Do "helpers at the nest" increase their parents' reproductive success?
Am J Hum Biol
; 13(3): 365-73, 2001.
Article
em En
| MEDLINE
| ID: mdl-11460902
ABSTRACT
"Helpers at the nest," usually offspring of a preceding litter who contribute by feeding the young to increase the reproductive success of a breeding pair, are known in many species of birds and mammals. Although similar behaviors were described by ethnological observations in several human societies, there is a lack of data on their existence and role. This study of 794 reproductive life histories of post-menopausal Berber women of Southern Morocco aims to provide such information. Results show that the presence of "probable helpers" in the household is related to higher fertility scores and is associated with improved survival of offspring to sexual maturity. In contrast to sparse observations from other human societies, there is no indication that child caretaking would be specific to eldest daughters. Although the association between offspring survival and helping patterns seems highly probable, there is no confirmation that child caretaking per se is the relevant variable. Contrary to nonhuman helpers at the nest, workloads of children range from housekeeping to light agricultural tasks, and are not focused on assisting younger siblings. The improvement of reproductive success is probably the result of multiple interactions, among which the network of kinship would play a role at both the levels of economy and reciprocal assistance.
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Temas:
ECOS
/
Aspectos_gerais
Bases de dados:
MEDLINE
Assunto principal:
Pais
/
Reprodução
/
Núcleo Familiar
/
Cuidado da Criança
/
Fertilidade
/
Comportamento de Ajuda
Tipo de estudo:
Diagnostic_studies
Limite:
Adolescent
/
Adult
/
Child
/
Female
/
Humans
/
Male
/
Middle aged
País/Região como assunto:
Africa
Idioma:
En
Revista:
Am J Hum Biol
Assunto da revista:
BIOLOGIA
Ano de publicação:
2001
Tipo de documento:
Article
País de afiliação:
França