title: Respiratory energy losses in the protozoan predator Didinium nasutum Müller (Ciliophora).
abstract: Respiration in Didinium nasutum, an active protozoan predator, was investigated in relation to cell weight at 10, 15, and 20° C by means of cartesian diver microrespirometry. Oxygen uptake increased progressively over the 10-20° C temperature range; a table of Q10related to weight is presented. Regression coefficients of log weight versus log oxygen uptake (b) were 0.96 at 10° C, 0.98 at 15° C and 1.00 at 20° C. D. nasutum was shown to expend very much higher levels of respiratory energy than a mainly sedentary carnivorous ciliate of comparable weight.
authors.affiliation: Department of Biology, University of Stirling, Stirling, United Kingdom.
authors.forename: Johanna
authors.initials: J
authors.lastname: Laybourn