New Zealand Journal of Marine and Freshwater Research abstracts
Grazing by protozoa in marine coastal and
oceanic ecosystems off New Zealand
MARK R. JAMES
National Institute of Water & Atmospheric
Research Ltd
P. O. Box 8602, Riccarton
Christchurch, New Zealand
JULIE A. HALL
National Institute of Water & Atmospheric
Research Ltd
P. O. Box 11-115
Hamilton, New Zealand
D. PAUL BARRETT
Department of Ecology
Massey University
Private Bag 11222
Palmerston North, New Zealand
Abstract Uptake rates for ciliates and flagellates grazing on
bacteria and picophytoplankton were measured in different water masses around
South Island, New Zealand, in April 1992. Fluorescent particles were used to
established uptake rates for major ciliate taxa, phytoflagellates, and
heterotrophic flagellates. Protozoan grazing had little impact on the bacterial
population, removing < 5% of the population per day. Heterotrophic
flagellates and ciliates selected picophytoplankton in preference to
bacterial-sized particles, both groups removing 6-32% of the picophytoplankton
population per day. Highest removal rates for picophytoplankton were found in
coastal waters and for bacterial populations in subantarctic waters. This
difference was attributed to differences in community composition and
taxa-specific clearance rates.
Keywords Grazing; ciliates; flagellates; bacteria;
picoplankton
New Zealand Journal of Marine and Freshwater Research, 1996, Vol 30:
313-324
0228-8330/96/3003-0313 $2.50/0 (c) The Royal Society of New Zealand
1996
PDF file of entire paper: medium quality (899K); (scanned from paper original: notes about this process)
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