Sex-role reversal and the absence of extra-pair fertilization in Wilson's phalaropes
Article Abstract:
Incubation and brood-rearing is done only by males in Wilson's phalaropes, Phalaropus tricolor. Males can rear only a single brood of four during a breeding season. This indicates that males have a high level of paternity in clutches and broods under their care and, therefore, extra-pair fertilizations are rare. DNA fingerprint band-sharing between putative parents and offspring, showed no proof for extra-pair fertilizations among 51 offspring from 17 families of phalaropes. This may be due to copulation disruption by non-copulatory adults, female rejection of copulatory attempts and possible fitness advantages to females which avoid extra-pair fertilizations.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1998
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DNA fingerprints similarity between female and juvenile brown-headed cowbirds trapped together
Article Abstract:
Adult cowbirds associate with juveniles and to some extent their own offspring which possibly learn to function as cowbirds, in part, from their association. The study on cowbirds, Molothrus ater, shows remarkable overall band-sharing for the individuals trapped together than for the pairing in random. Juvenile cowbirds and their mothers' association takes place due to the female cowbirds watching the development of their young in the nest where they have laid. One after the other, nestling cowbirds in the nest could become visually and vocally familiar with female parent that is often present in their territory.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1995
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Proximate factors associated with high levels of extraconsort fertilization in polygynous grey seals
Article Abstract:
Three factors that might influence the frequency of extra-consort fertilization (ECF) in grey seals were examined. These were the location of females with regard to the shoreline, their age and length of time the consort male associated with the female before becoming receptive. It is likely that ECFs in the grey seal females are the result of forced copulations by aggressive males or due to submission to copulation attempts to avoid injury.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1999
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