期刊
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY
卷 66, 期 3, 页码 505-517出版社
SPRINGER
DOI: 10.1007/s00265-011-1297-9
关键词
Aotus azarai; Dispersal; Evolutionary theory of the family; Night monkeys; Parent-offspring conflict; Survival
资金
- Deutsche Forschungsgemeinschaft [HU 1746/2-1]
- Wenner-Gren Foundation
- L.S.B. Leakey Foundation
- National Geographic Society
- National Science Foundation [BCS-0621020]
- University of Pennsylvania Research Foundation
- Zoological Society of San Diego
According to the Evolutionary Theory of the Family, the replacement of one pair-member by an intruder may have profound consequences for the existing offspring. Step-parents are expected to provide less care towards unrelated immatures than to genetic offspring, unless caring also serves as a mating strategy. Furthermore, because an intruder will be a potential mate for opposite-sexed offspring, relationships between offspring and same-sex parents are predicted to deteriorate. To test these predictions, we studied an Azara's owl monkey (Aotus azarai) population in Argentina exhibiting serial monogamy and bi-parental care. Since 1997, we have collected demographic data from ca. 25 groups and inter-individual distance data from ca. 150 marked individuals. First, we compared survival and dispersal age of immatures in groups with and without replacements to investigate whether parental care serves as a mating strategy. Second, we compared sex-specific age at dispersal for groups with replacement of opposite-sex parents, same-sex parents, or in stable groups in order to test whether relationships between offspring and same-sex parents deteriorated after the replacement of the other parent. Survival and dispersal ages were not negatively associated with replacements, suggesting that male care might serve, at least partly, as a mating strategy. The time lag between a replacement and the subsequent dispersal of female offspring was greater if the intruder was a male, while the offspring and same-sex parents were less often nearest neighbors after replacements than before. Our results suggest that family disruption through the replacement of a parent is not associated with decreased offspring survival or early dispersion of juveniles, but deteriorates parent-offspring relationships.
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