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Colour polymorphism and genetic variation in Idotea baltica populations from the Adriatic Sea and Baltic Sea

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Abstract

Phenotypic and genetic variation was studied in two of the four European subspecies of the marine isopod Idotea baltica; the Mediterranean I. b. basteri and the Baltic I. b. baltica. Spatial and temporal patterns of colour polymorphism were analysed in northern Adriatic and western Baltic Sea populations. Pronounced differences in phenotype composition were observed between populations of both subspecies as seen in the distribution of various colour variants bilineata, lineata, flavafusca and several combined forms). Compared with Adriatic samples, western Baltic Sea populations show higher phenotypic diversity. To obtain an estimate of the degree of genetic divergence between the subspecies, 12 gene-enzyme systems were investigated electrophoretically. The results obtained indicate a relatively high level of genetic variation; I. b. basteri from the nothern Adriatic tends to be more polymorphic and more heterozygous than I. b. baltica from the western Baltic. Both subspecies share identical electrophoretic mobilities of the homologous enzyme proteins examined; however, in allelic composition they exhibit significant differences at approximately half the number of loci scored. The genetic distance (Nei's D) measured at the subspecific level was 0.04. Amounts and geographical patterns of variation, observed both in colour phenotype and electrophoretic variation, are considered.

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Authors and Affiliations

  1. Biologische Anstalt Helgoland (Zentrale), Notkestr. 31, D-2000, Hamburg 52, Federal Republic of Germany

    H.-P. Buinheim

  2. Istituto di Biologia del Mare, Riva 7 Martiri, I-30122, Venezia, Italy

    G. Faya

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  1. H.-P. Buinheim
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  2. G. Faya
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Buinheim, HP., Faya, G. Colour polymorphism and genetic variation in Idotea baltica populations from the Adriatic Sea and Baltic Sea. Genetica 59, 177–190 (1982). https://doi.org/10.1007/BF00056540

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  • DOI: https://doi.org/10.1007/BF00056540

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