The NSS Bulletin - ISSN 1090-6924
Volume 45 Number 4: 81-85 - October 1983

A publication of the National Speleological Society

Introgressive Hybridization in the Astyanax fasciatus (Pisces: Characidae) Population at La Cueva Chica
Aldemaro Romero


Results of morphological studies on a population of the characid Astyanax fasciatus at La Cueva Chica, San Luís de Potosí, Mexico, suggest that the current population is the result of introgression between a blind depigmented population at that cave locality and eyed pigmented fish from a nearby surface population. A systhesis of morphological data with previous breeding, electrophoretic, karyotypic, and behavioral information is made in order to assess how much and in what respects the cave population resembes other natural populations of hybrid fish. Current ideas on the relationship between genetic and phenotypic differentiation of cave populations form their surface ancestor are also discussed.

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