Estimating the actual biodiversity and evolutionary history of the amphipod genus Eusirus in the Southern Ocean
The diversity of the Antarctic marine fauna has been shaped by various evolutionary processes (dispersals, diversifications, extinctions), which were greatly influenced by the geological and climatic history of the region. Some Antarctic lineages are descendants of Gondwanan ancestors and arose by v...
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ftorbi:oai:orbi.ulg.ac.be:2268/239202 2024-04-21T07:49:42+00:00 Estimating the actual biodiversity and evolutionary history of the amphipod genus Eusirus in the Southern Ocean Salabao, Louraine Frederich, Bruno Lepoint, Gilles Verheye, Marie Schön, Isa 2019-08-27 https://orbi.uliege.be/handle/2268/239202 en eng https://orbi.uliege.be/handle/2268/239202 info:hdl:2268/239202 18th International Colloquium on Amphipoda (ICA), 26-8-2019 to 30-8-2019 Eusirus biodiversity evolutionary history amphipods Antarctica Life sciences Genetics & genetic processes Environmental sciences & ecology Aquatic sciences & oceanology Zoology Sciences du vivant Génétique & processus génétiques Sciences de l’environnement & écologie Sciences aquatiques & océanologie Zoologie conference poster not in proceedings http://purl.org/coar/resource_type/c_18co info:eu-repo/semantics/conferencePoster 2019 ftorbi 2024-03-27T14:49:44Z The diversity of the Antarctic marine fauna has been shaped by various evolutionary processes (dispersals, diversifications, extinctions), which were greatly influenced by the geological and climatic history of the region. Some Antarctic lineages are descendants of Gondwanan ancestors and arose by vicariance during the progressive breakup of Gondwana, which ultimately led to the complete geographical isolation of the Antarctic continent. The Plio-Pleistocene glacial cycles have been inferred to act as a “diversity pump” on the Antarctic continental shelf. Allopatric speciation of less dispersive organisms could have resulted from the isolation of populations in ice-free refugia during the glacial advances. These glacial cycles were often suggested to have influenced the diversification of numerous complexes of closely related and morphologically very similar Antarctic species. The continuous discovery of such (pseudo-) cryptic species in the Southern Ocean suggests that its biodiversity is currently greatly underestimated. Such species complexes have been found in the amphipod genus Eusirus. In a preliminary phylogeny (COI and 28S) of the whole genus, some Antarctic nominal Eusirus species are composed of genetically distant clades, suggesting putative new species. In this study, we will sequence complete mitochondrial genomes, using a combination of skim sequencing and long-range PCRs of different Eusirus species, to which sequence data from nuclear (28S, ITS2) will be added. By greatly increasing character sampling as well as taxon sampling (including Antarctic and non-Antarctic species) compared to preliminary studies, we intend to reconstruct a robust phylogeny of the genus. Based on this DNA dataset and the phylogeny, we aim to (1) provide a better estimate of the actual diversity within the genus, using various DNA-based species delimitation methods (GMYC, PTP, 4 theta rule and ABDG) and; (2) provide a better understanding of their evolutionary history: where does the Antarctic clade come from? Did Eusirus ... Conference Object Antarc* Antarctic Antarctica Southern Ocean University of Liège: ORBi (Open Repository and Bibliography) |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Eusirus biodiversity evolutionary history amphipods Antarctica Life sciences Genetics & genetic processes Environmental sciences & ecology Aquatic sciences & oceanology Zoology Sciences du vivant Génétique & processus génétiques Sciences de l’environnement & écologie Sciences aquatiques & océanologie Zoologie |
spellingShingle |
Eusirus biodiversity evolutionary history amphipods Antarctica Life sciences Genetics & genetic processes Environmental sciences & ecology Aquatic sciences & oceanology Zoology Sciences du vivant Génétique & processus génétiques Sciences de l’environnement & écologie Sciences aquatiques & océanologie Zoologie Salabao, Louraine Frederich, Bruno Lepoint, Gilles Verheye, Marie Schön, Isa Estimating the actual biodiversity and evolutionary history of the amphipod genus Eusirus in the Southern Ocean |
topic_facet |
Eusirus biodiversity evolutionary history amphipods Antarctica Life sciences Genetics & genetic processes Environmental sciences & ecology Aquatic sciences & oceanology Zoology Sciences du vivant Génétique & processus génétiques Sciences de l’environnement & écologie Sciences aquatiques & océanologie Zoologie |
description |
The diversity of the Antarctic marine fauna has been shaped by various evolutionary processes (dispersals, diversifications, extinctions), which were greatly influenced by the geological and climatic history of the region. Some Antarctic lineages are descendants of Gondwanan ancestors and arose by vicariance during the progressive breakup of Gondwana, which ultimately led to the complete geographical isolation of the Antarctic continent. The Plio-Pleistocene glacial cycles have been inferred to act as a “diversity pump” on the Antarctic continental shelf. Allopatric speciation of less dispersive organisms could have resulted from the isolation of populations in ice-free refugia during the glacial advances. These glacial cycles were often suggested to have influenced the diversification of numerous complexes of closely related and morphologically very similar Antarctic species. The continuous discovery of such (pseudo-) cryptic species in the Southern Ocean suggests that its biodiversity is currently greatly underestimated. Such species complexes have been found in the amphipod genus Eusirus. In a preliminary phylogeny (COI and 28S) of the whole genus, some Antarctic nominal Eusirus species are composed of genetically distant clades, suggesting putative new species. In this study, we will sequence complete mitochondrial genomes, using a combination of skim sequencing and long-range PCRs of different Eusirus species, to which sequence data from nuclear (28S, ITS2) will be added. By greatly increasing character sampling as well as taxon sampling (including Antarctic and non-Antarctic species) compared to preliminary studies, we intend to reconstruct a robust phylogeny of the genus. Based on this DNA dataset and the phylogeny, we aim to (1) provide a better estimate of the actual diversity within the genus, using various DNA-based species delimitation methods (GMYC, PTP, 4 theta rule and ABDG) and; (2) provide a better understanding of their evolutionary history: where does the Antarctic clade come from? Did Eusirus ... |
format |
Conference Object |
author |
Salabao, Louraine Frederich, Bruno Lepoint, Gilles Verheye, Marie Schön, Isa |
author_facet |
Salabao, Louraine Frederich, Bruno Lepoint, Gilles Verheye, Marie Schön, Isa |
author_sort |
Salabao, Louraine |
title |
Estimating the actual biodiversity and evolutionary history of the amphipod genus Eusirus in the Southern Ocean |
title_short |
Estimating the actual biodiversity and evolutionary history of the amphipod genus Eusirus in the Southern Ocean |
title_full |
Estimating the actual biodiversity and evolutionary history of the amphipod genus Eusirus in the Southern Ocean |
title_fullStr |
Estimating the actual biodiversity and evolutionary history of the amphipod genus Eusirus in the Southern Ocean |
title_full_unstemmed |
Estimating the actual biodiversity and evolutionary history of the amphipod genus Eusirus in the Southern Ocean |
title_sort |
estimating the actual biodiversity and evolutionary history of the amphipod genus eusirus in the southern ocean |
publishDate |
2019 |
url |
https://orbi.uliege.be/handle/2268/239202 |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_source |
18th International Colloquium on Amphipoda (ICA), 26-8-2019 to 30-8-2019 |
op_relation |
https://orbi.uliege.be/handle/2268/239202 info:hdl:2268/239202 |
_version_ |
1796933713912659968 |