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Genotypic and Environmental Components of Variation in Growth and Reproduction of Fish Hemiclones (Poeciliopsis: poecilidae)
Jeffrey D. Wetherington, Stephen C. Weeks, Karen E. Kotora and Robert C. Vrijenhoek
Vol. 43, No. 3 (May, 1989), pp. 635-645
Published by: Society for the Study of Evolution
Stable URL: http://www.jstor.org/stable/2409065
Page Count: 11
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The frozen-niche-variation model was proposed to account for the coexistence of genetically related clones in naturally occurring unisexual populations. This model is based on two assumptions: 1) ecologically different clones have multiple independent origins from sexual ancestors; and 2) the population of sexual ancestors contains genetic variability for ecologically relevant traits. To test these assumptions, we produced 14 new "hemiclones" (nonrecombining haploid genotypes) of fish (Poeciliopsis: Poeciliidae). Our ability to synthesize many new hemiclones demonstrates the feasibility of multiple independent origins of nonrecombining genotypes. A substantial proportion (10-50%) of the phenotypic variation among hemiclones in size at birth, juvenile growth rate, and fecundity had a genetic basis. Thus, we conclude that multiple origins can give rise to an assemblage of genetically distinct hemiclones, each with a unique combination of life-history traits. Additionally, a comparative analysis of two natural hemiclones revealed that the synthetic strains represent a broad field of variation from which natural hemiclones can be selected.
Evolution © 1989 Society for the Study of Evolution