Contrasting nonphotochemical quenching patterns under high light and darkness aligns with light niche occupancy in Arctic diatoms
Over the seasons, Arctic diatom species occupy shifting habitats defined by contrasting light climates, constrained by snow and ice cover dynamics interacting with extreme photoperiod and solar angle variations. How Arctic diatom photoadaptation strategies differ across their heterogeneous light nic...
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fttriple:oai:gotriple.eu:http://hdl.handle.net/20.500.11794/66529 2023-05-15T14:38:16+02:00 Contrasting nonphotochemical quenching patterns under high light and darkness aligns with light niche occupancy in Arctic diatoms Croteau, Dany Guérin, Sébastien Bruyant, Flavienne Ferland, Joannie Campbell, Douglas A. Babin, Marcel Lavaud, Johann Arctique, Océan 2020-09-02 https://hdl.handle.net/20.500.11794/66529 en eng Wiley Online Library http://hdl.handle.net/20.500.11794/66529 other CorpusUL envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2020 fttriple https://doi.org/20.500.11794/66529 2023-01-22T18:41:30Z Over the seasons, Arctic diatom species occupy shifting habitats defined by contrasting light climates, constrained by snow and ice cover dynamics interacting with extreme photoperiod and solar angle variations. How Arctic diatom photoadaptation strategies differ across their heterogeneous light niches remains a poorly documented but crucial missing link to anticipate Arctic Ocean responses to shrinking sea-ice and increasing light. To address this question, we selected five Arctic diatom species with diverse life traits, representative of distinct light niches across the seasonal light environment continuum: from snow-covered dimly lit bottom ice to summer stratified waters. We studied their photoacclimation plasticity to two growth light levels and the subsequent responses of their nonphotochemical quenching (NPQ) and xanthophyll cycle to both dark incubations and light shifts. We deciphered NPQ and xanthophyll cycle tuning in darkness and their light-dependent induction kinetics, which aligned with species’ light niche occupancy. In ice-related species, NPQ was sustained in darkness and its induction was more reactive to moderate light shifts. Open-water species triggered strong NPQ induction in darkness and reached higher maximal NPQ under high light. Marginal ice zone species showed strong adaptation to light fluctuations with a dark response fine-tuned depending upon light history. We argue these traits are anchored in diverging photoadaption strategies fostering Arctic diatom success in their respective light niches. Article in Journal/Newspaper Arctic Arctic Ocean Arctique* Sea ice Unknown Arctic Arctic Ocean |
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envir geo Croteau, Dany Guérin, Sébastien Bruyant, Flavienne Ferland, Joannie Campbell, Douglas A. Babin, Marcel Lavaud, Johann Contrasting nonphotochemical quenching patterns under high light and darkness aligns with light niche occupancy in Arctic diatoms |
topic_facet |
envir geo |
description |
Over the seasons, Arctic diatom species occupy shifting habitats defined by contrasting light climates, constrained by snow and ice cover dynamics interacting with extreme photoperiod and solar angle variations. How Arctic diatom photoadaptation strategies differ across their heterogeneous light niches remains a poorly documented but crucial missing link to anticipate Arctic Ocean responses to shrinking sea-ice and increasing light. To address this question, we selected five Arctic diatom species with diverse life traits, representative of distinct light niches across the seasonal light environment continuum: from snow-covered dimly lit bottom ice to summer stratified waters. We studied their photoacclimation plasticity to two growth light levels and the subsequent responses of their nonphotochemical quenching (NPQ) and xanthophyll cycle to both dark incubations and light shifts. We deciphered NPQ and xanthophyll cycle tuning in darkness and their light-dependent induction kinetics, which aligned with species’ light niche occupancy. In ice-related species, NPQ was sustained in darkness and its induction was more reactive to moderate light shifts. Open-water species triggered strong NPQ induction in darkness and reached higher maximal NPQ under high light. Marginal ice zone species showed strong adaptation to light fluctuations with a dark response fine-tuned depending upon light history. We argue these traits are anchored in diverging photoadaption strategies fostering Arctic diatom success in their respective light niches. |
format |
Article in Journal/Newspaper |
author |
Croteau, Dany Guérin, Sébastien Bruyant, Flavienne Ferland, Joannie Campbell, Douglas A. Babin, Marcel Lavaud, Johann |
author_facet |
Croteau, Dany Guérin, Sébastien Bruyant, Flavienne Ferland, Joannie Campbell, Douglas A. Babin, Marcel Lavaud, Johann |
author_sort |
Croteau, Dany |
title |
Contrasting nonphotochemical quenching patterns under high light and darkness aligns with light niche occupancy in Arctic diatoms |
title_short |
Contrasting nonphotochemical quenching patterns under high light and darkness aligns with light niche occupancy in Arctic diatoms |
title_full |
Contrasting nonphotochemical quenching patterns under high light and darkness aligns with light niche occupancy in Arctic diatoms |
title_fullStr |
Contrasting nonphotochemical quenching patterns under high light and darkness aligns with light niche occupancy in Arctic diatoms |
title_full_unstemmed |
Contrasting nonphotochemical quenching patterns under high light and darkness aligns with light niche occupancy in Arctic diatoms |
title_sort |
contrasting nonphotochemical quenching patterns under high light and darkness aligns with light niche occupancy in arctic diatoms |
publisher |
Wiley Online Library |
publishDate |
2020 |
url |
https://hdl.handle.net/20.500.11794/66529 |
op_coverage |
Arctique, Océan |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Arctique* Sea ice |
genre_facet |
Arctic Arctic Ocean Arctique* Sea ice |
op_source |
CorpusUL |
op_relation |
http://hdl.handle.net/20.500.11794/66529 |
op_rights |
other |
op_doi |
https://doi.org/20.500.11794/66529 |
_version_ |
1766310385030266880 |