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Wider sampling reveals a non-sister relationship for geographically contiguous lineages of a marine mussel

The accuracy of phylogenetic inference can be significantly improved by the addition of more taxa and by increasing the spatial coverage of sampling. In previous studies, the brown mussel Perna perna showed a sister–lineage relationship between eastern and western individuals contiguously distribute...

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Autores principales: Cunha, Regina L, Nicastro, Katy R, Costa, Joana, McQuaid, Christopher D, Serrão, Ester A, Zardi, Gerardo I
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Blackwell Publishing Ltd 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4201422/
https://www.ncbi.nlm.nih.gov/pubmed/25360249
http://dx.doi.org/10.1002/ece3.1033
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author Cunha, Regina L
Nicastro, Katy R
Costa, Joana
McQuaid, Christopher D
Serrão, Ester A
Zardi, Gerardo I
author_facet Cunha, Regina L
Nicastro, Katy R
Costa, Joana
McQuaid, Christopher D
Serrão, Ester A
Zardi, Gerardo I
author_sort Cunha, Regina L
collection PubMed
description The accuracy of phylogenetic inference can be significantly improved by the addition of more taxa and by increasing the spatial coverage of sampling. In previous studies, the brown mussel Perna perna showed a sister–lineage relationship between eastern and western individuals contiguously distributed along the South African coastline. We used mitochondrial (COI) and nuclear (ITS) sequence data to further analyze phylogeographic patterns within P. perna. Significant expansion of the geographical coverage revealed an unexpected pattern. The western South African lineage shared the most recent common ancestor (MRCA) with specimens from Angola, Venezuela, and Namibia, whereas eastern South African specimens and Mozambique grouped together, indicating a non-sister relationship for the two South African lineages. Two plausible biogeographic scenarios to explain their origin were both supported by the hypotheses-testing analysis. One includes an Indo-Pacific origin for P. perna, dispersal into the Mediterranean and Atlantic through the Tethys seaway, followed by recent secondary contact after southward expansion of the western and eastern South African lineages. The other scenario (Out of South Africa) suggests an ancient vicariant divergence of the two lineages followed by their northward expansion. Nevertheless, the “Out of South Africa” hypothesis would require a more ancient divergence between the two lineages. Instead, our estimates indicated that they diverged very recently (310 kyr), providing a better support for an Indo-Pacific origin of the two South African lineages. The arrival of the MRCA of P. perna in Brazil was estimated at 10 [0–40] kyr. Thus, the hypothesis of a recent introduction in Brazil through hull fouling in wooden vessels involved in the transatlantic itineraries of the slave trade did not receive strong support, but given the range for this estimate, it could not be discarded. Wider geographic sampling of marine organisms shows that lineages with contiguous distributions need not share a common ancestry.
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spelling pubmed-42014222014-10-30 Wider sampling reveals a non-sister relationship for geographically contiguous lineages of a marine mussel Cunha, Regina L Nicastro, Katy R Costa, Joana McQuaid, Christopher D Serrão, Ester A Zardi, Gerardo I Ecol Evol Original Research The accuracy of phylogenetic inference can be significantly improved by the addition of more taxa and by increasing the spatial coverage of sampling. In previous studies, the brown mussel Perna perna showed a sister–lineage relationship between eastern and western individuals contiguously distributed along the South African coastline. We used mitochondrial (COI) and nuclear (ITS) sequence data to further analyze phylogeographic patterns within P. perna. Significant expansion of the geographical coverage revealed an unexpected pattern. The western South African lineage shared the most recent common ancestor (MRCA) with specimens from Angola, Venezuela, and Namibia, whereas eastern South African specimens and Mozambique grouped together, indicating a non-sister relationship for the two South African lineages. Two plausible biogeographic scenarios to explain their origin were both supported by the hypotheses-testing analysis. One includes an Indo-Pacific origin for P. perna, dispersal into the Mediterranean and Atlantic through the Tethys seaway, followed by recent secondary contact after southward expansion of the western and eastern South African lineages. The other scenario (Out of South Africa) suggests an ancient vicariant divergence of the two lineages followed by their northward expansion. Nevertheless, the “Out of South Africa” hypothesis would require a more ancient divergence between the two lineages. Instead, our estimates indicated that they diverged very recently (310 kyr), providing a better support for an Indo-Pacific origin of the two South African lineages. The arrival of the MRCA of P. perna in Brazil was estimated at 10 [0–40] kyr. Thus, the hypothesis of a recent introduction in Brazil through hull fouling in wooden vessels involved in the transatlantic itineraries of the slave trade did not receive strong support, but given the range for this estimate, it could not be discarded. Wider geographic sampling of marine organisms shows that lineages with contiguous distributions need not share a common ancestry. Blackwell Publishing Ltd 2014-06 2014-04-25 /pmc/articles/PMC4201422/ /pubmed/25360249 http://dx.doi.org/10.1002/ece3.1033 Text en © 2014 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd. http://creativecommons.org/licenses/by/3.0/ This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
Cunha, Regina L
Nicastro, Katy R
Costa, Joana
McQuaid, Christopher D
Serrão, Ester A
Zardi, Gerardo I
Wider sampling reveals a non-sister relationship for geographically contiguous lineages of a marine mussel
title Wider sampling reveals a non-sister relationship for geographically contiguous lineages of a marine mussel
title_full Wider sampling reveals a non-sister relationship for geographically contiguous lineages of a marine mussel
title_fullStr Wider sampling reveals a non-sister relationship for geographically contiguous lineages of a marine mussel
title_full_unstemmed Wider sampling reveals a non-sister relationship for geographically contiguous lineages of a marine mussel
title_short Wider sampling reveals a non-sister relationship for geographically contiguous lineages of a marine mussel
title_sort wider sampling reveals a non-sister relationship for geographically contiguous lineages of a marine mussel
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4201422/
https://www.ncbi.nlm.nih.gov/pubmed/25360249
http://dx.doi.org/10.1002/ece3.1033
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