Population genetics of Egyptian Biomphalaria alexandrina (Gastropoda, Planorbidae)

Article Abstract:

Population genetics was used to analyze dispersal patterns of Biomphalaria alexandrina to upper Egypt. Parent-offspring analysis showed that outcrossing is the predominant mode of reproduction even though self-fertilization is possible. Upstream dispersal appears to be the main mode of spread. Allelic diversity in the snails decreased directly with the log of distance from Cairo. Some peripheral populations were also found to have varying degrees of allelic diversity reduction as compared to populations found near Cairo.

Egypt, Gastropoda, Gastropods

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Gene flow and genetic diversity in naturally fragmented metapopulations of deep-sea hydrothermal vent animals

Article Abstract:

Levels of genetic diversity in metapopulations of deep-sea hydrothermal vent animals may be determined by high rates of disturbance and position in ecological successions. The species which tend to be found most frequently at hydrothermal vent sites are those which generally occur earlier in vent communities and have higher levels of genetic variability. Low occupancy is found in species with very low levels of variability and which are found late in vent community development.

Hydrothermal vents, Animal genetics

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Population genetics and genetic variability of Bulinus globosus (Gastropoda:Planorbidae) from the two main river systems in Zimbabwe

Article Abstract:

The genetic structure of Bulinus globosus, a species of vector snails, in the Save and the Sanyati River drainage systems in Zimbabwe is affected by ecological disturbances, genetic drift, and seasonal gene flow. Ecological disturbances, such as droughts and floods, stimulate reductions in population and enhance selfing. The Save River drainage system shows a higher level of gene diversity than the Sanyati River drainage system.

Zimbabwe, Rivers, Snails

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