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Genomic adaptation of the picoeukaryote $Pelagomonas\ calceolata$ to iron-poor oceans revealed by a chromosome-scale genome sequence

Abstract : The smallest phytoplankton species are key actors in oceans biogeochemical cycling and their abundance and distribution are affected with global environmental changes. Among them, algae of the Pelagophyceae class encompass coastal species causative of harmful algal blooms while others are cosmopolitan and abundant. The lack of genomic reference in this lineage is a main limitation to study its ecological importance. Here, we analysed Pelagomonas calceolata relative abundance, ecological niche and potential for the adaptation in all oceans using a complete chromosome-scale assembled genome sequence. Our results show that P. calceolata is one of the most abundant eukaryotic species in the oceans with a relative abundance favoured by high temperature, low-light and iron-poor conditions. Climate change projections based on its relative abundance suggest an extension of the P. calceolata habitat toward the poles at the end of this century. Finally, we observed a specific gene repertoire and expression level variations potentially explaining its ecological success in low-iron and low-nitrate environments. Collectively, these findings reveal the ecological importance of P. calceolata and lay the foundation for a global scale analysis of the adaptation and acclimation strategies of this small phytoplankton in a changing environment.
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https://hal-cea.archives-ouvertes.fr/cea-03791710
Contributor : Quentin Carradec Connect in order to contact the contributor
Submitted on : Thursday, September 29, 2022 - 2:39:40 PM
Last modification on : Saturday, October 1, 2022 - 3:52:43 AM

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Nina Guérin, Marta Ciccarella, Elisa Flamant, Paul Frémont, Sophie Mangenot, et al.. Genomic adaptation of the picoeukaryote $Pelagomonas\ calceolata$ to iron-poor oceans revealed by a chromosome-scale genome sequence. Communications Biology, 2022, 5 (1), pp.983. ⟨10.1038/s42003-022-03939-z⟩. ⟨cea-03791710⟩

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