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Article

Temperature Dependence of Freshwater Phytoplankton Growth Rates and Zooplankton Grazing Rates

Department of Environmental Sciences, College of the Coast and Environment, Louisiana State University, Baton Rouge, LA 70803, USA
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Author to whom correspondence should be addressed.
Academic Editor: Jun Yang
Received: 22 May 2021 / Revised: 2 June 2021 / Accepted: 2 June 2021 / Published: 4 June 2021
(This article belongs to the Special Issue Algae: Indices of Water and Ecological Quality)
Phytoplankton growth rates and zooplankton grazing rates were estimated on 16 occasions over a period of 17 months in University Lake, a highly eutrophic lake on the campus of Louisiana State University. Phytoplankton growth rates and chlorophyll a concentrations averaged 1.0 ± 0.2 d−1 and 240 ± 120 mg m−3, respectively. Chlorophyll a concentrations were at or above the inflection point of the Holling type I curve that described the relationship between zooplankton grazing rates and chlorophyll a concentrations. In most cases, it was necessary to dilute lake water by more than a factor of 4 before zooplankton grazing rates became sensitive to chlorophyll a concentrations. Chlorophyll a concentrations were positively correlated with temperature and were roughly fourfold higher at 30 °C than at 15 °C. An analysis of the temperature dependence of the growth rates and grazing rates in this study and 87 other paired estimates of limnetic phytoplankton growth rates and zooplankton grazing rates revealed virtually identical temperature dependences of growth rates and grazing rates that were very similar to the temperature dependence predicted by the metabolic theory of ecology. Phytoplankton growth rates exceeded zooplankton grazing rates by 0.13 ± 0.05 d−1 at all temperatures over a temperature range of 8.5–31.5 °C. The Q10 for both phytoplankton growth rates and zooplankton grazing rates was 1.5 over that temperature range. View Full-Text
Keywords: dilution method; Q10; grazing; metabolic theory of ecology; models dilution method; Q10; grazing; metabolic theory of ecology; models
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MDPI and ACS Style

Pulsifer, J.; Laws, E. Temperature Dependence of Freshwater Phytoplankton Growth Rates and Zooplankton Grazing Rates. Water 2021, 13, 1591. https://0-doi-org.brum.beds.ac.uk/10.3390/w13111591

AMA Style

Pulsifer J, Laws E. Temperature Dependence of Freshwater Phytoplankton Growth Rates and Zooplankton Grazing Rates. Water. 2021; 13(11):1591. https://0-doi-org.brum.beds.ac.uk/10.3390/w13111591

Chicago/Turabian Style

Pulsifer, Jennifer, and Edward Laws. 2021. "Temperature Dependence of Freshwater Phytoplankton Growth Rates and Zooplankton Grazing Rates" Water 13, no. 11: 1591. https://0-doi-org.brum.beds.ac.uk/10.3390/w13111591

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