Decoupling of Genetic and Cultural Inheritance in a Wild Mammal.
Curr Biol
; 28(11): 1846-1850.e2, 2018 06 04.
Article
en En
| MEDLINE
| ID: mdl-29804813
ABSTRACT
Cultural inheritance, the transmission of socially learned information across generations, is a non-genetic, "second inheritance system" capable of shaping phenotypic variation in humans and many non-human animals [1-3]. Studies of wild animals show that conformity [4, 5] and biases toward copying particular individuals [6, 7] can result in the rapid spread of culturally transmitted behavioral traits and a consequent increase in behavioral homogeneity within groups and populations [8, 9]. These findings support classic models of cultural evolution [10, 11], which predict that many-to-one or one-to-many transmission erodes within-group variance in culturally inherited traits. However, classic theory [10, 11] also predicts that within-group heterogeneity is preserved when offspring each learn from an exclusive role model. We tested this prediction in a wild mammal, the banded mongoose (Mungos mungo), in which offspring are reared by specific adult carers that are not their parents, providing an opportunity to disentangle genetic and cultural inheritance of behavior. We show using stable isotope analysis that young mongooses inherit their adult foraging niche from cultural role models, not from their genetic parents. As predicted by theory, one-to-one cultural transmission prevented blending inheritance and allowed the stable coexistence of distinct behavioral traditions within the same social groups. Our results confirm that cultural inheritance via role models can promote rather than erode behavioral heterogeneity in natural populations.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Evolución Cultural
/
Herencia
/
Herpestidae
Tipo de estudio:
Prognostic_studies
Límite:
Animals
País/Región como asunto:
Africa
Idioma:
En
Revista:
Curr Biol
Asunto de la revista:
BIOLOGIA
Año:
2018
Tipo del documento:
Article
País de afiliación:
Reino Unido