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Mixotrophic basis of Atlantic oligotrophic ecosystems
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Hartmann, Manuela, Grob, Carolina, Tarran, Glen A., Martin, Adrian P., Burkill, Peter H., Scanlan, David J. and Zubkov, Mikhail V. (2012) Mixotrophic basis of Atlantic oligotrophic ecosystems. Proceedings of the National Academy of Sciences, Volume 109 (Number 15). pp. 5756-5760. doi:10.1073/pnas.1118179109
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Official URL: http://dx.doi.org/10.1073/pnas.1118179109
Abstract
Oligotrophic subtropical gyres are the largest oceanic ecosystems, covering >40% of the Earth's surface. Unicellular cyanobacteria and the smallest algae (plastidic protists) dominate CO2 fixation in these ecosystems, competing for dissolved inorganic nutrients. Here we present direct evidence from the surface mixed layer of the subtropical gyres and adjacent equatorial and temperate regions of the Atlantic Ocean, collected on three Atlantic Meridional Transect cruises on consecutive years, that bacterioplankton are fed on by plastidic and aplastidic protists at comparable rates. Rates of bacterivory were similar in the light and dark. Furthermore, because of their higher abundance, it is the plastidic protists, rather than the aplastidic forms, that control bacterivory in these waters. These findings change our basic understanding of food web function in the open ocean, because plastidic protists should now be considered as the main bacterivores as well as the main CO2 fixers in the oligotrophic gyres.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QR Microbiology | ||||||||
| Divisions: | Faculty of Science > Life Sciences (2010- ) | ||||||||
| Library of Congress Subject Headings (LCSH): | Atlantic Ocean, Marine bacteria, Marine ecology | ||||||||
| Journal or Publication Title: | Proceedings of the National Academy of Sciences | ||||||||
| Publisher: | National Academy of Sciences | ||||||||
| ISSN: | 0027-8424 | ||||||||
| Official Date: | 10 April 2012 | ||||||||
| Dates: |
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| Volume: | Volume 109 | ||||||||
| Number: | Number 15 | ||||||||
| Page Range: | pp. 5756-5760 | ||||||||
| DOI: | 10.1073/pnas.1118179109 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Funder: | Natural Environment Research Council (Great Britain) (NERC), National Oceanography Centre (Great Britain), Plymouth Marine Laboratory (Great Britain) (PML), Seventh Framework Programme (European Commission) (FP7) | ||||||||
| Grant number: | NE/E016138/1 (NERC), NE/G005125/1 (NERC), 265294 (FP7) |
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