Article Abstract:
Allozyme differentiation is discussed as seen in cuttlefish, Sepia officinalis (Mollusca: Cephalopoda), from the northeast Atlantic and Mediterranean. The area has been proposed as a new phylogeographical area, but more taxa should be studied before such a designation is made. Of the cuttlefish, 11 Iberian samples showed moderate genetic differentiation explainable based on genetic differentiation between Atlantic and Mediterranean samples. Significant clines in allele frequencies were seen for 5 of 6 polymorphic loci.
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Article Abstract:
Evidence for two taxa has been found in a study of genetic differentiation of the bullhead Cottus gobio L. across Central Europe watersheds. The study used starch gel eletrophoresis and morphological chareacters on 16 of the bullhead populations over three drainage systems finding 20 of 31 screened allozyme loci to be polymorphic. Genetic variation differed considerably among populations. Likely the taxa were first separated by Pliocene-Pleistocene change paleogeographical events.
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Article Abstract:
Genetic differentiation of Baetis alpinus Pictet is discussed, relative to fragmented alpine streams. The genetic structure of 23 populations of the insects, mayflies, in the streams, some fragmented by lakes and/or reservoirs, was studied to found out whether or not lakes act as barriers to gene flow and to investigate the temporal resolution of allozyme markers
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