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Title: Genetic relatedness in marine flatfish
Author: Galleguillos Gonzalez, R. A.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1981
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The evolutionary relationships between six species of marine flatfishes belonging to the Pleuronectidae family were studied using gel electrophoresis. Observed heterozygosities ranged between 0.057 - 0.038 and 0.102 - 0.026. The total numbers of loci scored encoding for enzymes and other proteins were between 31 and 46. At the same time levels of genetic differentiation, D, were determined between populations at different stages of evolutionary divergence as follows: geographic populations, D 0.99 to 0.001; Subspecies, D 0.90 to 0.008; Species D 0.54; Genera, D 0.34 to 0.019. Populations of Platichth s flesus from the Atlantic, Adriatic and Black Seas were studied from both morphologica and electrophoretic aspects. Levels of genetic differentiation between populations from the Adriatic and Black Seas are in the range of those characterizing subspecies, and the enzyme characters discriminate between the subspecies better than do morphological characters. The presence of hybrids between P. flesus flesus and Pleuronectes platessa was confirmed, but levels of introgression between the species are very rare or non existent. The analysis of gene frequencies at polymorphic loci in Pleuronectes lap tessa established differences between populations from the Eastern and Western regions in the British Isles. In two species, Platichth s flesus flesus and Microstomus kitt the hypothesis that heterozygosity at single loci are ed to the variance in two meristic characters is not supported.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available