Taxon-specific analysis of microzooplankton grazing rates and phytoplankton growth rates

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Waterhouse, T. Y., & Welschmeyer, N. A. (1995). Taxon-specific analysis of microzooplankton grazing rates and phytoplankton growth rates. Limnology and Oceanography, 40(4), 827-834.
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TitleTaxon-specific analysis of microzooplankton grazing rates and phytoplankton growth rates
AuthorsT. Waterhouse, N. Welschmeyer
AbstractWe performed laboratory experiments to test the accuracy of using HPLC to estimate taxon-specific grazing and growth rates obtained by the dilution technique. In seven of nine experiments, this technique underesti- mated microzooplankton grazing rates. The average estimated grazing rates were 52% of the true grazing rates for chlorophyll a and 33% for taxon-specific pigments. With the food sources Phaeodactylum tricornutum, Isochrysis galbana, Gymnodinium sp., and Emiliania huxleyi, the clearance rates for Oxyrrhis marina were between 2 x 10-3 and 7 x 10-3 ml grazer- 1 d- 1, at initial food concentrations of ~ 5 x 103 cells ml- 1. At higher food concentrations (1 x 105 cells ml-1) clearance rates decreased to 1 X 10-4 ml graz- er- 1 d- 1. In field experiments performed in September 1991 and March 1992 in Monterey Bay, California, 21-55% of the phytoplankton standing stock was consumed daily by microzooplankton grazing. The underestimation of grazing rates in the laboratory experiments implies that rates obtained in field incubations may be in error.
JournalLimnology and Oceanography
Date1995
Volume40
Issue4
Start page827
End page834
ISSN0024-3590
Subjectsfood webs, grazing, plankton, USA, California, Monterey Bay
NoteCited By (since 1996):34, Oceanography, CODEN: LIOCA, Downloaded from: aslo.org/lo/toc/vol_40/issue_4/0827.pdf (16 June 2014).

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