Origin, dispersals and diversification dynamics of Epimeriidae and Iphimediidae (Amphipoda Crustacea) from the Antarctic shelf
The physical isolation of the Antarctic shelf and extreme life conditions contribute to its high degree of endemism. The Antarctic shelf fauna would, however, be composed of Gondwanan descendants, but also of more recent colonizers. The peculiar climatic history of this region might have provided en...
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ftunistlouisbrus:oai:dial.uclouvain.be:boreal:191972 2024-05-12T07:56:35+00:00 Origin, dispersals and diversification dynamics of Epimeriidae and Iphimediidae (Amphipoda Crustacea) from the Antarctic shelf Verheye, Marie Thierry Backeljau Cédric d'Udekem d'Acoz 17th International Colloquium on Amphipoda UCL - SST/ELI/ELIB - Biodiversity 2017 http://hdl.handle.net/2078.1/191972 eng eng Edizioni Danaus boreal:191972 http://hdl.handle.net/2078.1/191972 urn:ISSN:2039-0394 urn:EISSN:2039-0408 Biodiversity Journal, Vol. 8, p. 621-622 info:eu-repo/semantics/conferenceObject 2017 ftunistlouisbrus 2024-04-18T17:33:31Z The physical isolation of the Antarctic shelf and extreme life conditions contribute to its high degree of endemism. The Antarctic shelf fauna would, however, be composed of Gondwanan descendants, but also of more recent colonizers. The peculiar climatic history of this region might have provided environmental prerequisites to the radiation of some lineages, some of which might afterwards colonize the other ocean’s shelves. Amphipods from the families Epimeriidae and Iphimediidae are cosmopolitan, but well-represented on the Antarctic shelf. Antarctic epimeriids (represented herein by the genus Epimeria) are composed of strictly endemic and presumably more generalist species, while many Antarctic iphimediids appear to be food specialists, with some of them distributed on both sides of the Polar Front. By reconstructing time-calibrated phylogenies based on mitochondrial (COI) and nuclear (28S and H3) markers and including representatives from other oceans, this study aims to investigate, for each of these two families, the origin of the Antarctic component, their propensity towards dispersion in/out of the shelf and the in situ diversification patterns. A comparison of observed biogeographic patterns for the two families will give insights into the influence of historical environmental factors on the evolutionary history of organisms with contrasting life history traits. In both phylogenetic reconstructions, all Antarctic and sub-Antarctic (for iphimediids) species formed a clade, sister to a non-Antarctic clade. While the precise timing of origin for the (sub-)Antarctic components could not be inferred in both cases, the (sub-)Antarctic lineages likely arose from late Gondwanan ancestors and hence, did not colonize the Antarctic region after the continent broke apart from the other fragments of Gondwanaland. Moreover, the initial diversification of these two clades occurred during the progressive transition to an Icehouse climate and would therefore be related to cold-waters. A diversification burst within one ... Conference Object Antarc* Antarctic DIAL@USL-B (Université Saint-Louis, Bruxelles) Antarctic The Antarctic |
institution |
Open Polar |
collection |
DIAL@USL-B (Université Saint-Louis, Bruxelles) |
op_collection_id |
ftunistlouisbrus |
language |
English |
description |
The physical isolation of the Antarctic shelf and extreme life conditions contribute to its high degree of endemism. The Antarctic shelf fauna would, however, be composed of Gondwanan descendants, but also of more recent colonizers. The peculiar climatic history of this region might have provided environmental prerequisites to the radiation of some lineages, some of which might afterwards colonize the other ocean’s shelves. Amphipods from the families Epimeriidae and Iphimediidae are cosmopolitan, but well-represented on the Antarctic shelf. Antarctic epimeriids (represented herein by the genus Epimeria) are composed of strictly endemic and presumably more generalist species, while many Antarctic iphimediids appear to be food specialists, with some of them distributed on both sides of the Polar Front. By reconstructing time-calibrated phylogenies based on mitochondrial (COI) and nuclear (28S and H3) markers and including representatives from other oceans, this study aims to investigate, for each of these two families, the origin of the Antarctic component, their propensity towards dispersion in/out of the shelf and the in situ diversification patterns. A comparison of observed biogeographic patterns for the two families will give insights into the influence of historical environmental factors on the evolutionary history of organisms with contrasting life history traits. In both phylogenetic reconstructions, all Antarctic and sub-Antarctic (for iphimediids) species formed a clade, sister to a non-Antarctic clade. While the precise timing of origin for the (sub-)Antarctic components could not be inferred in both cases, the (sub-)Antarctic lineages likely arose from late Gondwanan ancestors and hence, did not colonize the Antarctic region after the continent broke apart from the other fragments of Gondwanaland. Moreover, the initial diversification of these two clades occurred during the progressive transition to an Icehouse climate and would therefore be related to cold-waters. A diversification burst within one ... |
author2 |
UCL - SST/ELI/ELIB - Biodiversity |
format |
Conference Object |
author |
Verheye, Marie Thierry Backeljau Cédric d'Udekem d'Acoz 17th International Colloquium on Amphipoda |
spellingShingle |
Verheye, Marie Thierry Backeljau Cédric d'Udekem d'Acoz 17th International Colloquium on Amphipoda Origin, dispersals and diversification dynamics of Epimeriidae and Iphimediidae (Amphipoda Crustacea) from the Antarctic shelf |
author_facet |
Verheye, Marie Thierry Backeljau Cédric d'Udekem d'Acoz 17th International Colloquium on Amphipoda |
author_sort |
Verheye, Marie |
title |
Origin, dispersals and diversification dynamics of Epimeriidae and Iphimediidae (Amphipoda Crustacea) from the Antarctic shelf |
title_short |
Origin, dispersals and diversification dynamics of Epimeriidae and Iphimediidae (Amphipoda Crustacea) from the Antarctic shelf |
title_full |
Origin, dispersals and diversification dynamics of Epimeriidae and Iphimediidae (Amphipoda Crustacea) from the Antarctic shelf |
title_fullStr |
Origin, dispersals and diversification dynamics of Epimeriidae and Iphimediidae (Amphipoda Crustacea) from the Antarctic shelf |
title_full_unstemmed |
Origin, dispersals and diversification dynamics of Epimeriidae and Iphimediidae (Amphipoda Crustacea) from the Antarctic shelf |
title_sort |
origin, dispersals and diversification dynamics of epimeriidae and iphimediidae (amphipoda crustacea) from the antarctic shelf |
publisher |
Edizioni Danaus |
publishDate |
2017 |
url |
http://hdl.handle.net/2078.1/191972 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Biodiversity Journal, Vol. 8, p. 621-622 |
op_relation |
boreal:191972 http://hdl.handle.net/2078.1/191972 urn:ISSN:2039-0394 urn:EISSN:2039-0408 |
_version_ |
1798836739921412096 |