Evolutionary pathways among shallow and deep-sea echinoids of the genus Sterechinus in the Southern Ocean
Artículo de publicación ISI Antarctica is structured by a narrow and deep continental shelf that sustains a remarkable number of benthic species. The origin of these species and their affinities with the deep-sea fauna that borders the continent shelf are not clear. To date, two main hypotheses have...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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ftunivchilecap:oai:www.captura.uchile.cl:2250/14844 2023-05-15T13:43:13+02:00 Evolutionary pathways among shallow and deep-sea echinoids of the genus Sterechinus in the Southern Ocean Díaz, A. Féral, J.-P. David, B. Saucède, T. Poulin, E. 2011-01 https://doi.org/10.1016/j.dsr2.2010.10.012 http://www.captura.uchile.cl/handle/2250/14844 en eng PERGAMON-ELSEVIER Sea urchins Coastal zone Deep water Phylogeny Biogeography Evolutionary patterns COI Artículo de Revista 2011 ftunivchilecap https://doi.org/10.1016/j.dsr2.2010.10.012 2013-12-20T10:27:56Z Artículo de publicación ISI Antarctica is structured by a narrow and deep continental shelf that sustains a remarkable number of benthic species. The origin of these species and their affinities with the deep-sea fauna that borders the continent shelf are not clear. To date, two main hypotheses have been considered to account for the evolutionary connection between the faunas: (1) either shallow taxa moved down to deep waters (submergence) or (2) deep-sea taxa colonized the continental shelf (emergence). The regular sea urchin genus Sterechinus is a good model to explore the evolutionary relationships among these faunas because its five nominal species include Antarctic and Subantarctic distributions and different bathymetric ranges. Phylogenetic relationships and divergence times among Sterechinus species were established using the COI mitochondrial gene by assuming a molecular clock hypothesis. The results showed the existence of two genetically distinct main groups. The first corresponds exclusively to the shallow-water Antarctic species S. neumayeri, while the second includes all the other nominal species, either deep or shallow. Antarctic or Subantarctic. Within the latter group, S. dentifer specimens all formed a monophyletic cluster, slightly divergent from all other specimens, which were mixed in a second cluster that included S. agassizi from the continental shelf of Argentina, S. diadema from the Kerguelen Plateau and S. antarcticus from the deep Antarctic shelf. These results suggest that the deeper-water species S. dentifer and S. antarcticus are more closely related to Subantarctic species than to the shallow Antarctic species S. neumayeri. Thus, for this genus, neither the submergence nor emergence scenario explains the relationships between Antarctic and deep-sea benthos. At least in the Weddell quadrant, the observed genetic pattern suggests an initial separation between Antarctic and Subantarctic shallow species, and a much later colonization of deep water from the Subantarctic region, probably promoted by the geomorphology of the Scotia Arc. Article in Journal/Newspaper Antarc* Antarctic Antarctica antarcticus Southern Ocean Universidad de Chile: Captura Antarctic Argentina Isi ENVELOPE(-38.550,-38.550,65.617,65.617) Kerguelen Southern Ocean Weddell Deep Sea Research Part II: Topical Studies in Oceanography 58 1-2 205 211 |
institution |
Open Polar |
collection |
Universidad de Chile: Captura |
op_collection_id |
ftunivchilecap |
language |
English |
topic |
Sea urchins Coastal zone Deep water Phylogeny Biogeography Evolutionary patterns COI |
spellingShingle |
Sea urchins Coastal zone Deep water Phylogeny Biogeography Evolutionary patterns COI Díaz, A. Féral, J.-P. David, B. Saucède, T. Poulin, E. Evolutionary pathways among shallow and deep-sea echinoids of the genus Sterechinus in the Southern Ocean |
topic_facet |
Sea urchins Coastal zone Deep water Phylogeny Biogeography Evolutionary patterns COI |
description |
Artículo de publicación ISI Antarctica is structured by a narrow and deep continental shelf that sustains a remarkable number of benthic species. The origin of these species and their affinities with the deep-sea fauna that borders the continent shelf are not clear. To date, two main hypotheses have been considered to account for the evolutionary connection between the faunas: (1) either shallow taxa moved down to deep waters (submergence) or (2) deep-sea taxa colonized the continental shelf (emergence). The regular sea urchin genus Sterechinus is a good model to explore the evolutionary relationships among these faunas because its five nominal species include Antarctic and Subantarctic distributions and different bathymetric ranges. Phylogenetic relationships and divergence times among Sterechinus species were established using the COI mitochondrial gene by assuming a molecular clock hypothesis. The results showed the existence of two genetically distinct main groups. The first corresponds exclusively to the shallow-water Antarctic species S. neumayeri, while the second includes all the other nominal species, either deep or shallow. Antarctic or Subantarctic. Within the latter group, S. dentifer specimens all formed a monophyletic cluster, slightly divergent from all other specimens, which were mixed in a second cluster that included S. agassizi from the continental shelf of Argentina, S. diadema from the Kerguelen Plateau and S. antarcticus from the deep Antarctic shelf. These results suggest that the deeper-water species S. dentifer and S. antarcticus are more closely related to Subantarctic species than to the shallow Antarctic species S. neumayeri. Thus, for this genus, neither the submergence nor emergence scenario explains the relationships between Antarctic and deep-sea benthos. At least in the Weddell quadrant, the observed genetic pattern suggests an initial separation between Antarctic and Subantarctic shallow species, and a much later colonization of deep water from the Subantarctic region, probably promoted by the geomorphology of the Scotia Arc. |
format |
Article in Journal/Newspaper |
author |
Díaz, A. Féral, J.-P. David, B. Saucède, T. Poulin, E. |
author_facet |
Díaz, A. Féral, J.-P. David, B. Saucède, T. Poulin, E. |
author_sort |
Díaz, A. |
title |
Evolutionary pathways among shallow and deep-sea echinoids of the genus Sterechinus in the Southern Ocean |
title_short |
Evolutionary pathways among shallow and deep-sea echinoids of the genus Sterechinus in the Southern Ocean |
title_full |
Evolutionary pathways among shallow and deep-sea echinoids of the genus Sterechinus in the Southern Ocean |
title_fullStr |
Evolutionary pathways among shallow and deep-sea echinoids of the genus Sterechinus in the Southern Ocean |
title_full_unstemmed |
Evolutionary pathways among shallow and deep-sea echinoids of the genus Sterechinus in the Southern Ocean |
title_sort |
evolutionary pathways among shallow and deep-sea echinoids of the genus sterechinus in the southern ocean |
publisher |
PERGAMON-ELSEVIER |
publishDate |
2011 |
url |
https://doi.org/10.1016/j.dsr2.2010.10.012 http://www.captura.uchile.cl/handle/2250/14844 |
long_lat |
ENVELOPE(-38.550,-38.550,65.617,65.617) |
geographic |
Antarctic Argentina Isi Kerguelen Southern Ocean Weddell |
geographic_facet |
Antarctic Argentina Isi Kerguelen Southern Ocean Weddell |
genre |
Antarc* Antarctic Antarctica antarcticus Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica antarcticus Southern Ocean |
op_doi |
https://doi.org/10.1016/j.dsr2.2010.10.012 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
58 |
container_issue |
1-2 |
container_start_page |
205 |
op_container_end_page |
211 |
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1766185988823973888 |