Aspects of the population genetics of herring,Clupea harengus,around the British Isles and in the Baltic Sea |
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| Institution: | 1. Nofima, P.O. Box 5010, N-1430 Ås, Norway;2. Department of Animal and Aquaculture Sciences, University of Life Sciences, P.O. Box 5003, N-1430 Ås, Norway;3. Nofima, Muninbakken 9-13, N-9291 Tromsø, Norway;4. Institute of Chemistry of Molecular Recognition—CNR and Institute of Biochemistry and Clinical Biochemistry, Catholic University of Rome, 00168 Rome, Italy;5. Department of Arctic and Marine Biology, UiT The Arctic University of Norway, N-9037 Tromsø, Norway;6. Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences, Box 7023, S-75007 Uppsala, Sweden;7. Institute of Biochemistry and Clinical Biochemistry, Catholic University of Rome, 00168 Rome, Italy;8. Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, P.O. Box 1066 Blindern, N-0316 Oslo, Norway |
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| Abstract: | Electrophoretic variation within and among Clupea harengus L. samples taken from 10 locations in the northwest region of the British Isles and from a spawning site in the Baltic Sea and Thames Estuary were studied. Sixteen enzyme systems, coded by a putative 30 loci, were examined. Twelve loci were found to be polymorphic and were considered usable for population surveys. The proportion of polymorphic loci varied between 0.115 and 0.230 (0.95 criterion) and between 0.308 and 0.461 (0.99 criterion); average heterozygosity was 0.045 ± 0.02. Differentiation among samples was found to be low, even between samples from the west of Ireland and the Baltic Sea. The average Nei's genetic distance was 0.0004 and FST value was 0.002. The magnitude of genetic differentiation between stocks, as indicated from genetic distance values, is within a much narrower range than found between geographically isolated populations of other fish species. Temporal stability over three different development stages and eight overlapping year classes of North Irish Sea herring was demonstrated. |
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