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Genotype Diversity and Selection in Asexual Brine Shrimp (Artemia)
Robert A. Browne and Charles W. Hoopes
Vol. 44, No. 4 (Jul., 1990), pp. 1035-1051
Published by: Society for the Study of Evolution
Stable URL: http://www.jstor.org/stable/2409565
Page Count: 17
You can always find the topics here!Topics: Genotypes, Artemia, Salinity, Genetics, Ponds, Phenotypic traits, Evolution, Ecological life histories, Population ecology, Ecological genetics
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An obligately asexual population of Artemia parthenogenetica at Salin de Giraud, France consists of numerous clones that are genetically and ecologically divergent. The clones are distributed in a nonrandom fashion among eight ponds of highly variable environments. A total of 63 allozymically unique genotypes were identified, with significant differences in numerous fitness traits found among a sample subset of clones. The frequencies of four alleles, as well as the percentage of loci polymorphic, were significantly correlated with salinity. Genotypes face rapid selection along salinity gradients in the field and this selection is reproducible in the lab. mtDNA analysis suggests that obligate asexuality in this population is of monophyletic origin.
Evolution © 1990 Society for the Study of Evolution