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Title: Genetic studies in plaice
Author: McAndrew, B. J.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1980
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The Bristol Channel population of plaice Pleuronectes platessa L. was sampled on the spawning grounds off Trevose Head and on the nursery beaches in South Wales. All fish were typed using muscle tissue and starch gel electrophoresis for the five most polymorphic enzyme loci. Attempts were made to correlate the pattern of observed genetic variability with a range of presumed fitness characteristics. The possibility that the level of heterozygosity might influence survival was examined in both juvenile and adult plaice. Changes in allele genotype frequency, single and multilocus heterozygosity and the proportion of multilocus heterozygosity classes were studied in wild and captive juvenile populations. The influence of heterozygosity on above and below average grownth rate was also studied. Age related changes in heterozygosity were also investigated in fish from this and previous studies. No consistent evidence in favour of the hypothesis that heterozygosity endows increased fitness could be found. The relationship between heterozygosity and developmental homeostasis was also studied in a range of fin ray classes at both single locus and multilocus levels. No significant trend could be found to support the hypothesis that increased heterozygosity enhanced developmental homeostasis. No consistent evidence emerged for epistatic interactions between different genotypes which might have been evidence for natural selection holding together suitable genotypic combinations. The data are discussed in the light of the modern evolutionary theory.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available