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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fttriple:oai:gotriple.eu:10670/1.hsldzo 2023-05-15T13:50:40+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 https://doi.org/10.1371/journal.pone.0121642 https://archimer.ifremer.fr/doc/00293/40445/39081.pdf https://archimer.ifremer.fr/doc/00293/40445/ en eng Public Library Science doi:10.1371/journal.pone.0121642 10670/1.hsldzo https://archimer.ifremer.fr/doc/00293/40445/39081.pdf https://archimer.ifremer.fr/doc/00293/40445/ other Archimer, archive institutionnelle de l'Ifremer Plos One (1932-6203) (Public Library Science), 2015-04 , Vol. 10 , N. 4 , P. e0121642 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1371/journal.pone.0121642 2023-01-22T18:23:43Z 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. Text Antarc* Antarctic Antarctic Krill Austral Ocean Euphausia superba Southern Ocean Unknown Antarctic Austral Austral Ocean ENVELOPE(90.000,90.000,-60.000,-60.000) Southern Ocean PLOS ONE 10 4 e0121642 |
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envir geo 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 |
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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 |
Text |
author |
Cascella, Kevin Jollivet, Didier Papot, Claire Leger, Nelly Corre, Erwan Ravaux, Juliette Clark, Melody S. Toullec, Jean-yves |
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 |
url |
https://doi.org/10.1371/journal.pone.0121642 https://archimer.ifremer.fr/doc/00293/40445/39081.pdf 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 |
Archimer, archive institutionnelle de l'Ifremer Plos One (1932-6203) (Public Library Science), 2015-04 , Vol. 10 , N. 4 , P. e0121642 |
op_relation |
doi:10.1371/journal.pone.0121642 10670/1.hsldzo https://archimer.ifremer.fr/doc/00293/40445/39081.pdf https://archimer.ifremer.fr/doc/00293/40445/ |
op_rights |
other |
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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1766253836464291840 |