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Titolo:
A tale of two strategies: Life-history aspects of family strife
Autore:
Forbes, S; Mock, DW;
Indirizzi:
Univ Winnipeg, Dept Biol, Winnipeg, MB R3B 2E9, Canada Univ Winnipeg Winnipeg MB Canada R3B 2E9 ol, Winnipeg, MB R3B 2E9, Canada Univ Oklahoma, Dept Zool, Norman, OK 73019 USA Univ Oklahoma Norman OK USA 73019 lahoma, Dept Zool, Norman, OK 73019 USA
Titolo Testata:
CONDOR
fascicolo: 1, volume: 102, anno: 2000,
pagine: 23 - 34
SICI:
0010-5422(200002)102:1<23:ATOTSL>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
AMERICAN WHITE PELICAN; BROOD REDUCTION HYPOTHESIS; INSURANCE-EGG HYPOTHESIS; HATCHING ASYNCHRONY; CLUTCH-SIZE; SIBLING AGGRESSION; PARENTAL OPTIMISM; OFFSPRING QUALITY; ALTRICIAL BIRDS; EVOLUTION;
Keywords:
brood reduction; insurance; over-production; siblicide;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
78
Recensione:
Indirizzi per estratti:
Indirizzo: Mock, DW Univ Winnipeg, Dept Biol, 515 Portage Ave, Winnipeg, MB R3B 2E9, Canada Univ Winnipeg 515 Portage Ave Winnipeg MB Canada R3B 2E9 , Canada
Citazione:
S. Forbes e D.W. Mock, "A tale of two strategies: Life-history aspects of family strife", CONDOR, 102(1), 2000, pp. 23-34

Abstract

Breeding birds can generally be thought of as having evolved life-history traits that tend to maximize lifetime reproductive success. Within this broad pattern, many variations are possible because all traits are co-evolved with numerous others in complex ways. Clutch-size, for example, has long been understood to be frequently lower than the number of young parents are capable of supporting by working at their top capacity, especially in long-lived species. Nevertheless, studies of species with fatal competition amongnestmates have shown that parents routinely create one offspring more thanthey normally will raise, as if counting on brood-reduction to trim familysize after hatching. Three general and mutually compatible parental incentives for initial over-production have been identified, with David Lack's resource-tracking hypothesis having received the most attention. Extra sibs can also assist each other in some circumstances, but a third explanation for over-production that has been around for nearly four decades, the insurance hypothesis, has been surprisingly overlooked and, in some casts, actively challenged. It simply posits that parents create extra offspring as back-ups for members of the core brood that chance to die very early. We proposed that the skepticism over thr role of insurance is misdirected that havinga back-up is virtually automatic as a contributing incentive to parents and, in some taxa, that it provides a necessary and totally sufficient explanation for over-production. Some empirical approaches to the study of the insurance hypothesis are reviewed, in hopes of encouraging further field study of over-production in general, because that process underlies much of theinternal conflict observed in avian families.

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Documento generato il 30/11/20 alle ore 16:17:19