Oct 30, 2015

Past and contemporary introgression between two strongly differentiated Ciona species as revealed by a post-genomic SNPs panel

BioRxiv : the Preprint Server for Biology
Sarah BouchemousseFrédérique Viard


One important outcome of biological introductions is to bring into contact species that diverged in allopatry. For interfertile taxa, the evolutionary outcomes of such secondary contacts may be diverse (e.g. adaptive introgression from or into the introduced species) but are not yet well examined in the wild. In this context, the recent secondary contact between the non-native species Ciona robusta and the native species C.intestinalis, in the English Channel, provides an excellent case study to examine. By means of a population genomic approach, using 310 SNPs developed from full transcriptomes, the genetic diversity at population and species level was examined by studying 449 individuals (NC.robusta = 213, NC. intestinalis = 236) sampled in 12 sites from the English Channel, North Sea, NW Atlantic and SE Pacific where they are found either alone or living in the same locality and habitat (syntopy). As expected from previous analyses, C. robusta showed less polymorphism than C. intestinalis, a pattern that may partly be explained by its non-native status in most of the study localities. The results clearly showed an almost complete absence of contemporary gene flow between the two species in syntopic localities, with only one ...Continue Reading

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Mentioned in this Paper

Ciona intestinalis
Gene Polymorphism
Crypthelia robusta
Curvularia robusta
Corythoichthys intestinalis
Callulops robustus
Nucleic Acid Hybridization Procedure
Genomic Stability

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