The University of Southampton
University of Southampton Institutional Repository

Cell-specific CO2 fixation rates of two distinct groups of plastidic protists in the Atlantic Ocean remain unchanged after nutrient addition

Cell-specific CO2 fixation rates of two distinct groups of plastidic protists in the Atlantic Ocean remain unchanged after nutrient addition
Cell-specific CO2 fixation rates of two distinct groups of plastidic protists in the Atlantic Ocean remain unchanged after nutrient addition
To assess the role of open-ocean ecosystems in global CO2 fixation, we investigated how picophytoplankton, which dominate primary production, responded to episodic increases in nutrient availability. Previous experiments have shown nitrogen alone, or in combination with phosphorus or iron, to be the proximate limiting nutrient(s) for total phytoplankton grown over several days. Much less is known about how nutrient upshift affects picophytoplankton CO2 fixation over the duration of the light period. To address this issue, we performed a series of small volume (8–60?ml) – short term (10–11?h) nutrient addition experiments in different regions of the Atlantic Ocean using NH4Cl, FeCl3, K medium, dust and nutrient-rich water from 300?m depth. We found no significant nutrient stimulation of group-specific CO2 fixation rates of two taxonomically and size-distinct groups of plastidic protists. The above was true regardless of the region sampled or nutrient added, suggesting that this is a generic phenomenon. Our findings show that at least in the short term (i.e. daylight period), nutrient availability does not limit CO2 fixation by the smallest plastidic protists, while their taxonomic composition does not determine their response to nutrient addition.
1758-2229
211-218
Grob, Carolina
fa3203be-7eb7-4f75-8fb9-9d9492f6f320
Jardillier, Ludwig
643eb51e-f80a-431c-ad72-9eed75e0cce9
Hartmann, Manuela
5b175765-fde7-40dc-bcd6-83248285ef86
Ostrowski, Martin
faffaad6-2f86-4de4-9c20-2718de2cff67
Zubkov, Mikhail V.
b1dfb3a0-bcff-430c-9031-358a22b50743
Scanlan, David J.
748c7970-2e58-4a46-82ad-0138f41bd713
Grob, Carolina
fa3203be-7eb7-4f75-8fb9-9d9492f6f320
Jardillier, Ludwig
643eb51e-f80a-431c-ad72-9eed75e0cce9
Hartmann, Manuela
5b175765-fde7-40dc-bcd6-83248285ef86
Ostrowski, Martin
faffaad6-2f86-4de4-9c20-2718de2cff67
Zubkov, Mikhail V.
b1dfb3a0-bcff-430c-9031-358a22b50743
Scanlan, David J.
748c7970-2e58-4a46-82ad-0138f41bd713

Grob, Carolina, Jardillier, Ludwig, Hartmann, Manuela, Ostrowski, Martin, Zubkov, Mikhail V. and Scanlan, David J. (2015) Cell-specific CO2 fixation rates of two distinct groups of plastidic protists in the Atlantic Ocean remain unchanged after nutrient addition. Environmental Microbiology Reports, 7 (2), 211-218. (doi:10.1111/1758-2229.12228).

Record type: Article

Abstract

To assess the role of open-ocean ecosystems in global CO2 fixation, we investigated how picophytoplankton, which dominate primary production, responded to episodic increases in nutrient availability. Previous experiments have shown nitrogen alone, or in combination with phosphorus or iron, to be the proximate limiting nutrient(s) for total phytoplankton grown over several days. Much less is known about how nutrient upshift affects picophytoplankton CO2 fixation over the duration of the light period. To address this issue, we performed a series of small volume (8–60?ml) – short term (10–11?h) nutrient addition experiments in different regions of the Atlantic Ocean using NH4Cl, FeCl3, K medium, dust and nutrient-rich water from 300?m depth. We found no significant nutrient stimulation of group-specific CO2 fixation rates of two taxonomically and size-distinct groups of plastidic protists. The above was true regardless of the region sampled or nutrient added, suggesting that this is a generic phenomenon. Our findings show that at least in the short term (i.e. daylight period), nutrient availability does not limit CO2 fixation by the smallest plastidic protists, while their taxonomic composition does not determine their response to nutrient addition.

This record has no associated files available for download.

More information

Accepted/In Press date: 23 January 2015
Published date: April 2015
Organisations: Marine Biogeochemistry

Identifiers

Local EPrints ID: 373726
URI: http://eprints.soton.ac.uk/id/eprint/373726
ISSN: 1758-2229
PURE UUID: a1e3fe6d-1383-469c-876c-35f7f23c615e

Catalogue record

Date deposited: 26 Jan 2015 14:33
Last modified: 14 Mar 2024 18:56

Export record

Altmetrics

Contributors

Author: Carolina Grob
Author: Ludwig Jardillier
Author: Manuela Hartmann
Author: Martin Ostrowski
Author: Mikhail V. Zubkov
Author: David J. Scanlan

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×