RESUMO
This study reports for the first time the roles of genetic and body phenotypic variation in two Saccodon dariensis dental morphs. Results showed a lack of ancient mitochondrial differentiation between morphs and body variations concordant with genetic polymorphism or differential plastic responses to diet quality and foraging strategies of S. dariensis.
Assuntos
Caraciformes/genética , Acrilatos , Animais , Caraciformes/anatomia & histologia , Caraciformes/fisiologia , Colômbia , Comportamento Alimentar , Feminino , Boca/anatomia & histologia , Fenótipo , Éteres Fenílicos , Filogenia , Polimorfismo Genético , Análise de Sequência de DNA , Caracteres Sexuais , Dente/anatomia & histologiaRESUMO
Landmark-based geometric morphometrics were used to evaluate the effect of flow and depth in the water column on the body size and shape of Brycon henni from river and stream populations. The dendrogram showed that stream populations clustered apart and showed significantly smaller centroid size and narrower bodies than river populations, indicating a role for flow and depth on whole body morphometric variation. The results are concordant with morphometric variation described in other fish species and provide the first insights into phenotypic variation in natural populations of B. henni.