Grazing Constants are Not Constant: Microzooplankton Grazing is a Function of Phytoplankton Production in an Australian Lagoon

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• 作者：Brian G. Sanderson (1) bxs@eastlink.ca
  Anna M. Redden (2) anna.redden@acadiau.ca
  Kylie Evans (3) kylie.evans@charlton.nsw.edu.au
• 关键词：Grazing rate &#8211 ; Saturated grazing &#8211 ; Microzooplankton &#8211 ; Growth rate &#8211 ; Phytoplankton &#8211 ; Plankton model &#8211 ; NPZ model &#8211 ; Invariants
• 刊名：Estuaries and Coasts
• 出版年：2012
• 出版时间：September 2012
• 年：2012
• 卷：35
• 期：5
• 页码：1270-1284
• 全文大小：878.1 KB
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• 作者单位：1. Department of Environment and Climate Change, PO Box A290, Sydney, South NSW 1232, Australia2. Acadia Centre for Estuarine Research, Acadia University, PO Box 115, Wolfville, NS B4P 2R6, Canada3. University of Newcastle, Central Coast Campus, PO Box 127, Ourimbah, NSW 2258, Australia4. 15 Beckwith St, Wolfville, NS, Canada B4P 1R35. Charlton Christian College, PO Box 605, Toronto, NSW 2283, Australia
• ISSN：1559-2731

文摘

Twenty-one dilution method experiments were used to measure phytoplankton growth rate, grazing rate by microzooplankton, and phytoplankton concentrations that saturate grazing in Tuggerah Lake—a large lagoon in New South Wales, Australia. Individual experiments conformed to the saturating grazing model with no evidence of a threshold phytoplankton concentration to initiate grazing. Phytoplankton concentrations that saturated grazing were highly variable between experiments and were positively correlated with chlorophyll a concentration in the lagoon. Plankton models often use a saturating grazing function that includes several constants, but constants are found to be variable from one dilution experiment to the next. Another formulation is proposed in which grazing is a quadratic function of phytoplankton growth. This enables the 21 measurements of zooplankton grazing to be fitted using only two invariant parameters. No evidence is found for saturation of microzooplankton grazing when it is calculated as a function of phytoplankton growth. When phytoplankton growth is high, about 80% of it is grazed. When phytoplankton growth is low, about 45% is grazed. Calculations illustrate that this type of grazing stabilizes the planktonic producers and grazers, as expected.