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Mixotrophic basis of Atlantic oligotrophic ecosystems

Hartmann, M.; Grob, C.; Tarran, G.A.; Martin, A.P.; Burkill, P.H.; Scanlan, D.J.; Zubkov, M.V.. 2012 Mixotrophic basis of Atlantic oligotrophic ecosystems. Proceedings of the National Academy of Sciences, 109 (15). 5756-5760. 10.1073/pnas.1118179109

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Abstract/Summary

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: Publication - Article
Digital Object Identifier (DOI): 10.1073/pnas.1118179109
Programmes: NOC Programmes
ISSN: 00278424
Additional Keywords: phytoplankton predation, phototrophic eukaryotes, primary producers, microbial grazers, pulse–chase labeling
Date made live: 19 Apr 2012 08:45 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/437186

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