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Genotypic characteristics of the Cladocera

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Abstract

Work on the genetics of cladocerans reproducing by cyclic parthenogenesis has indicated that populations usually include a large number of genotypes, whose frequencies are in close approximation to Hardy-Weinberg equilibrium. Less diverse genotypic arrays and pronounced instability in genotype frequencies occur only in permanent populations exposed to limited ephippial recruitment. Genetic diversification among local cladoceran populations is greater than in most other organisms as a consequence of the inefficiency of passive dispersal. Genotypic characteristics of cladocerans reproducing by obligate parthenogenesis are markedly different from those of cyclic parthenogens. Local populations include few clones, but genetic distances between them are often large and accompanied by significant ecological and morphological divergence. When considered over their entire range, cladoceran taxa reproducing by obligate asexuality are the most genotypically diverse asexual organisms known. This diversity has originated from the spread of a sex-limited meiosis suppressor through species that originally reproduced by cyclic parthenogenesis. The confused state of cladoceran taxonomy is partially a consequence of the presence of such obligately asexual groups, but also results from the occurrence of hybridization and sibling species. The genome size of cladocerans is exceptionally small and is associated with a large amount of endopolyploidy. Somatic tissues in adult cladocerans show a range in nuclear DNA content from 2–2048 c. DNA quantification studies have additionally revealed the frequent occurrence of polyploid clones in obligately asexual taxa.

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  1. Biology Dept. University of Windsor, N9B 3P4, Windsor, Ontario, Canada

    Paul D. N. Hebert

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Hebert, P.D.N. Genotypic characteristics of the Cladocera. Hydrobiologia 145, 183–193 (1987). https://doi.org/10.1007/BF02530279

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