Balch, William M.; Drapeau, David T.; Poulton, Nicole; Archer, Stephen D.; Cartisano, Carmen; Burnell, Craig; Godrijan, Jelena (2023) Osmotrophy of dissolved organic compounds by coccolithophore populations: Fixation into particulate organic and inorganic carbon. Science advances, 9 (21).
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Abstract
Coccolithophores are typicallythoughtof as photoautotrophs,yet a few genera inhabitsub-euphoticenviron-mentswith insufficientlight for photosynthesis,suggesting that othercarbonacquisitionstrategiesare likely.Field experimentswere performedin the northwest Atlantic(a regionwith potentiallyabundantcoccolitho-phores). Phytoplanktonpopulations were incubated with14C-labeleddissolved organiccarbon(DOC)com-pounds,acetate, mannitol,and glycerol. Coccolithophores were sortedfrom thesepopulations 24 hourslaterusingflow cytometry, and DOC uptake was measured. DOC uptake rates were as high as 10−15molescell−1day−1, slow relative to photosynthesisrates (10−12molescell−1day−1). Growth rates on the organiccompoundswere low, suggesting that osmotrophy plays more of a survivalstrategy in low-lightsituations.Assimilated DOCwas foundin both particulate organiccarbonand calcitecoccoliths(particulate inorganiccarbon),suggestingthat osmotrophicuptake of DOC into coccolithophore calciteis a small but notablepart of the biologicalcarbonpumpand alkalinitypumpparadigms.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | |
| Subjects: | NATURAL SCIENCES > Biology > Microbiology NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science |
| Divisions: | Division for Marine and Enviromental Research |
| Depositing User: | Jelena Godrijan |
| Date Deposited: | 19 Sep 2023 12:12 |
| URI: | http://fulir.irb.hr/id/eprint/8146 |
| DOI: | 10.1126/sciadv.adf6973 |
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