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Clonal Diversity in the Unisexual Fish Poeciliopsis monacha-lucida: A Tissue Graft Analysis
Robert A. Angus and R. Jack Schultz
Vol. 33, No. 1, Part 1 (Mar., 1979), pp. 27-40
Published by: Society for the Study of Evolution
Stable URL: http://www.jstor.org/stable/2407362
Page Count: 14
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Clonal variability and the factors affecting variability were examined in populations of the hybridogenetic unisexual fish Poeciliopsis monacha-lucida from northwest Mexico. Tissue grafting, a sensitive indicator of genetic differences between individuals, was used to analyze the clonal structure of populations some distance apart and in different habitats. Fish scales were chosen as donor tissue since their use permits multiple tissue exchanges between individuals. Studies confirming the suitability of scales for grafting experiments with unisexual fishes are presented. Tissue grafting proved to be a more sensitive technqiue for detecting clonal variability in unisexual vertebrate populations than electrophoresis. A previous electrophoretic survey of 22 protein loci identified eight different phenotypes among the 30 unisexual strains used in this study. In contrast, tissue grafting revealed 18 distinct histocompatibility genotypes among the same 30 strains. The evidence indicates that multiple hybrid origins have been the most significant source of clonal variability in these unisexuals. Some of the clones identified are widespread and have existed for at least 12 years. The importance of both selective and nonselective processes in determining the clonal composition of populations are discussed.
Evolution © 1979 Society for the Study of Evolution