Summary
Growth and feeding rates in Stentor coeruleus fed on Tetrahymena are described in relation to prey concentrations ranging from 10:1–50:1 at 15°C and 20°C. Feeding rate was independent of temperature, but governed by prey concentration. Stentor decreased in size where less than 1,000 μJ were consumed in 24 hrs. A maximum level of growth was attained at 15°C, but not at 20°C within the range of prey concentration offered. Energy budgets, constructed using respiratory data published elsewhere (Laybourn, 1975), are presented. Assimilation efficiencies ranged from 74.4–76.4% at 20°C and 65.1–83.2% at 15°C. Gross growth efficiencies were between 70.9–73.6% at 20°C and 63.7–81.6% at 15°C. Net growth efficiencies were very high, 95.6–96.3% at 20°C and 97.5–97.9% at 15°C. The results are explained and discussed in relation to other Protozoa.
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References
Allescher, M.: Über den Einfluß der Gestalt des Kernes auf die Größenabnahme hungernder Infusorien. Arch. Protistenk. 27, 129–171 (1912)
Coleman, G.S.: The metabolism of Escherichia coli and other bacteria by Entodinium caudatum. J. gen. Microbiol. 37, 209–223 (1964)
Curds, C.R., Cockburn, A.: Studies on the growth and feeding of Tetrahymena pyriformis in axenic and monoxenic culture. J. gen. Microbiol. 54, 343–358 (1968)
Heal, O.W.: Quantitative studies on soil amoebae. Progress in soil biology, O. Graff, J.E. Satchell, eds., p. 120–126. Amsterdam 1967a
Heal, O.W.: Methods in the study of soil Protozoa. Proceedings of the Symposium on Methods of Study of Soil Ecology, J. Phillipson, ed., p. 119–126. Paris: U.N.E.S.C.O. 1967b
Laybourn, J.: Respiratory energy losses in Stentor coeruleus Ehrenberg (Ciliophora). Oecologia (Berl.) 21, 273–278 (1975)
Laybourn, J.E.M., Stewart, J.M.: Studies on consumption and growth in the ciliate Colpidium campylum Stokes. J. anim. Ecol. 44, 165–174 (1975)
Peters, R.A.: The substances needed for the growth of a pure culture of Colpidium colpoda. J. Physiol. (Lond.) 55, 1–31 (1921)
Proper, G., Garver, J.C.: Mass culture of the Protozoa Colpoda steinii. Biotechnol. Bioeng. 8, 287–296 (1966)
Sarojini, R., Nagabhushanam, R.: A comparative study of the respiration of some free-living ciliated Protozoa. J. anim. Morph. Physiol. 14, 1, 158–167 (1967)
Schaeffer, A.A.: Selection of food in Stentor coeruleus (Ehr.). J. exp. Zool. 8, 75–132 (1910)
Tartar, V.: The biology of Stentor. London: Pergamon Press 1961
Weisz, P.B.: A cytochemical and cytological study of differentiation in normal and reorganising stages of Stentor coeruleus J. Morph. 84, 335–363 (1949)
Winberg, G.G. (ed.): Symbols, units and conversion factors in studies in freshwater productivity. I.B.P. Section P.F. (1971)
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Laybourn, J. Energy budgets for Stentor coeruleus Ehrenberg (Ciliophora). Oecologia 22, 431–437 (1976). https://doi.org/10.1007/BF00345319
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DOI: https://doi.org/10.1007/BF00345319