Phylogeographic structure of a protogynous hermaphrodite species, the ballan wrasse Labrus bergylta, in Ireland, Scotland, and Norway, using mitochondrial DNA sequence data

Abstract D'Arcy, J., Mirimin, L., and FitzGerald, R. Phylogeographic structure of a protogynous hermaphrodite species, the ballan wrasse Labrus bergylta, in Ireland, Scotland, and Norway, using mitochondrial DNA sequence data. – ICES Journal of Marine Science, 70: 685–693. The ballan wrasse, Labrus bergylta, is a protogynous hermaphrodite marine fish species that inhabits coastal waters of the eastern North Atlantic. Sequential hermaphrodite species tend to be characterized by a skewed sex ratio, which is thought to lead to marked population structuring due to a reduced effective number of breeders. Furthermore, due to its large body size (compared with other wrasse species) and its peculiar feeding behaviour, this species has been identified as a candidate cleaner fish to be used in parasite control of farmed finfish. In the present study, we used mitochondrial DNA (control region) sequence data to investigate the genetic diversity and population structuring of ballan wrasse in waters around the British Isles and southern Norway. Ballan wrasse in southern Norway showed lower levels of genetic diversity than around the British Isles, which appear to be the result of historical demographic events (population bottleneck followed by expansion). Analysis of mismatch distributions and the presence of two highly divergent clades unevenly represented in Atlantic and Scandinavian regions suggest distinct recolonization patterns in these two regions. These results provide a first insight on the status of wild populations of ballan wrasse in the eastern North Atlantic, with implications for conservation and management.

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Phylogeographic analysis reveals a deep lineage split within North Atlantic Littorina saxatilis

Proceedings of The Royal Society B Biological Sciences ◽

10.1098/rspb.2011.0346 ◽

2011 ◽

Vol 278 (1722) ◽

pp. 3175-3183 ◽

Cited By ~ 27

Author(s):

Meredith M. Doellman ◽

Geoffrey C. Trussell ◽

John W. Grahame ◽

Steve V. Vollmer

Keyword(s):

North Atlantic ◽

Sequence Data ◽

Model Organisms ◽

Phylogeographic Structure ◽

Littorina Saxatilis ◽

Mtdna Sequence ◽

Littorina Arcana ◽

Mtdna Lineages ◽

Eastern North Atlantic ◽

The Last Glacial

Phylogeographic studies provide critical insight into the evolutionary histories of model organisms; yet, to date, range-wide data are lacking for the rough periwinkle Littorina saxatilis , a classic example of marine sympatric speciation. Here, we use mitochondrial DNA (mtDNA) sequence data to demonstrate that L. saxatilis is not monophyletic for this marker, but is composed of two distinct mtDNA lineages (I and II) that are shared with sister species Littorina arcana and Littorina compressa . Bayesian coalescent dating and phylogeographic patterns indicate that both L. saxatilis lineages originated in the eastern North Atlantic, around the British Isles, at approximately 0.64 Ma. Both lineages are now distributed broadly across the eastern, central and western North Atlantic, and show strong phylogeographic structure among regions. The Iberian Peninsula is genetically distinct, suggesting prolonged isolation from northeastern North Atlantic populations. Western North Atlantic populations of L. saxatilis lineages I and II predate the last glacial maximum and have been isolated from eastern North Atlantic populations since that time. This identification of two distinct, broadly distributed mtDNA lineages further complicates observed patterns of repeated incipient ecological speciation in L. saxatilis , because the sympatric origins of distinct ecotype pairs on eastern North Atlantic shores may be confounded by admixture of divergent lineages.

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A new Liopeltis Fitzinger, 1843 (Squamata: Colubridae) from Pulau Tioman, Peninsular Malaysia

Zootaxa ◽

10.11646/zootaxa.4766.3.6 ◽

2020 ◽

Vol 4766 (3) ◽

pp. 472-484

Author(s):

HANNAH E. SOM ◽

L. LEE GRISMER ◽

PERRY L. JR. WOOD ◽

EVAN S. H. QUAH ◽

RAFE M. BROWN ◽

...

Keyword(s):

Mitochondrial Dna ◽

New Species ◽

Dna Sequence ◽

Rare Species ◽

Sequence Data ◽

Peninsular Malaysia ◽

Tropical Asia ◽

Dna Sequence Data ◽

A New Species ◽

Lines Of Evidence

Liopeltis is a genus of poorly known, infrequently sampled species of colubrid snakes in tropical Asia. We collected a specimen of Liopeltis from Pulau Tioman, Peninsular Malaysia, that superficially resembled L. philippina, a rare species that is endemic to the Palawan Pleistocene Aggregate Island Complex, western Philippines. We analyzed morphological and mitochondrial DNA sequence data from the Pulau Tioman specimen and found distinct differences to L. philippina and all other congeners. On the basis of these corroborated lines of evidence, the Pulau Tioman specimen is described as a new species, L. tiomanica sp. nov. The new species occurs in sympatry with L. tricolor on Pulau Tioman, and our description of L. tiomanica sp. nov. brings the number of endemic amphibians and reptiles on Pulau Tioman to 12.

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