Energy Metabolism in Postlarval Ontogenesis of Planorbarius corneus (Planorbidae, Gastropoda)

摘要

The change in the rate and mass-specific rate of oxygen consumption was studied during individual ontogenesis of nine Planorbarius corneus individuals starting from 3 weeks after hatching until the death of animals. It is shown that, at the initial stages of development, the mass-specific rate of oxygen consumption increases, reaching a maximum at 3-7 weeks after hatching. The rate of oxygen consumption then permanently increases, and the mass-specific rate of oxygen consumption permanently decreases. The dependences of mass-specific rate of oxygen consumption (q) on the age (t) for individual P. corneus can be described by the equation q(st)/(1 - exp(-k (t + t(0)))). The values of the coefficients of this equation for different specimens do not differ significantly and are, on average, k = 0.134 +/- 0.016 weeks(-1); q(st) = 0.117 +/- 0.006 mL O-2/(h g). The dependence of the rate of oxygen consumption (Q, mL O-2/h) on body weight (M, g) in individual development is well described by allometric equations, the power coefficients of which vary from 0.647 to 0.944 and significantly differ from each other (p < 0.001). Nevertheless, the data for all mollusks can be described by the united equation Q = 0.061 M-0.795. The power coefficient of this equation does not significantly differ from the Hemmingsen constant 0.75.