Experimental evidence that group size generates divergent benefits of cooperative breeding for male and female ostriches.

ABSTRACT: Cooperative breeding allows the costs of parental care to be shared, but as groups become larger, such benefits often decline as competition increases and group cohesion breaks down. The counteracting forces of cooperation and competition are predicted to select for an optimal group size, but variation in groups is ubiquitous across cooperative breeding animals. Here, we experimentally test if group sizes vary because of sex differences in the costs and benefits of cooperative breeding in captive ostriches, Struthio camelus, and compare this to the distribution of group sizes in the wild. We established 96 groups with different numbers of males (1 or 3) and females (1, 3, 4, or 6) and manipulated opportunities for cooperation over incubation. There was a clear optimal group size for

SUBMITTER: Melgar J 

PROVIDER: S-EPMC9531942 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature