Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments
Abstract Background Dispersal ability, population genetic structure and species divergence in marine nematodes are still poorly understood, especially in remote areas such as the Southern Ocean. We investigated genetic differentiation of species and populations of the free-living endobenthic nematod...
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ftdatacite:10.6084/m9.figshare.c.3791023 2023-05-15T13:43:34+02:00 Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments Freija Hauquier Leliaert, Frederik Rigaux, Annelien Derycke, Sofie Vanreusel, Ann 2017 https://dx.doi.org/10.6084/m9.figshare.c.3791023 https://figshare.com/collections/Distinct_genetic_differentiation_and_species_diversification_within_two_marine_nematodes_with_different_habitat_preference_in_Antarctic_sediments/3791023 unknown Figshare https://dx.doi.org/10.1186/s12862-017-0968-1 CC BY https://creativecommons.org/licenses/by/4.0 CC-BY Genetics FOS Biological sciences Evolutionary Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Marine Biology Inorganic Chemistry FOS Chemical sciences Collection article 2017 ftdatacite https://doi.org/10.6084/m9.figshare.c.3791023 https://doi.org/10.1186/s12862-017-0968-1 2021-11-05T12:55:41Z Abstract Background Dispersal ability, population genetic structure and species divergence in marine nematodes are still poorly understood, especially in remote areas such as the Southern Ocean. We investigated genetic differentiation of species and populations of the free-living endobenthic nematode genera Sabatieria and Desmodora using nuclear 18S rDNA, internal transcribed spacer (ITS) rDNA, and mitochondrial cytochrome oxidase I (COI) gene sequences. Specimens were collected at continental shelf depths (200â 500Â m) near the Antarctic Peninsula, Scotia Arc and eastern side of the Weddell Sea. The two nematode genera co-occurred at all sampled locations, but with different vertical distribution in the sediment. A combination of phylogenetic (GMYC, Bayesian Inference, Maximum Likelihood) and population genetic (AMOVA) analyses were used for species delimitation and assessment of gene flow between sampling locations. Results Sequence analyses resulted in the delimitation of four divergent species lineages in Sabatieria, two of which could not be discriminated morphologically and most likely constitute cryptic species. Two species were recognised in Desmodora, one of which showed large intraspecific morphological variation. Both genera comprised species that were restricted to one side of the Weddell Sea and species that were widely spread across it. Population genetic structuring was highly significant and more pronounced in the deeper sediment-dwelling Sabatieria species, which are generally less prone to resuspension and passive dispersal in the water column than surface Desmodora species. Conclusions Our results indicate that gene flow is restricted at large geographic distance in the Southern Ocean, which casts doubt on the efficiency of the Weddell gyre and Antarctic Circumpolar Current in facilitating circum-Antarctic nematode species distributions. We also show that genetic structuring and cryptic speciation can be very different in nematode species isolated from the same geographic area, but with different habitat preferences (surface versus deeper sediment layers). Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Southern Ocean Weddell Sea DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Weddell |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Genetics FOS Biological sciences Evolutionary Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Marine Biology Inorganic Chemistry FOS Chemical sciences |
spellingShingle |
Genetics FOS Biological sciences Evolutionary Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Marine Biology Inorganic Chemistry FOS Chemical sciences Freija Hauquier Leliaert, Frederik Rigaux, Annelien Derycke, Sofie Vanreusel, Ann Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments |
topic_facet |
Genetics FOS Biological sciences Evolutionary Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences Ecology 69999 Biological Sciences not elsewhere classified Marine Biology Inorganic Chemistry FOS Chemical sciences |
description |
Abstract Background Dispersal ability, population genetic structure and species divergence in marine nematodes are still poorly understood, especially in remote areas such as the Southern Ocean. We investigated genetic differentiation of species and populations of the free-living endobenthic nematode genera Sabatieria and Desmodora using nuclear 18S rDNA, internal transcribed spacer (ITS) rDNA, and mitochondrial cytochrome oxidase I (COI) gene sequences. Specimens were collected at continental shelf depths (200â 500Â m) near the Antarctic Peninsula, Scotia Arc and eastern side of the Weddell Sea. The two nematode genera co-occurred at all sampled locations, but with different vertical distribution in the sediment. A combination of phylogenetic (GMYC, Bayesian Inference, Maximum Likelihood) and population genetic (AMOVA) analyses were used for species delimitation and assessment of gene flow between sampling locations. Results Sequence analyses resulted in the delimitation of four divergent species lineages in Sabatieria, two of which could not be discriminated morphologically and most likely constitute cryptic species. Two species were recognised in Desmodora, one of which showed large intraspecific morphological variation. Both genera comprised species that were restricted to one side of the Weddell Sea and species that were widely spread across it. Population genetic structuring was highly significant and more pronounced in the deeper sediment-dwelling Sabatieria species, which are generally less prone to resuspension and passive dispersal in the water column than surface Desmodora species. Conclusions Our results indicate that gene flow is restricted at large geographic distance in the Southern Ocean, which casts doubt on the efficiency of the Weddell gyre and Antarctic Circumpolar Current in facilitating circum-Antarctic nematode species distributions. We also show that genetic structuring and cryptic speciation can be very different in nematode species isolated from the same geographic area, but with different habitat preferences (surface versus deeper sediment layers). |
format |
Article in Journal/Newspaper |
author |
Freija Hauquier Leliaert, Frederik Rigaux, Annelien Derycke, Sofie Vanreusel, Ann |
author_facet |
Freija Hauquier Leliaert, Frederik Rigaux, Annelien Derycke, Sofie Vanreusel, Ann |
author_sort |
Freija Hauquier |
title |
Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments |
title_short |
Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments |
title_full |
Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments |
title_fullStr |
Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments |
title_full_unstemmed |
Distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in Antarctic sediments |
title_sort |
distinct genetic differentiation and species diversification within two marine nematodes with different habitat preference in antarctic sediments |
publisher |
Figshare |
publishDate |
2017 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.3791023 https://figshare.com/collections/Distinct_genetic_differentiation_and_species_diversification_within_two_marine_nematodes_with_different_habitat_preference_in_Antarctic_sediments/3791023 |
geographic |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Weddell |
geographic_facet |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula Weddell Sea Weddell |
genre |
Antarc* Antarctic Antarctic Peninsula Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Southern Ocean Weddell Sea |
op_relation |
https://dx.doi.org/10.1186/s12862-017-0968-1 |
op_rights |
CC BY https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.3791023 https://doi.org/10.1186/s12862-017-0968-1 |
_version_ |
1766190629814009856 |