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Appl Environ Microbiol. 1986 December; 52(6): 1340-1347
Copyright © 1986, American Society for Microbiology. All Rights Reserved.

Effect of Temperature on Growth, Respiration, and Nutrient Regeneration by an Omnivorous Microflagellate {dagger}

David A. Caron*, Joel C. Goldman and Mark R. Dennett

Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543

ABSTRACT

The effect of temperature on the rates and extent of carbon and nitrogen cycling by the heterotrophic microflagellate Paraphysomonas imperforata (diameter, 7 to 12 µm) fed with the diatom Phaeodactylum tricornutum was investigated over an ecologically pertinent temperature range (14 to 26°C). All physiological rates investigated increased with increasing temperature. Q10 values were similar for all rate changes and were comparable to those which have been reported for other protozoa. In contrast to all rates, microflagellate gross growth efficiency and cell volume were unaffected by temperature. Decreases in the concentrations of particulate carbon and particulate nitrogen from grazed diatom cultures also were similar when summed over the entire growth phase of the microflagellate population. Therefore, the proportions of ingested carbon and nitrogen which were incorporated or remineralized by the microflagellate were independent of temperature between 14 and 26°C. At temperatures above 18°C, growth rates of P. imperforata were greater than the maximum growth rates reported for most phytoplankton. We conclude that the impact of P. imperforata on natural phytoplankton communities is not controlled by temperature above 18°C but may be affected by the rate at which zooplankton or microzooplankton prey on the microflagellate, as well as the inability of the microflagellate to graze efficiently when phytoplankton are present at low cell densities.

FOOTNOTES

* Corresponding author.

{dagger} Contribution 6320 of the Woods Hole Oceanographic Institute.

Appl Environ Microbiol. 1986 December; 52(6): 1340-1347
Copyright © 1986, American Society for Microbiology. All Rights Reserved.



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Copyright © 1986 by the American Society for Microbiology. All rights reserved.