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Titolo:
SEX-ROLE REVERSAL AND THE ABSENCE OF EXTRA-PAIR FERTILIZATION IN WILSONS PHALAROPES
Autore:
DELEHANTY DJ; FLEISCHER RC; COLWELL MA; ORING LW;
Indirizzi:
UNIV NEVADA,DEPT BIOL BRRL314 RENO NV 89557 UNIV N DAKOTA,DEPT BIOL GRAND FORKS ND 58202 SMITHSONIAN INST,NATL ZOOL PK WASHINGTON DC 20560
Titolo Testata:
Animal behaviour
, volume: 55, anno: 1998,
parte:, 4
pagine: 995 - 1002
SICI:
0003-3472(1998)55:<995:SRATAO>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
RED-WINGED BLACKBIRDS; SPERM-STORAGE TUBULES; MALE PARENTAL CARE; GENETIC-EVIDENCE; FEMALE CONTROL; TREE SWALLOWS; PATERNITY; BIRDS; BEHAVIOR; CUCKOLDRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
57
Recensione:
Indirizzi per estratti:
Citazione:
D.J. Delehanty et al., "SEX-ROLE REVERSAL AND THE ABSENCE OF EXTRA-PAIR FERTILIZATION IN WILSONS PHALAROPES", Animal behaviour, 55, 1998, pp. 995-1002

Abstract

Extra-pair fertilizations are common in birds, which has led to greatinterest in how this phenomenon is regulated at a proximate level andhow extra-pair fertilizations, and extra-pair fertilization avoidance, shape avian social systems. In Wilson's phalaropes, Phalaropus tricolor, incubation and brood-rearing is performed exclusively by males. Males are able to real only a single brood of four during a breeding season. This suggests that males have a high level of paternity in clutches and broods under their care and, thus, that extra-pair fertilizations;are infrequent. In contrast, female social dominance, lack of territoriality and frequent interactions among breeding adults suggest that both males and females have the opportunity to engage in extra-pair copulations. Using DNA fingerprint band-sharing between putative parents and offspring, we found no evidence of extra-pair fertilizations among 51 offspring from 17 families of phalaropes. Copulation disruptionby noncopulatory adults, ability of females to reject copulation attempts and potential fitness benefits to females by avoiding extra-pair fertilizations were sufficient to explain the absence of extra-pair fertilizations in Wilson's phalaropes. We propose that sex-role reversalaffects the relative costs and benefits to females of seeking extra-pair fertilizations. At the time of clutch completion, females have invested particularly heavily in their clutches due to intense competition among females to gain and keep a mate during the pre-laying and laying periods. After clutch completion, nest success requires significantmale parental care. Benefits to females in gaining extra-pair fertilizations may be offset by the risk of losing male parental care. (C) 1998 The Association for the Study of Animal Behaviour.

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Documento generato il 28/11/20 alle ore 04:41:21