Evolution of genetic variability in a population of the edible snail, Helix aspersa Muller, undergoing domestication and short-term selection

Article Abstract:

Evolution of genetic variability has been studied in six successive generation of a population originating from wild Helix aspersa. Short-term selection and domestication were of interest. In the first three no artificial selection was used, but in the next three a control line selected for greater adult weight was reared. A pedigree analysis was carried out. Results, the drop in the effective number of ancestors, were consistent with the theory of selection and the Bulmer effect.

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Genetic differentiation reflects geological history in the Azorean land snail, Leptaxis azorica

Article Abstract:

Research has been conducted on Azorian land snail Leptaxis azorica. The authors have investigated this snail via the use of morphometric and electrophoretic analysis, and they suggest that genetic distances indicate the presence of distinct lineages, and that these distances are compatible with the colonization proceeding from the eastern islands to the west.

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Gene flow between arrhenotokous and thelytokous populations of Venturia canescens (Hymenoptera)

Article Abstract:

Research has been conducted on arrhenotokously and thelytokously reproducing individuals of parasitois wasp Venturia canescens (Hymenoptera). The authors demonstrate that thelytokous wasps can mate, receive and use sperm of arrhenotokous males, and they report the occurrence of gene flow from the arrhenotokous to the thelytokous mode.

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