Niche partitioning by photosynthetic plankton as a driver of CO2-fixation across the oligotrophic South Pacific Subtropical Ocean
| Autor: | Clara Martínez-Pérez, Helena Osterholz, Julia Duerschlag, Dhwani K. Desai, Timothy G. Ferdelman, Sten Littmann, Gaute Lavik, Oliver Zielinski, Thorsten Dittmar, Wiebke Mohr, Bernhard Tschitschko, Daniela Voß, Peter Croot, Nina Bartlau, Marcel M. M. Kuypers, Julie LaRoche |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Chlorophyll a
Oceans and Seas Population Biology Microbiology Article chemistry.chemical_compound Ocean gyre RNA Ribosomal 16S Phytoplankton Seawater Photic zone education Ecosystem Ecology Evolution Behavior and Systematics Prochlorococcus South Pacific Gyre education.field_of_study geography Pacific Ocean geography.geographical_feature_category Chlorophyll A Biogeochemistry Carbon Dioxide Plankton biology.organism_classification Biooceanography Oceanography chemistry |
| Zdroj: | The ISME Journal, 16 (2) ISME JOURNAL The ISME Journal |
| ISSN: | 1751-7362 1751-7370 |
| Popis: | Oligotrophic ocean gyre ecosystems may be expanding due to rising global temperatures [1–5]. Models predicting carbon flow through these changing ecosystems require accurate descriptions of phytoplankton communities and their metabolic activities [6]. We therefore measured distributions and activities of cyanobacteria and small photosynthetic eukaryotes throughout the euphotic zone on a zonal transect through the South Pacific Ocean, focusing on the ultraoligotrophic waters of the South Pacific Gyre (SPG). Bulk rates of CO2 fixation were low (0.1 µmol C l−1 d−1) but pervasive throughout both the surface mixed-layer (upper 150 m), as well as the deep chlorophyll a maximum of the core SPG. Chloroplast 16S rRNA metabarcoding, and single-cell 13CO2 uptake experiments demonstrated niche differentiation among the small eukaryotes and picocyanobacteria. Prochlorococcus abundances, activity, and growth were more closely associated with the rims of the gyre. Small, fast-growing, photosynthetic eukaryotes, likely related to the Pelagophyceae, characterized the deep chlorophyll a maximum. In contrast, a slower growing population of photosynthetic eukaryotes, likely comprised of Dictyochophyceae and Chrysophyceae, dominated the mixed layer that contributed 65–88% of the areal CO2 fixation within the core SPG. Small photosynthetic eukaryotes may thus play an underappreciated role in CO2 fixation in the surface mixed-layer waters of ultraoligotrophic ecosystems. The ISME Journal, 16 (2) ISSN:1751-7362 ISSN:1751-7370 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink