No evidence for parallel sympatric speciation in cichlid species of the genus Pseudotropheus from north-western Lake Malawi.
J Evol Biol
; 16(1): 37-46, 2003 Jan.
Article
en En
| MEDLINE
| ID: mdl-14635878
To test the hypothesis of parallel speciation by sexual selection, we examined length variation at six microsatellite loci of samples from four sites of four to six putative species belonging to two subgenera of rocky shore mbuna cichlids from Lake Malawi. Almost all fixation indices were significantly different from zero, suggesting that there is presently little or no gene flow among allopatric populations or sympatric species. Analysis of variance indicated that genetic distances among allopatric populations of putative conspecifics were significantly lower than among sympatric populations of heterospecifics. The topology of trees based on distance matrices was also largely consistent with the hypothesis that the putative species are monophyletic and have thus not evolved in parallel in their present locations. If parallel speciation does occur in Malawi cichlids, it may be on a larger spatial scale than investigated in our study.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Selección Genética
/
Conducta Sexual Animal
/
Variación Genética
/
Evolución Molecular
/
Cíclidos
Límite:
Animals
País/Región como asunto:
Africa
Idioma:
En
Revista:
J Evol Biol
Asunto de la revista:
BIOLOGIA
Año:
2003
Tipo del documento:
Article
Pais de publicación:
Suiza