Multiple-locus heterozygosity, mortality, and growth in a cohort of Mytilus edulis

Diehl, Walter J.; Koehn, Richard K.

doi:10.1007/bf00392588

Cited by 83 publications

(49 citation statements)

References 14 publications

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“…Positive associations have subsequently been reported from natural populations of some other bivalves: Mytilus edulis (Koehn and Gaffney, 1984, although the relationship changed in older samples from the same cohort, Diehi and Koehn, 1985), Mulinia lateralis (Garton et a!., 1984), and for one of two populations of Macoma balthiça t Department of Human Sciences, Environmental Biology Unit, Loughborough University, Loughborough, Leicestershire, LE1 1 3TU, U.K. (Green et aL, 1983). However, Foltz and Zouros (1984) and Beaumont et aL (1985) were unable to detect any such relationship in two species of scallops, Placopecten magellanicus and Pecten maxim us respectively.…”

Section: Introductionmentioning

confidence: 88%

Growth rate and heterozygosity in the plaice, Pleuronectes platessa

1986

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Samples of young plaice were examined to see if there was any relationship between growth rate and individual heterozygosity, screened across five polymorphic enzyme loci (Pgm-1, Ada, Mdh-2, Pgi-2, aGpdh-1). Two out of 46 samples showed a significant negative correlation between growth rate and multi-locus heterozygosity; none showed a significant positive correlation. There was no overall tendency to negative or positive correlations. The largest sample (N = 689) showed no relationship between multi-locus heterozygosity and growth rate, although one of the five loci, aGpdh-1, showed a significant positive correlation. The only significant correlation in the next largest sample (N = 248) was between multi-locus heterozygosity and growth rate, and that was negative. Fish of intermediate growth rate were not significantly different in heterozygosity from faster or slower growing fish. There was no relationship between variability in growth rate and multi-locus heterozygosity. These findings are discussed in the context of similar surveys from other species, and the conclusion drawn that the universality of a positive relationship between growth rate and multi-locus heterozygosity remains to be established.

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Section: Introductionmentioning

confidence: 88%

Growth rate and heterozygosity in the plaice, Pleuronectes platessa

1986

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“…Colgan (1981) observed significant allele frequency differences in a population of the Australian beaked mussel Brachidontes rostratus at a malate dehydrogenase locus (Mdh-i) over a period of 12 months. Koehn and Gafiney (1984) and Diehl and Koehn (1985) found significant changes in allele frequencies in newly settled M. edulis spat up until the end of their first year in Long Island Sound, but did not attempt to determine if such changes occurred in other cohorts at the same time, or in subsequent years for the same cohort. M. edulis and M. galloprovincialis were first shown to occur sympatrically in the southwest of England by Lewis and Seed (1969) and Seed (1971), differentiation between the two mussel types being based mainly upon morphological, anatomical and physiological features.…”

Section: Intro D U Ctl Onmentioning

confidence: 99%

Historical and size-dependent genetic variation in hybrid mussel populations

Gardner

Skibinski

1988

Heredity

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Samples from the high and low shore were taken from mussel populations at two localities. Croyde Bay and Whitsand Bay in southwest England, within the zone of hybridisation of Mytilus edulis and Mytilus galloprovincialis, and analysed at five polymorphic allozyme loci.Strong correlations were observed between shell length and allele frequencies at both localities, with a higher frequency of alleles characterising M. galloprovincialis being found in larger mussels. Three hypotheses were considered as explanation of these results (1) differential mortality, (2) differential growth and (3) historical change within the hybrid zone. The last hypothesis was rejected because the pattern of length dependent allozyme variation was similar in samples taken in 1980-Si and 1986-87. The observation of small growth differences between M. edulis and M. galloprovincialis provided evidence against the second hypothesis. Thus, higher mortality of younger M. edulis was favoured as the cause of the length-dependent variation. Wave exposure and sand abrasion experienced by the mussels were thought to be the most likely selective factors.Strong correlations were also observed in these populations between shell length and allozyme heterozygosity. Analysis of genotype frequencies in small and large size classes of mussels provide evidence of a small added effect of heterozygosity, but no evidence of overdominance.

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“…Although available evidence certainly suggests that individual loci contribute differently to growth, these are some of the few results which suggest that heterozygosity at several loci may contribute negatively to growth; previously most studies have shown heterozygosity to contribute either positively or neutrally (but see Ledig et a!., 1983;Diehl and Koehn, 1985). Consequently the nature of the multilocus heterozygosity-growth relationship is probably more complex than previously recognized and depends greatly on the loci chosen for study and possibly on the environment to which individuals are subjected.…”

Section: Resultsmentioning

confidence: 98%

“…Thus the advantages conferred by heterozygosity appear to be of primary benefit when the environment challenges the energy balance of the individual. In M. edulis this may be manifest as improved survivorship of more heterozygous individuals during the energeticallystressful fall and winter months (Diehl and Koehn, 1985).…”

Section: Introductionmentioning

confidence: 99%

Genetics of carbohydrate metabolism and growth in Eisenia foetida (Oligochaeta: Lumbricidae)

Diehl

1988

Heredity

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The heterozygosity of 13 polymorphic loci, encoding 10 enzymes from several pathways in carbohydrate metabolism, was tested for its effect on growth in juvenile manure worms Eisenia foetida (n = 169), raised under stressful (limited food, low moisture) followed by non-stressful (abundant food, high moisture) conditions. The predictive value of heterozygosity on growth was greatly improved by treating each locus separately rather than summing heterozygosity across all loci (multilocus heterozygosity). Under non-stressful conditions, heterozygosity among loci treated separately had no effect on growth rate (F = 1.60; df = 13, 155; NS); whereas under stressful conditions, heterozygosity among loci treated separately had significant and differential effects on growth rate (F = 234; df = 13, 155; P <0.01) with 7 loci contributing to a positive heterozygosity-growth rate correlation (r =0235; P <0.005) and 6 loci contributing to a negative heterozygosity-growth rate correlation (r = -0•202, P <0.01). Implicated loci could not be easily grouped into specific metabolic pathways. The negative contribution by some loci may arise as a consequence of heterozygote inferiority, linkage disequilibria with positively-contributing loci, or strong selection at that locus.

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Multiple-locus heterozygosity, mortality, and growth in a cohort of Mytilus edulis

Cited by 83 publications

References 14 publications

Growth rate and heterozygosity in the plaice, Pleuronectes platessa

Growth rate and heterozygosity in the plaice, Pleuronectes platessa

Historical and size-dependent genetic variation in hybrid mussel populations

Genetics of carbohydrate metabolism and growth in Eisenia foetida (Oligochaeta: Lumbricidae)

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