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Emma L. Taylor Dominique Blache David Groth John D. Wetherall Graeme B. Martin 《Behavioral ecology and sociobiology》2000,47(5):359-364
Parentage in emus (Dromaius novaehollandiae) was examined by microsatellite analysis using four independent loci. Of 106 chicks sampled in one breeding season from 18
nests, 54 (51%) were not fathered by the nesting male, 12 (11%) were not from the observed mate of the sitting male, and 9
(8%) represented intra-specific brood parasitism, having no alleles in common with either nest parent. Some males (11%) fathered
all chicks in their nests, but the majority showed high levels of cuckoldry. Those males commencing incubation earliest in
the season tended to have the highest levels of paternity in their own nests. These results reveal a high frequency of extra-pair
fertilisations and resultant cuckoldry in a predominantly socially monogamous bird and support recent reports which have described
the emu mating system as a complexity of polyandrous, promiscuous and monogamous behaviour. Parentage assignment of chicks
resulting from extra-pair fertilisations revealed an evenly scattered pattern of paternity that did not show any particular
male dominance in reproductive success. These results lead to a reassessment of behavioural observations of emus, the consequences
of parentage distribution, and theories about mating systems and sexual selection. The frequency of extra-pair copulations
and intra-specific brood parasitism suggests patterns of descent that differ greatly from those implied by social monogamy.
Received: 27 November 1999 / Received in revised form: 8 January 2000 / Accepted: 8 February 2000 相似文献
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