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Genetic and phenoptypic differentiation of zebra mussel populations colonizing Spanish river basins

AuthorsNavarro Cuenca, Anna; Sánchez-Fontenla, J.; Cordero, David CSIC; Faria, Melissa CSIC ORCID CVN; Peña, Juan B. CSIC; Saavedra, Carlos Felipe CSIC ORCID; Blázquez, Mercedes CSIC ORCID ; Barata Martí, Carlos CSIC ORCID ; Piña, Benjamín CSIC ORCID
KeywordsMitochondrial DNA
Transcriptomic responses
Genetic differentiation
Issue DateJul-2013
CitationEcotoxicology 22(5): 915-928 (2013)
AbstractZebra mussel populations in Ebro and Mijares Rivers (northern Spain) were analyzed to study the mechanisms by which this aquatic species deals with pollution. Variability analyses of mitochondrial cytochrome oxidase I gene and of one nuclear microsatellite were performed for ten populations from the Ebro River and one from the Mijares River. Comparison of these results with those from five additional European populations indicated that the Spanish populations constitute a homogeneous gene pool. Transcriptome analyses of gill samples from a subset of the Spanish populations showed changes on expression levels that correlated with variations in general fitness and loads of heavy metals. The less polluted upstream Ebro populations showed overexpression of mitochondrial and cell proliferation-related genes compared to the more polluted, downstream Ebro populations. Our data indicate that heavy metals were the main factors explaining these transcriptomic patterns, and that zebra mussel is resilient to pollutants (like mercury and organochlorine compounds) proved to be extremely toxic to vertebrates. We propose that zebra mussel populations sharing a common gene pool may acclimate to different levels and forms of pollution through modulations in their transcriptomic profile, although direct selection on genes showing differential expression patterns cannot be ruled out. © 2013 Springer Science+Business Media New York
DescriptionNavarro, Anna ... et al.-- 14 pages, 6 figures, 3 tables
Publisher version (URL)https://doi.org/10.1007/s10646-013-1084-7
Identifiersdoi: 10.1007/s10646-013-1084-7
issn: 0963-9292
e-issn: 1573-3017
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