Intermediate Kinematics Produce Inferior Feeding Performance in a Classic Case of Natural Hybridization.
Am Nat
; 186(6): 807-14, 2015 Dec.
Article
em En
| MEDLINE
| ID: mdl-26655987
ABSTRACT
Selection on naturally occurring hybrid individuals is a key component of speciation theory, but few studies examine the functional basis of hybrid performance. We examine the functional consequences of hybridization in nature, using the freshwater sunfishes (Centrarchidae), where natural hybrids have been studied for more than a century and a half. We examined bluegill (Lepomis macrochirus), green sunfish (Lepomis cyanellus), and their naturally occurring hybrid, using prey-capture kinematics and morphology to parameterize suction-feeding simulations on divergent parental resources. Hybrid individuals exhibited kinematics intermediate between those of the two parental species. However, performance assays indicated that hybrids display performance most similar to the worse-performing species for a given parental resource. Our results show that intermediate hybrid phenotypes can be impaired by a less-than-intermediate performance and hence suffer a larger loss in fitness than could be inferred from morphology alone.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Perciformes
/
Hibridização Genética
Limite:
Animals
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article