Widespread introgression in deep-sea hydrothermal vent mussels.

Breusing, Corinna, Vrijenhoek, Robert C. and Reusch, Thorsten B.H. (2017) Widespread introgression in deep-sea hydrothermal vent mussels. Open Access BMC Evolutionary Biology, 17 (1). DOI 10.1186/s12862-016-0862-2.

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Abstract

Background:
The analysis of hybrid zones is crucial for gaining a mechanistic understanding of the process of speciation and the maintenance of species boundaries. Hybrid zones have been studied intensively in terrestrial and shallow-water ecosystems, but very little is known about their occurrence in deep-sea environments. Here we used diagnostic, single nucleotide polymorphisms in combination with one mitochondrial gene to re-examine prior hypotheses about a contact zone involving deep-sea hydrothermal vent mussels, Bathymodiolus azoricus and B. puteoserpentis, living along the Mid-Atlantic Ridge.

Results:
Admixture was found to be asymmetric with respect to the parental species, while introgression was more widespread geographically than previously recognized. Admixed individuals with a majority of alleles from one of the parental species were most frequent in habitats corresponding to that species. Mussels found at a geographically intermediate vent field constituted a genetically mixed population that showed no evidence for hybrid incompatibilities, a finding that does not support a previously inferred tension zone model.

Conclusions:
Our analyses indicate that B. azoricus and B. puteoserpentis hybridize introgressively across a large geographic area without evidence for general hybrid incompatibilities. While these findings shed new light onto the genetic structure of this hybrid zone, many aspects about its nature still remain obscure. Our study sets a baseline for further research that should primarily focus on the acquisition of additional mussel samples and environmental data, a detailed exploration of vent areas and hidden populations as well as genomic analyses in both mussel hosts and their bacterial symbionts.

Document Type: Article
Additional Information: Availability of data and materials Sanger sequences for the ND4 locus are available in GenBank (accession numbers KU950834–KU951111). SNP genotype data and the input files for statistical analyses can be found in Pangaea under https://doi.pangaea.de/ 10.1594/PANGAEA.859094 [58]. Individual genotype and haplotype data are also provided in Table S3 of the supplementary material.
Keywords: Bathymodiolus; Introgressive hybridization; Hybrid zone models; Single nucleotide polymorphisms
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
Kiel University
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1186/s12862-016-0862-2
ISSN: 1471-2148
Expeditions/Models/Experiments:
Date Deposited: 16 Jan 2017 09:07
Last Modified: 01 Feb 2019 15:14
URI: http://oceanrep.geomar.de/id/eprint/35668

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