Genetic evidence for naturally occurring hybrids between Mytilus edulis and Mytilus galloprovincialis
Skibrinski, D.O.F.; Ahmad, M.; Beardmore, J.A. (1978). Genetic evidence for naturally occurring hybrids between Mytilus edulis and Mytilus galloprovincialis. Evolution 32(2): 354-364. https://dx.doi.org/10.2307/2407603
In: Evolution. Society for the Study of Evolution: Lancaster. ISSN 0014-3820; e-ISSN 1558-5646, more
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| Keywords |
Enzymes
Hybrids
Polymorphism
Mytilus Linnaeus, 1758 [WoRMS]; Mytilus edulis Linnaeus, 1758 [WoRMS]; Mytilus galloprovincialis Lamarck, 1819 [WoRMS]
Marine/Coastal |
| Authors | | Top |
- Skibrinski, D.O.F.
- Ahmad, M.
- Beardmore, J.A.
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| Abstract |
The 2 mussels M. edulis and M. galloprovincialis live sympatrically in southwest England. Data are presented for populations at Croyde in North Devon and Rock in North Cornwall which show that the 2 types differ greatly in allele frequencies at 3 polymorphic loci (esterase-D, leucine aminopeptidase-1, and phosphohexose isomerase), and that samples from the populations show large deficits of heterozygotes and strong associations of genotypes among the loci. These results are interpreted as evidence that the 2 types are at least partially isolated. Samples of morphologically intermediate individuals are shown to contain a large excess of genotypes heterozygous for different alleles each of which is frequent in one, but infrequent in the other, of the 2 types. This provides good evidence that hybridization occurs in nature. The proportion of F1 hybrids is estimated to be 5 4% and 2 1% at Croyde and Rock respectively. The results are discussed in relation to evolutionary theory concerning hybridization and speciation, genetic variation in Mytilus and the taxonomic status of M. edulis and M. galloprovincialis . |
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