and reductions in social activity [2, 5-7]. To disentangle a general resource loss and the awareness of decreasing time, we combined field experiments with behavioral observations in a large age-heterogeneous population of Barbary macaques (Macaca sylvanus) at La Forêt des Singes. Novel object tests revealed a loss of interest in the nonsocial environment in early adulthood, which was modulated by the availability of a food reward. Experiments using vocal and visual representations of social partners indicated that monkeys maintained an interest in social stimuli and a preferential interest in friends and socially important individuals into old age. Old females engaged in fewer social interactions, although other group members continued to invest in relationships with them. Consequently, reductions in sociality were not due to a decrease in social interest. In conclusion, some of the motivational shifts observed in aging humans, particularly the increasing focus on social over nonsocial stimuli, may occur in the absence of a limited time perspective and are most likely deeply rooted in primate evolution. Our findings highlight the value of nonhuman primates as valuable models for understanding human aging [8, 9]."],["dc.identifier.doi","10.1016/j.cub.2016.04.066"],["dc.identifier.gro","3150649"],["dc.identifier.pmid","27345168"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/7428"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0960-9822"],["dc.title","Motivational Shifts in Aging Monkeys and the Origins of Social Selectivity"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]