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
Background 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 sligh...
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ftarchimer:oai:archimer.ifremer.fr:40445 2023-05-15T13:50:50+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, Kevin Jollivet, Didier Papot, Claire Leger, Nelly Corre, Erwan Ravaux, Juliette Clark, Melody S. Toullec, Jean-yves 2015-04 application/pdf https://archimer.ifremer.fr/doc/00293/40445/39081.pdf https://doi.org/10.1371/journal.pone.0121642 https://archimer.ifremer.fr/doc/00293/40445/ eng eng Public Library Science https://archimer.ifremer.fr/doc/00293/40445/39081.pdf doi:10.1371/journal.pone.0121642 https://archimer.ifremer.fr/doc/00293/40445/ 2015 Cascella et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. info:eu-repo/semantics/openAccess restricted use CC-BY Plos One (1932-6203) (Public Library Science), 2015-04 , Vol. 10 , N. 4 , P. e0121642 text Publication info:eu-repo/semantics/article 2015 ftarchimer https://doi.org/10.1371/journal.pone.0121642 2021-09-23T20:26:57Z Background 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 Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Austral Austral Ocean ENVELOPE(90.000,90.000,-60.000,-60.000) Southern Ocean PLOS ONE 10 4 e0121642 |
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Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
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ftarchimer |
language |
English |
description |
Background 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, Kevin Jollivet, Didier Papot, Claire Leger, Nelly Corre, Erwan Ravaux, Juliette Clark, Melody S. Toullec, Jean-yves |
spellingShingle |
Cascella, Kevin Jollivet, Didier Papot, Claire Leger, 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, Kevin Jollivet, Didier Papot, Claire Leger, Nelly Corre, Erwan Ravaux, Juliette Clark, Melody S. Toullec, Jean-yves |
author_sort |
Cascella, Kevin |
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 Science |
publishDate |
2015 |
url |
https://archimer.ifremer.fr/doc/00293/40445/39081.pdf https://doi.org/10.1371/journal.pone.0121642 https://archimer.ifremer.fr/doc/00293/40445/ |
long_lat |
ENVELOPE(90.000,90.000,-60.000,-60.000) |
geographic |
Antarctic Austral Austral Ocean Southern Ocean |
geographic_facet |
Antarctic Austral Austral Ocean Southern 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_source |
Plos One (1932-6203) (Public Library Science), 2015-04 , Vol. 10 , N. 4 , P. e0121642 |
op_relation |
https://archimer.ifremer.fr/doc/00293/40445/39081.pdf doi:10.1371/journal.pone.0121642 https://archimer.ifremer.fr/doc/00293/40445/ |
op_rights |
2015 Cascella et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. info:eu-repo/semantics/openAccess restricted use |
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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1766254146932965376 |