New SNP markers reveal largely concordant clinal variation across the hybrid zone between Mytilus spp. in the Baltic Sea
| Autor: | Małgorzata Zbawicka, Roman Wenne, Jakob Strand, Tomasz J. Sanko |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
QH301-705.5
Population Zoology Introgression Aquatic Science Biology Oceanography Population structure Microbiology Gene flow Single locus clines Hybrid zone Biology (General) education Allele frequency Ecology Evolution Behavior and Systematics Hybrid education.field_of_study Hybrid index score Ecology fungi Diagnostic markers Reproductive isolation biology.organism_classification Mytilus QR1-502 |
| Zdroj: | Zbawicka, M, Saneko, T, Strand, J & Wenne, R 2014, ' New SNP markers reveal largely concordant clinal variation across the hybrid zone between Mytilus spp. in the Baltic Sea ', Aquatic Biology, vol. 21, pp. 25-36 . https://doi.org/10.3354/ab00566 Aquatic Biology, Vol 21, Iss 1, Pp 25-36 (2014) |
| DOI: | 10.3354/ab00566 |
| Popis: | Environmental conditions such as a pronounced salinity gradient and postglacial his- tory make the Baltic Sea a suitable area for studying how selection and gene flow affect genetic differentiation in marine species. A cDNA library was used to identify new single nucleotide poly- morphisms (SNPs) in Baltic populations of Mytilus spp. mussels. Sixty polymorphic SNPs were used to genotype 642 individual mussels from the inner Baltic, Danish Straits, northwest Denmark and a population of the northeast Pacific. We characterized 49 novel SNP markers that differenti- ate the populations of the North and Baltic Sea areas. Concordant narrow clines were observed at the entrance of the Baltic Sea for most of these markers. Considerable variance of hybrid index scores was observed in populations with intermediate allele frequencies within the hybrid zone, e.g. in Gedser and Hjelm. The presented results are in accordance with the existence of strong reproductive isolation, probably caused by a combination of exogenous (e.g. adaptation to brack- ish waters) and endogenous pre- and post-zygotic factors (e.g. selection against hybrids). The overwhelming majority of new SNPs markers showed a larger representation of M. trossulus than M. edulis genes in the nuclear DNA of Baltic Mytilus species. Finally, we identified a few markers with an elevated level of introgression of M. edulis alleles in the Baltic Sea M. trossulus popula- tions in comparison to the reference M. trossulus population of the Pacific. |
| Databáze: | OpenAIRE |
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