Persistence of asexuality through mixed reproduction in Eucypris virens (Crustacea, Ostracoda)

Article Abstract:

Mixed reproduction in Eucypris virens (Crustacea, Ostracoda) and resulting persistence of asexuality are discussed. It is argued that data can only provide a lower limit on the number of origins of asexual reproduction and an upper limit on age of asexual lineages. Congruence between gene trees for different loci can give support for inferring long-term apomictic reproduction. conclusions from nuclear and mitochondrial data differ. genetic exchange would seem to have occurred between sexual and asexual lineages, which could combine benefits of both modes and explain how asexuality persisted in long evolutionary terms.

United Kingdom, Europe, Statistics, Natural history, Apomixis, Southern Europe

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Intraindividual and intraspecies variability of ITS1 sequences in the ancient asexual Darwinula Stevensoni (Crustacea: Ostracoda)

Article Abstract:

Intraindividual and intraspecies variability of ITS1 sequences has been studied in the ancient asexual Darwinula Stevensoni (Crustacea: Ostracoda), a freshwater ostracod, the only cosmopolitan species of the group. Specimens came from habitats from South Africa to Finland. Low intraspecific variability seen and observation of recombinant molecules were evaluated relative to relevant literature. The high level of variation within individuals and the occurrence of recombination without meiosis are discussed.

Italy, Statistical Data Included, Usage, Evolution (Biology), Genetic recombination, Evolution, Cladistic analysis, Heredity, Crustacea, Crustaceans

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Clonal diversity in the ancient asexual ostracod Darwinula stevensoni assessed by RAPD-PCR

Article Abstract:

Overall genotopic diversity of Darwinula stevensoni is estimated from different geographic populations, using the Random Amplified Polymorphic DNA (RADP) technique. It is observed that clonal diversity found in D. stevensoni refutes the existence of a widespread general-purpose genotype for D. stevensoni and no clonal lineage is dominant and widespread.

Science & research, Belgium, Analysis, Genetic polymorphisms

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