Description of the biogeochemical features of the subtropical southeastern Atlantic and the Southern Ocean south of South Africa during the austral summer of the International Polar Year

Le Moigne, F.A.C.; Boye, M.; Masson, A.; Corvaisier, R.; Grossteffan, E.; Guéneugues, A.; Pondaven, P.. 2013 Description of the biogeochemical features of the subtropical southeastern Atlantic and the Southern Ocean south of South Africa during the austral summer of the International Polar Year. Biogeosciences, 10 (1). 281-295. 10.5194/bg-10-281-2013

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Abstract/Summary

To examine the potentially competing influences of microzooplankton and calcite mineral ballast on organic matter remineralization, we incubated diatoms in darkness in rolling tanks with and without added calcite minerals (coccoliths) and microzooplankton (rotifers). Concentrations of particulate organic matter (POM in suspension or in aggregates), of dissolved organic matter (DOM), and of dissolved inorganic nutrients were monitored over 8 days. The presence of rotifers enhanced the remineralization of ammonium and phosphate, but not dissolved silicon, from the biogenic particulate matter, up to 40% of which became incorporated into aggregates early in the experiment. Added calcite resulted in rates of excretion of ammonium and phosphate by rotifers that were depressed by 67% and 36%, respectively, demonstrating the potential for minerals to inhibit the destruction of POM by zooplankton in the water column. Lastly, the presence of the rotifers and added calcite minerals resulted in a more rapid initial rate of aggregation, although not a greater overall amount of aggregation during the experiment.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.5194/bg-10-281-2013
ISSN:	1726-4189
Date made live:	11 Mar 2014 10:20 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/505636

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