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Mitochondrial DNA phylogeography and mating compatibility reveal marked genetic structuring and speciation in the NE Atlantic bryozoan Celleporella hyalina

Gomez, Africa; Hughes, Roger N.; Wright, Peter J.; Carvalho, Gary R.; Lunt, David H.

Authors

Roger N. Hughes

Peter J. Wright

Gary R. Carvalho



Abstract

The marine bryozoan Celleporella hyalina is a species complex composed of many highly divergent and mostly allopatric genetic lineages that are reproductively isolated but share a remarkably similar morphology. One such lineage commonly encrusts macroalgae throughout the NE Atlantic coast. To explore the processes leading to geographical diversification, reproductive isolation and speciation in this taxon, we (i) investigated NE Atlantic C. hyalina mitochondrial DNA phylogeography, and (ii) used breeding trials between geographical isolates to ascertain reproductive isolation. We find that haplotype diversity is geographically variable and there is a strong population structure, with significant isolation by distance. NE Atlantic C. hyalina is structured into two main parapatric lineages that appear to have had independent Pleistocene histories. Range expansions have resulted in two contact zones in Spain and W Ireland. Lineage 1 is found from Ireland to Spain and has low haplotype diversity, with closely related haplotypes, suggesting a recent population expansion into the Irish Sea, S Ireland, S England and Spain. Lineage 2 is found from Iceland to Spain and has high haplotype diversity. Complete reproductive isolation was found between some geographical isolates representing both lineages, whereas it was incomplete or asymmetric between others, suggesting these latter phylogeographical groups probably represent incipient species. The phylogeographical distribution of NE Atlantic C. hyalina does not fall easily into a pattern of southern refugia, and we discuss likely differences between terrestrial and marine system responses to Pleistocene glacial cycles.

Journal Article Type Article
Publication Date 2007-05
Journal MOLECULAR ECOLOGY
Print ISSN 0962-1083
Electronic ISSN 1365-294X
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 16
Issue 10
Pages 2173-2188
APA6 Citation Gomez, A., Hughes, R. N., Wright, P. J., Carvalho, G. R., & Lunt, D. H. (2007). Mitochondrial DNA phylogeography and mating compatibility reveal marked genetic structuring and speciation in the NE Atlantic bryozoan Celleporella hyalina. Molecular ecology, 16(10), (2173-2188). doi:10.1111/j.1365-294X.2007.03308.x. ISSN 0962-1083
DOI https://doi.org/10.1111/j.1365-294X.2007.03308.x
Keywords Bryozoa; COI; marine phylogeography; Mating trials; Paternity testing; Reproductive isolation
Publisher URL https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-294X.2007.03308.x
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