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A novel mammalian social structure in Indo-Pacific bottlenose dolphins (Tursiops sp.): complex male alliances in an open social network

SprMorn 添加于 2012/4/1 11:06:40  1046次阅读 | 0次推荐 | 0个评论

Terrestrial mammals with differentiated social relationships live in ‘semi-closed groups’ that occasionally accept new members emigrating from other groups. Bottlenose dolphins (Tursiops sp.) in Shark Bay, Western Australia, exhibit a fission–fusion grouping pattern with strongly differentiated relationships, including nested male alliances. Previous studies failed to detect a group membership ‘boundary’, suggesting that the dolphins live in an open social network. However, two alternative hypotheses have not been excluded. The community defence model posits that the dolphins live in a large semi-closed ‘chimpanzee-like’ community defended by males and predicts that a dominant alliance(s) will range over the entire community range. The mating season defence model predicts that alliances will defend mating-season territories or sets of females. Here, both models are tested and rejected: no alliances ranged over the entire community range and alliances showed extensive overlap in mating season ranges and consorted females. The Shark Bay dolphins, therefore, present a combination of traits that is unique among mammals: complex male alliances in an open social network. The open social network of dolphins is linked to their relatively low costs of locomotion. This reveals a surprising and previously unrecognized convergence between adaptations reducing travel costs and complex intergroup–alliance relationships in dolphins, elephants and humans.

作 者:Randi?, Sr?an; Connor, Richard C.; Sherwin, William B.; Krützen, Michael
期刊名称: Proceedings of the Royal Society B: Biological Sciences
期卷页: 第卷 第期 ~页
学科领域:生命科学 » 动物学 » 动物生理及行为学
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原文链接:http://rspb.royalsocietypublishing.org/content/early/2012/03/20/rspb.2012.0264.abstract?sid=75a7cfb8-7fda-4231-938b-c289de000c59
DOI: 10.1098/rspb.2012.0264
ISBN: 0962-8452
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相关报道: http://paper.sciencenet.cn/htmlpaper/201241119556023409.shtm
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