A molecular approach to the ecology of a mussel (Mytilus edulis M-trossulus) hybrid zone on the east coast of Newfoundland, Canada

被引:74
作者
Comesaña, AS
Toro, JE [1 ]
Innes, DJ
Thompson, RJ
机构
[1] Mem Univ Newfoundland, Dept Biol, St John, NF A1B 3X9, Canada
[2] Univ Vigo, Fac Ciencias Biol, E-36200 Vigo, Spain
[3] Mem Univ Newfoundland, Ctr Ocean Sci, St John, NF A1C 5S7, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1007/s002270050460
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Mytilus trossulus Gould and M. edulis L. co-exist in mixed populations in Atlantic Canadian waters. Although there is evidence that the two species hybridize in natural populations and that hybrids produce progeny through backcrosses, no study of the microgeographic distribution of the two forms and their hybrids has been made. Here we examine subtidal samples of mussels taken in July 1997 from two locations in eastern Newfoundland (Canada) and from wave-exposed and protected environments within each location. Shell lengths ranged from 15 to about 90 mm. Mussels were classified as pure forms or hybrids (F-1, F-2 and from backcrosses) based on four diagnostic markers, two allozyme loci (Mpi and Est-D) and two nuclear PCR-based DNA markers (ITS and Glu-5). In addition, a PCR-based mtDNA marker (COIII) was used to characterize the distribution of mtDNA mitotypes among pure and hybrid individuals. There were differences in the proportions of pure nd. edulis and nl. trossulus between sites and between environments at one location. M. trossulus was the predominant species at one of the two exposed sites. In all four samples, nd. trossulus was also the predominant form among small individuals. The frequency of hybrids was 26% overall and did not differ among samples. Hybrids consisted mostly of backcrosses that were M. trossulus-biased among small mussels and M. edulis-biased among large ones. We conclude that both intrinsic genetic factors and extrinsic environmental factors influence the relative frequency of M. edulis, M. trossulus and their hybrids.
引用
收藏
页码:213 / 221
页数:9
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