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• W2945579575 endingPage "2440" @default.
• W2945579575 startingPage "2424" @default.
• W2945579575 abstract "Abstract We found that in the phosphate (PO 4 )‐depleted western subtropical North Atlantic Ocean, small‐sized pigmented eukaryotes (P‐Euk; < 5 μ m) play a central role in the carbon (C) cycling. Although P‐Euk were only ~ 5% of the microbial phytoplankton cell abundance, they represented at least two thirds of the microbial phytoplankton C biomass and fixed more CO 2 than picocyanobacteria, accounting for roughly half of the volumetric CO 2 fixation by the microbial phytoplankton, or a third of the total primary production. Cell‐specific PO 4 assimilation rates of P‐Euk and nonpigmented eukaryotes (NP‐Euk; < 5 μ m) were generally higher than of picocyanobacteria. However, when normalized to biovolumes, picocyanobacteria assimilated roughly four times more PO 4 than small eukaryotes, indicating different strategies to cope with PO 4 limitation. Our results underline an imbalance in the CO 2 : PO 4 uptake rate ratios, which may be explained by phagotrophic predation providing mixotrophic protists with their largest source of PO 4 . 18S rDNA amplicon sequence analyses suggested that P‐Euk was dominated by members of green algae and dinoflagellates, the latter group commonly mixotrophic, whereas marine alveolates were the dominant NP‐Euk. Bacterivory by P‐Euk (0.9 ± 0.3 bacteria P‐Euk −1 h −1 ) was comparable to values previously measured in the central North Atlantic, indicating that small mixotrophic eukaryotes likely exhibit similar predatory pressure on bacteria. Interestingly, bacterivory rates were reduced when PO 4 was added during experimental incubations, indicating that feeding rate by P‐Euk is regulated by PO 4 availability. This may be in response to the higher cost associated with assimilating PO 4 by phagocytosis compared to osmotrophy." @default.
• W2945579575 created "2019-05-29" @default.
• W2945579575 creator A5002539452 @default.
• W2945579575 creator A5059742751 @default.
• W2945579575 creator A5064324359 @default.
• W2945579575 creator A5071269669 @default.
• W2945579575 date "2019-05-17" @default.
• W2945579575 modified "2023-10-11" @default.
• W2945579575 title "Small pigmented eukaryotes play a major role in carbon cycling in the P‐depleted western subtropical North Atlantic, which may be supported by mixotrophy" @default.
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