Persistence of phytoplankton responses to different Si:N ratios under mesozooplankton grazing pressure: a mesocosm study with Northeast Atlantic plankton.

Sommer, Ulrich, Hansen, Thomas, Stibor, H. and Vadstein, O. (2004) Persistence of phytoplankton responses to different Si:N ratios under mesozooplankton grazing pressure: a mesocosm study with Northeast Atlantic plankton. Open Access Marine Ecology Progress Series, 278 . pp. 67-75. DOI 10.3354/meps278067.

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Abstract

We fertilised 12 mesocosms with NE Atlantic phytoplankton with different Si:N ratios (0:1 to 1:1). After 1 wk, we added mesozooplankton, mainly calanoid copepods at natural densities to 10 of the mesocosms; the remaining 2 mesocosms served as controls. A trend of increasing diatom dominance with increasing Si:N ratios and species-specific correlations of diatoms to Si:N ratios were not changed by the addition of mesozooplankton. Large unicellular and chain-forming diatoms, thin-walled dinoflagellates (Gymnodiniales) and ciliates were reduced by copepod grazing while armoured dinoflagellates remained unaffected. Nanoplanktonic flagellates and diatoms profited from the addition of copepods, probably through release from ciliate grazing.

Document Type: Article
Keywords: Marine Biology; Phytoplankton; Zooplankton; Nutrient ratios; Mesocosms
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.3354/meps278067
ISSN: 0171-8630
Date Deposited: 11 Feb 2010 08:14
Last Modified: 30 May 2018 12:42
URI: http://oceanrep.geomar.de/id/eprint/644

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