Multiple fitness peaks on the adaptive landscape drive adaptive radiation in the wild.
Science
; 339(6116): 208-11, 2013 Jan 11.
Article
em En
| MEDLINE
| ID: mdl-23307743
The relationship between phenotype and fitness can be visualized as a rugged landscape. Multiple fitness peaks on this landscape are predicted to drive early bursts of niche diversification during adaptive radiation. We measured the adaptive landscape in a nascent adaptive radiation of Cyprinodon pupfishes endemic to San Salvador Island, Bahamas, and found multiple coexisting high-fitness regions driven by increased competition at high densities, supporting the early burst model. Hybrids resembling the generalist phenotype were isolated on a local fitness peak separated by a valley from a higher-fitness region corresponding to trophic specialization. This complex landscape could explain both the rarity of specialists across many similar environments due to stabilizing selection on generalists and the rapid morphological diversification rate of specialists due to their higher fitness.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Peixes Listrados
/
Adaptação Fisiológica
/
Evolução Biológica
/
Aptidão Genética
Tipo de estudo:
Prognostic_studies
Limite:
Animals
País/Região como assunto:
Bahamas
/
Caribe ingles
Idioma:
En
Revista:
Science
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Estados Unidos
País de publicação:
Estados Unidos