Global distribution patterns of marine nitrogen-fixers by imaging and molecular methods
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Non |
| Statut de publication | : | Publié |
| Année de publication | : | 2020 |
| Auteurs (13) | : | KARLUSICH Juan,jose,pierella PELLETIER Eric CARSIQUE Madeline DVORAK Etienne COLIN Sébastien PICHERAL Marc PEPPERKOK Rainer KARSENTI Eric DE VARGAS Colomban LOMBARD Fabien WINCKER Patrick BOWLER Chris FOSTER R,a |
| Revue scientifique | : | bioRxiv |
| Volume | : | |
| Fascicule | : | |
| Pages | : | |
| DOI | : | 10.1101/2020.10.17.343731 |
| URL | : | http://biorxiv.org/content/early/2020/10/17/2020.10.17.343731.abstract |
| Abstract | : | Biological nitrogen fixation sustains ~50% of ocean primary production. However, our understanding of marine N2-fixers (diazotrophs) is hindered by limited observations. Here, we developed a quantitative image analysis pipeline in concert with mapping of molecular markers for mining >2,000,000 images and >1,300 metagenomes from Tara Oceans, covering surface, deep chlorophyll maximum and mesopelagic layers across 6 organismal size fractions (0-2000 μm). Imaging and molecular data were remarkably congruent. Diazotrophs were detected from ultrasmall bacterioplankton (<0.2 μm) to mesoplankton (180 to 2000 μm). We identified several new high density regions of diazotrophs. Distributional and abundance patterns support the previous canonical view that larger sized diazotrophs (>10 μm) dominate the tropical belts, while unicellular diazotrophs were found in surface and mesopelagic samples. Multiple co-occurring diazotrophic lineages were frequently encountered, suggesting that complex overlapping niches are common. Overall, this work provides an updated global snapshot of marine diazotroph biogeographical diversity and highlights new sources and sinks of diazotroph-fueled new production. |
| Mots-clés | : | - |
| Commentaire | : | - |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Karlusich JJP, Pelletier E, Carsique M, Dvorak E, Colin S, Picheral M, Pepperkok R, Karsenti E, De Vargas C, Lombard F, Wincker P, Bowler C, Foster RA (2020) Global distribution patterns of marine nitrogen-fixers by imaging and molecular methods. bioRxiv | doi: 10.1101/2020.10.17.343731
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