Diversification, evolution and sub-functionalization of 70kDa heat-shock proteins in two sister species of Antarctic krill: differences in thermal habitats, responses and implications under climate change
A comparative thermal tolerance study was undertaken on two sister species of Euphausiids (Antarctic krills) Euphausia superba and Euphausia crystallorophias. Both are essential components of the Southern Ocean ecosystem, but occupy distinct environmental geographical locations with slightly differe...
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ftnerc:oai:nora.nerc.ac.uk:510629 2023-05-15T13:49:32+02:00 Diversification, evolution and sub-functionalization of 70kDa heat-shock proteins in two sister species of Antarctic krill: differences in thermal habitats, responses and implications under climate change Cascella, Kévin Jollivet, Didier Papot, Claire Léger, Nelly Corre, Erwan Ravaux, Juliette Clark, Melody S. Toullec, Jean-Yves 2015-04-02 text http://nora.nerc.ac.uk/id/eprint/510629/ https://nora.nerc.ac.uk/id/eprint/510629/1/Clark.pdf https://doi.org/10.1371/journal.pone.0121642 en eng Public Library of Science https://nora.nerc.ac.uk/id/eprint/510629/1/Clark.pdf Cascella, Kévin; Jollivet, Didier; Papot, Claire; Léger, Nelly; Corre, Erwan; Ravaux, Juliette; Clark, Melody S. orcid:0000-0002-3442-3824 Toullec, Jean-Yves. 2015 Diversification, evolution and sub-functionalization of 70kDa heat-shock proteins in two sister species of Antarctic krill: differences in thermal habitats, responses and implications under climate change. PLOS ONE, 10 (4), e0121642. 23, pp. https://doi.org/10.1371/journal.pone.0121642 <https://doi.org/10.1371/journal.pone.0121642> cc_by_4 CC-BY Publication - Article PeerReviewed 2015 ftnerc https://doi.org/10.1371/journal.pone.0121642 2023-02-04T19:41:30Z A comparative thermal tolerance study was undertaken on two sister species of Euphausiids (Antarctic krills) Euphausia superba and Euphausia crystallorophias. Both are essential components of the Southern Ocean ecosystem, but occupy distinct environmental geographical locations with slightly different temperature regimes. They therefore provide a useful model system for the investigation of adaptations to thermal tolerance. Methodology/Principal Finding Initial CTmax studies showed that E. superba was slightly more thermotolerant than E. crystallorophias. Five Hsp70 mRNAs were characterized from the RNAseq data of both species and subsequent expression kinetics studies revealed notable differences in induction of each of the 5 orthologues between the two species, with E. crystallorophias reacting more rapidly than E. superba. Furthermore, analyses conducted to estimate the evolutionary rates and selection strengths acting on each gene tended to support the hypothesis that diversifying selection has contributed to the diversification of this gene family, and led to the selective relaxation on the inducible C form with its possible loss of function in the two krill species. Conclusions The sensitivity of the epipelagic species E. crystallorophias to temperature variations and/or its adaptation to cold is enhanced when compared with its sister species, E. superba. These results indicate that ice krill could be the first of the two species to be impacted by the warming of coastal waters of the Austral ocean in the coming years due to climate change. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Austral Ocean Euphausia superba Southern Ocean Natural Environment Research Council: NERC Open Research Archive Antarctic Southern Ocean Austral Austral Ocean ENVELOPE(90.000,90.000,-60.000,-60.000) PLOS ONE 10 4 e0121642 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
English |
description |
A comparative thermal tolerance study was undertaken on two sister species of Euphausiids (Antarctic krills) Euphausia superba and Euphausia crystallorophias. Both are essential components of the Southern Ocean ecosystem, but occupy distinct environmental geographical locations with slightly different temperature regimes. They therefore provide a useful model system for the investigation of adaptations to thermal tolerance. Methodology/Principal Finding Initial CTmax studies showed that E. superba was slightly more thermotolerant than E. crystallorophias. Five Hsp70 mRNAs were characterized from the RNAseq data of both species and subsequent expression kinetics studies revealed notable differences in induction of each of the 5 orthologues between the two species, with E. crystallorophias reacting more rapidly than E. superba. Furthermore, analyses conducted to estimate the evolutionary rates and selection strengths acting on each gene tended to support the hypothesis that diversifying selection has contributed to the diversification of this gene family, and led to the selective relaxation on the inducible C form with its possible loss of function in the two krill species. Conclusions The sensitivity of the epipelagic species E. crystallorophias to temperature variations and/or its adaptation to cold is enhanced when compared with its sister species, E. superba. These results indicate that ice krill could be the first of the two species to be impacted by the warming of coastal waters of the Austral ocean in the coming years due to climate change. |
format |
Article in Journal/Newspaper |
author |
Cascella, Kévin Jollivet, Didier Papot, Claire Léger, Nelly Corre, Erwan Ravaux, Juliette Clark, Melody S. Toullec, Jean-Yves |
spellingShingle |
Cascella, Kévin Jollivet, Didier Papot, Claire Léger, Nelly Corre, Erwan Ravaux, Juliette Clark, Melody S. Toullec, Jean-Yves Diversification, evolution and sub-functionalization of 70kDa heat-shock proteins in two sister species of Antarctic krill: differences in thermal habitats, responses and implications under climate change |
author_facet |
Cascella, Kévin Jollivet, Didier Papot, Claire Léger, Nelly Corre, Erwan Ravaux, Juliette Clark, Melody S. Toullec, Jean-Yves |
author_sort |
Cascella, Kévin |
title |
Diversification, evolution and sub-functionalization of 70kDa heat-shock proteins in two sister species of Antarctic krill: differences in thermal habitats, responses and implications under climate change |
title_short |
Diversification, evolution and sub-functionalization of 70kDa heat-shock proteins in two sister species of Antarctic krill: differences in thermal habitats, responses and implications under climate change |
title_full |
Diversification, evolution and sub-functionalization of 70kDa heat-shock proteins in two sister species of Antarctic krill: differences in thermal habitats, responses and implications under climate change |
title_fullStr |
Diversification, evolution and sub-functionalization of 70kDa heat-shock proteins in two sister species of Antarctic krill: differences in thermal habitats, responses and implications under climate change |
title_full_unstemmed |
Diversification, evolution and sub-functionalization of 70kDa heat-shock proteins in two sister species of Antarctic krill: differences in thermal habitats, responses and implications under climate change |
title_sort |
diversification, evolution and sub-functionalization of 70kda heat-shock proteins in two sister species of antarctic krill: differences in thermal habitats, responses and implications under climate change |
publisher |
Public Library of Science |
publishDate |
2015 |
url |
http://nora.nerc.ac.uk/id/eprint/510629/ https://nora.nerc.ac.uk/id/eprint/510629/1/Clark.pdf https://doi.org/10.1371/journal.pone.0121642 |
long_lat |
ENVELOPE(90.000,90.000,-60.000,-60.000) |
geographic |
Antarctic Southern Ocean Austral Austral Ocean |
geographic_facet |
Antarctic Southern Ocean Austral Austral Ocean |
genre |
Antarc* Antarctic Antarctic Krill Austral Ocean Euphausia superba Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Austral Ocean Euphausia superba Southern Ocean |
op_relation |
https://nora.nerc.ac.uk/id/eprint/510629/1/Clark.pdf Cascella, Kévin; Jollivet, Didier; Papot, Claire; Léger, Nelly; Corre, Erwan; Ravaux, Juliette; Clark, Melody S. orcid:0000-0002-3442-3824 Toullec, Jean-Yves. 2015 Diversification, evolution and sub-functionalization of 70kDa heat-shock proteins in two sister species of Antarctic krill: differences in thermal habitats, responses and implications under climate change. PLOS ONE, 10 (4), e0121642. 23, pp. https://doi.org/10.1371/journal.pone.0121642 <https://doi.org/10.1371/journal.pone.0121642> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0121642 |
container_title |
PLOS ONE |
container_volume |
10 |
container_issue |
4 |
container_start_page |
e0121642 |
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1766251487241961472 |