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Zooplankton grazing in the Atlantic Ocean: A latitudinal study

Calbet, Albert, Atienza, Dacha, Henriksen, Casper I., Saiz, Enric and Adey, Timothy R. (2009) Zooplankton grazing in the Atlantic Ocean: A latitudinal study Deep Sea Research Part II: Topical Studies in Oceanography, 56, (15), pp. 954-963. (doi:10.1016/j.dsr2.2008.10.009).

Record type: Article

Abstract

Mesozooplankton and 63–200 ?m net-collected microzooplankton grazing on phytoplankton and protozoans was evaluated by 24-h incubations on a latitudinal transect in the Atlantic Ocean, from 35°N to 38°S (AMT-15; September–October 2004). The sampling area comprised contrasting ecosystems, including upwelling zones and oligotrophic subtropical gyres. Grazing impacts of mesozooplankton and 63–200 ?m microzooplankton on total chlorophyll a (Chl a), >5 ?m Chl a, ciliates, and dinoflagellates were low for both zooplankton size fractions, always removing<1.5% of the standing stocks of these groups. Grazing had a slightly greater impact upon primary production (up to 10% of primary production consumed daily), although on most occasions grazing removed<1% of primary production per day. To account for the reduction of micrograzers by predators in the experimental bottles and the consequent reduction of grazing pressure, the data were corrected with knowledge on the decrease of microzooplankton during incubations and global estimates of microzooplankton grazing. The corrected grazing rates for mesozooplankton ranged from 4% to 28% of the primary production consumed daily, and from 1% to 2% of the standing stock of Chl a removed every day. The 63–200 ?m microzooplankton corrected grazing impact was always<5% of the primary production and standing stock consumed per day. The corrected grazing activity of 63–200 ?m microzooplankton and mesozooplankton rendered daily rations ranging from 3% to 38% of the body carbon consumed daily, not sufficient for basal metabolism in most of the areas studied. Finally, the data on mesozooplankton grazing on primary production confirm the recent hypothesis of a decline of the relative importance of mesozooplankton grazing on primary producers with increasing primary production [Calbet, A., 2001. Mesozooplankton grazing effect on primary production: a global comparative analysis in marine ecosystems. Limnology and Oceanography 46, 1824–1830].

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More information

Published date: 1 July 2009
Keywords: Microzooplankton, Phytoplankton, Ciliates, Dinoflagellates, Grazing, Impact

Identifiers

Local EPrints ID: 66837
URI: http://eprints.soton.ac.uk/id/eprint/66837
ISSN: 0967-0645
PURE UUID: 907b56bc-c9eb-414d-ac9a-076ac442bf1e

Catalogue record

Date deposited: 24 Jul 2009
Last modified: 19 Jul 2017 00:21

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Contributors

Author: Albert Calbet
Author: Dacha Atienza
Author: Casper I. Henriksen
Author: Enric Saiz
Author: Timothy R. Adey

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