期刊
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 277, 期 1694, 页码 2667-2673出版社
ROYAL SOC
DOI: 10.1098/rspb.2010.0039
关键词
inbreeding; inbreeding depression; fitness; mammals; dolphins
资金
- NSF [0316800, 9753044]
- Georgetown University
- Monkey Mia Dolphin Research Foundation
- Australian Research Council
- WV Scott Foundation
- National Geographic Society
- Seaworld Research and Rescue Foundation
- Schultz-Stiftung
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [0918308] Funding Source: National Science Foundation
- Division Of Behavioral and Cognitive Sci
- Direct For Social, Behav & Economic Scie [941487] Funding Source: National Science Foundation
In wild populations, inbreeding tolerance is expected to evolve where the cost of avoidance exceeds that of tolerance. We show that in a wild population of bottlenose dolphins found in East Shark Bay, Western Australia, levels of inbreeding are higher than expected by chance alone, and demonstrate that inbreeding is deleterious to female fitness in two independent ways. We found that inbred females, and females with inbred calves, have reduced fitness (lower calving success). We further show that one of the costs of inbreeding is extended weaning age, and that females' earlier calves are more likely to be inbred. While the exact causes of inbreeding remain obscure, our results indicate that one factor is female age, and thus experience. Any inbreeding avoidance mechanisms such as female evasion of kin, or male dispersal, do not seem to be completely effective in this population, which supports the view that inbreeding avoidance does not always evolve wherever inbreeding incurs a cost.
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