Opposing effects of group size on reproduction and survival

dc.contributor.authorCreel, Scott
dc.contributor.authorCreel, Nancy M.
dc.date.accessioned2018-09-10T21:28:42Z
dc.date.available2018-09-10T21:28:42Z
dc.date.issued2015-07
dc.description.abstractFor cooperative breeders, we hypothesize that the effects of group size on reproduction and survival might run in opposition if the benefits of grouping cannot be shared without cost. We tested this hypothesis by examining relationships between group size, survival, and reproduction in African wild dogs (Lycaon pictus), cooperative hunters with highly cohesive packs within which reproduction is monopolized by the dominant male and female. The production and survival of pups are known to increase with increasing pack size, but the effect of pack size on adult survival has not been examined previously. Data from 366 individuals over a period of 6 years showed that the survival of adults decreased with increasing pack size, with a 25% difference between the largest and smallest packs after controlling for the effects of age, sex, social status, year of study, and pack identity. Several tests confirmed that undetected dispersal is unlikely to have produced this pattern. These results suggest that cooperative breeding in wild dogs cannot be fully explained by mutual direct benefit, thus reinforcing the prior inference that kin selection plays an important role in the evolution of their cooperation. The results also weaken support for the hypothesis that wild dogs are extinction prone due to group-level Allee effects. More broadly, the relationship of effects of group size on survival and reproduction might be predicted by considering whether cooperation yields benefits that accrue to all group members (e.g., through cooperative vigilance) or benefits that must be apportioned to individuals (e.g., through cooperative hunting).en_US
dc.description.sponsorshipFrankfurt Zoological Society (FZS 1112/90); National Science Foundation (IBN-9419452 and IBN-9712613)en_US
dc.identifier.citationCreel, Scott, and Nancy Marusha Creel. “Opposing Effects of Group Size on Reproduction and Survival in African Wild Dogs.” Behavioral Ecology 26, no. 5 (2015): 1414–1422. doi:10.1093/beheco/arv100.en_US
dc.identifier.issn1045-2249
dc.identifier.urihttps://scholarworks.montana.edu/handle/1/14744
dc.language.isoenen_US
dc.rightsCC BY, This license lets you distribute, remix, tweak, and build upon this work, even commercially, as long as you credit the original creator for this work. This is the most accommodating of licenses offered. Recommended for maximum dissemination and use of licensed materials.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/legalcodeen_US
dc.titleOpposing effects of group size on reproduction and survivalen_US
dc.typeArticleen_US
mus.citation.extentfirstpage1414en_US
mus.citation.extentlastpage1422en_US
mus.citation.issue5en_US
mus.citation.journaltitleBehavioral Ecologyen_US
mus.citation.volume26en_US
mus.contributor.orcidCreel, Scott|0000-0003-3170-6113en_US
mus.data.thumbpage7en_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.identifier.doi10.1093/beheco/arv100en_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentEcology.en_US
mus.relation.universityMontana State University - Bozemanen_US

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