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Respiration Rates in Heterotrophic, Free-living Protozoa

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Journal Microb Ecol
Date 2013 Nov 14
PMID 24221648
Citations 30
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Abstract

Published estimates of protozoan respiratory rates are reviewed with the object of clarifying their value in ecological studies. The data show a surprisingly large variance when similarly sized cells or individual species are compared. This is attributed to the range of physiological states in the cells concerned. The concept of basal metabolism has little meaning in protozoa. During balanced growth, energy metabolism is nearly linearly proportional to the growth rate constant; at the initiation of starvation, metabolic rate rapidly declines. Motility requires an insignificant fraction of the energy budget of protozoans. For growing cells, metabolic rate is approximately proportional to weight(0.75) and the data fall nearly exactly on a curve extrapolated from that describing the respiration rates of poikilotherm metazoans as a function of body weight. It is conceivable that protozoan species exist with lower maximum potential growth and metabolic rates than those predicted from cell volume and the equations derived from the available data. However, the lack of information concerning the state of the cells studied prevents verification of this idea. Laboratory measurements of protozoan respiratory rates have no predictive value for protozoa in nature other than delimiting a potential range. For small protozoans, this range may, on an individual basis, represent a factor of 50.

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References
1.
PACE D, McCASHLAND B . Effects of low concentration of cyanide on growth and respiration in Pelomyxa carolinensis-Wilson. Proc Soc Exp Biol Med. 1951; 76(1):165-8. DOI: 10.3181/00379727-76-18424. View

2.
Van de Vijver G . Studies on the metabolism of Tetrahymena pyriformis GL. I. Influence of substrates on the respiratory rate. Enzymologia. 1966; 31(6):363-81. View

3.
Howland R, Bernstein A . A METHOD FOR DETERMINING THE OXYGEN CONSUMPTION OF A SINGLE CELL. J Gen Physiol. 2009; 14(3):339-48. PMC: 2141112. DOI: 10.1085/jgp.14.3.339. View

4.
Laybourn J . Respiratory energy losses in the protozoan predator Didinium nasutum Müller (Ciliophora). Oecologia. 2017; 27(4):305-309. DOI: 10.1007/BF00345563. View

5.
Taylor W . Growth responses of ciliate protozoa to the abundance of their bacterial prey. Microb Ecol. 2013; 4(3):207-14. DOI: 10.1007/BF02015077. View