Regional differentiation and extensive hybridization between mitochondrial clades of the Southern Ocean giant sea spider Colossendeis megalonyx.
Assessing the enormous diversity of Southern Ocean benthic species and their evolutionary histories is a central task in the era of global climate change. Based on mitochondrial markers, it was recently suggested that the circumpolar giant sea spider Colossendeis megalonyx comprises a complex of at...
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ftcdlib:oai:escholarship.org:ark:/13030/qt6pz1x7ns 2023-05-15T13:42:04+02:00 Regional differentiation and extensive hybridization between mitochondrial clades of the Southern Ocean giant sea spider Colossendeis megalonyx. Dietz, Lars Arango, Claudia P Dömel, Jana S Halanych, Kenneth M Harder, Avril M Held, Christoph Mahon, Andrew R Mayer, Christoph Melzer, Roland R Rouse, Greg W Weis, Andrea Wilson, Nerida G Leese, Florian 140424 2015-07-01 application/pdf https://escholarship.org/uc/item/6pz1x7ns unknown eScholarship, University of California qt6pz1x7ns https://escholarship.org/uc/item/6pz1x7ns public Royal Society open science, vol 2, iss 7 Antarctic Pycnogonida benthos glacial refugia phylogeography speciation article 2015 ftcdlib 2022-08-01T17:29:50Z Assessing the enormous diversity of Southern Ocean benthic species and their evolutionary histories is a central task in the era of global climate change. Based on mitochondrial markers, it was recently suggested that the circumpolar giant sea spider Colossendeis megalonyx comprises a complex of at least six cryptic species with mostly small and non-overlapping distribution ranges. Here, we expand the sampling to include over 500 mitochondrial COI sequences of specimens from around the Antarctic. Using multiple species delimitation approaches, the number of distinct mitochondrial OTUs increased from six to 15-20 with our larger dataset. In contrast to earlier studies, many of these clades show almost circumpolar distributions. Additionally, analysis of the nuclear internal transcribed spacer region for a subset of these specimens showed incongruence between nuclear and mitochondrial results. These mito-nuclear discordances suggest that several of the divergent mitochondrial lineages can hybridize and should not be interpreted as cryptic species. Our results suggest survival of C. megalonyx during Pleistocene glaciations in multiple refugia, some of them probably located on the Antarctic shelf, and emphasize the importance of multi-gene datasets to detect the presence of cryptic species, rather than their inference based on mitochondrial data alone. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean University of California: eScholarship Antarctic Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Antarctic Pycnogonida benthos glacial refugia phylogeography speciation |
spellingShingle |
Antarctic Pycnogonida benthos glacial refugia phylogeography speciation Dietz, Lars Arango, Claudia P Dömel, Jana S Halanych, Kenneth M Harder, Avril M Held, Christoph Mahon, Andrew R Mayer, Christoph Melzer, Roland R Rouse, Greg W Weis, Andrea Wilson, Nerida G Leese, Florian Regional differentiation and extensive hybridization between mitochondrial clades of the Southern Ocean giant sea spider Colossendeis megalonyx. |
topic_facet |
Antarctic Pycnogonida benthos glacial refugia phylogeography speciation |
description |
Assessing the enormous diversity of Southern Ocean benthic species and their evolutionary histories is a central task in the era of global climate change. Based on mitochondrial markers, it was recently suggested that the circumpolar giant sea spider Colossendeis megalonyx comprises a complex of at least six cryptic species with mostly small and non-overlapping distribution ranges. Here, we expand the sampling to include over 500 mitochondrial COI sequences of specimens from around the Antarctic. Using multiple species delimitation approaches, the number of distinct mitochondrial OTUs increased from six to 15-20 with our larger dataset. In contrast to earlier studies, many of these clades show almost circumpolar distributions. Additionally, analysis of the nuclear internal transcribed spacer region for a subset of these specimens showed incongruence between nuclear and mitochondrial results. These mito-nuclear discordances suggest that several of the divergent mitochondrial lineages can hybridize and should not be interpreted as cryptic species. Our results suggest survival of C. megalonyx during Pleistocene glaciations in multiple refugia, some of them probably located on the Antarctic shelf, and emphasize the importance of multi-gene datasets to detect the presence of cryptic species, rather than their inference based on mitochondrial data alone. |
format |
Article in Journal/Newspaper |
author |
Dietz, Lars Arango, Claudia P Dömel, Jana S Halanych, Kenneth M Harder, Avril M Held, Christoph Mahon, Andrew R Mayer, Christoph Melzer, Roland R Rouse, Greg W Weis, Andrea Wilson, Nerida G Leese, Florian |
author_facet |
Dietz, Lars Arango, Claudia P Dömel, Jana S Halanych, Kenneth M Harder, Avril M Held, Christoph Mahon, Andrew R Mayer, Christoph Melzer, Roland R Rouse, Greg W Weis, Andrea Wilson, Nerida G Leese, Florian |
author_sort |
Dietz, Lars |
title |
Regional differentiation and extensive hybridization between mitochondrial clades of the Southern Ocean giant sea spider Colossendeis megalonyx. |
title_short |
Regional differentiation and extensive hybridization between mitochondrial clades of the Southern Ocean giant sea spider Colossendeis megalonyx. |
title_full |
Regional differentiation and extensive hybridization between mitochondrial clades of the Southern Ocean giant sea spider Colossendeis megalonyx. |
title_fullStr |
Regional differentiation and extensive hybridization between mitochondrial clades of the Southern Ocean giant sea spider Colossendeis megalonyx. |
title_full_unstemmed |
Regional differentiation and extensive hybridization between mitochondrial clades of the Southern Ocean giant sea spider Colossendeis megalonyx. |
title_sort |
regional differentiation and extensive hybridization between mitochondrial clades of the southern ocean giant sea spider colossendeis megalonyx. |
publisher |
eScholarship, University of California |
publishDate |
2015 |
url |
https://escholarship.org/uc/item/6pz1x7ns |
op_coverage |
140424 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
Royal Society open science, vol 2, iss 7 |
op_relation |
qt6pz1x7ns https://escholarship.org/uc/item/6pz1x7ns |
op_rights |
public |
_version_ |
1766162321047027712 |