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The grazing impact of microzooplankton off south west Western Australia: as measured by the dilution technique
Citation
Paterson, H and Knott, B and Koslow, AJ and Waite, AM, The grazing impact of microzooplankton off south west Western Australia: as measured by the dilution technique, Journal of Plankton Research, 30, (4) pp. 379-392. ISSN 0142-7873 (2008) [Refereed Article]
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The definitive publisher-authenticated version is available online at: www.oxfordjournals.org
Official URL: http://www.oxfordjournals.org
DOI: doi:10.1093/plankt/fbn004
Abstract
Grazing rates of microzooplankton feeding on picophytoplankton (Flow-cytometry) and total
phytoplankton (Chlorophyll a) were measured in the eastern Indian Ocean off south west Western
Australia from February 2003 to December 2004. Three sites representing different oceanographic
habitats, the coastal lagoon, the outer shelf and the continental slope (1000 m) were sampled.
The dilution method of Landry and Hassett (1982, Estimating the grazing impact of marine
micro-zooplankton. Mar. Biol., 67, 283288) was used and analysed by chlorophyll a analysis
and flow-cytometry. During summer, the apparent growth rate of total phytoplankton exceeded loss
due to microzooplankton grazing in the lagoon and at the outer shelf. On the slope, the phytoplankton
assemblage was always dominated by small cells (<5 μm). Although their apparent growth
rates were also higher in summer, these were matched by increasing microzooplankton grazing rates.
Saturated feeding responses at the outer shelf and slope stations during summer were detected.
In this low prey, low productivity environment, this response is either a new type of threshold
feeding or an artefact of the dilution method which would result in an over-estimate of both phytoplankton
growth and microzooplankton grazing.
Item Details
Item Type: | Refereed Article |
---|---|
Research Division: | Biological Sciences |
Research Group: | Ecology |
Research Field: | Marine and estuarine ecology (incl. marine ichthyology) |
Objective Division: | Environmental Management |
Objective Group: | Marine systems and management |
Objective Field: | Marine biodiversity |
UTAS Author: | Paterson, H (Dr Harriet Paterson) |
ID Code: | 59517 |
Year Published: | 2008 |
Web of Science® Times Cited: | 15 |
Deposited By: | Research Division |
Deposited On: | 2009-12-04 |
Last Modified: | 2012-10-23 |
Downloads: | 0 |
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