Sex, linkage disequilibrium and patterns of parasitism in three species of cyclically parthenogenetic Daphnia (Cladocera: Crustacea)

Article Abstract:

Three species of cyclically parthenogenetic Daphnia (Cladocera: Crustacea) have been studied relative to sex, linkage disequilibrium and patterns of parasitism. Results may underestimate the prevalence of clonal variation for infection, especially for D. magna, in that most of the populations analyzed seem to have high levels of sexual recruitment and thus lack linkage disequilibrium that is the basis of associations between allozymes and susceptibility.

Switzerland, Natural selection, Cloning, Parthenogenesis, Natural immunity

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Wolbachia diversity in the Porcellionides pruinosus complex of species (Crustacea: Oniscidea): evidence for host-dependent patterns of infection

Article Abstract:

A study has been carried out to look for genetic differentiation in hosts, Porcellionides pruinosus, a cosmopolitan woodlouse, and parasites, Wolbachia, and also to find the infection patterns in the host populations. Nine populations described as P. pruinosus and having different Wolbachia strains were studied to look for possible coevolution. P. pruinosis is thought to consist of several very closely related species.

France, Symbiosis, Insects, Evolution (Biology), Evolution, Phylogeny, Wolbachia

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A linkage analysis of sex determination in Bombus terrestris (L.) (Hymenoptera: Apidea)

Article Abstract:

A linkage analysis of sex determination has been carried out in Bombus terrestris (L.) (Hymenoptera: Apidea). Chromosome size, male haploidy and eusociality have been shown not to be reasons for the high recombination frequency of Apis mellifera, the honey bee. The sex determination locus of B. terrestris was put on the map using bulked segregant analysis.

United States, Reports, Chromosome mapping, Genetic research, Bees, Sex determination, Genetic, Sex determination (Genetics), Hymenoptera, Diploidy

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