Abstract
Weight-specific rates of individual production, total metabolic expenditure and assimilation, and net production efficiencies were estimated forCalanus pacificus Brodsky of selected body weights cultured at various phytoplankton concentrations and temperatures. The weight-specific rate of individual production increased hyperbolically with food concentration, and the maximum rate of individual production decreased logarithmically with a linear increase in body weight propotionally more at high than at low temperature. The weight-specific rate of total metabolic expenditure decreased logarithmically with increasing body weight and was unaffected by changes in food concentration. The effects of food concentration and temperature on the weight-specific rate of assimilation were similar to those on the rate of individual production, but the effect of body size differed considerably. The diversity in the temperature and body-size dependence of the maximum weight-specific rates of various physiological processes suggest (1) that, except for the metabolic rate, the allometric model (log-log relation) is inadequate for describing relationships between maximum rates of physiological processes and body size within species, and (2) that the common assumption that temperature affects the rates of various physiological processes in similar ways is not justified. Net production efficiency increased hyperbolically with food concentration, and the maximum production efficiency first increased slightly and then decreased gradually with increasing body weight. Small copepods attained higher efficiency at high temperature but larger ones did so at low temperature. The critical food concentrations for production efficiency and for the rate of individual production increased with increasing temperature and body size. Because of the effects of interactions among critical food concentration, temperature, and body size on the rates of growth and individual production and on net production efficiency, early development stages ofC. pacificus optimized growth and food conversion efficiency at high temperature, but late stages, particularly at low food concentrations, grew best and transformed food more efficiently at low temperature.
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Communicated by I. Morris, West Boothbay Harbor
Contribution No. 1130 From the Department of Oceanography, University of Washington, Seattle, Washington 98195, USA
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Vidal, J. Physioecology of zooplankton. IV. Effects of phytoplankton concentration, temperature, and body size on the net production efficiency ofCalanus pacificus . Mar. Biol. 56, 203–211 (1980). https://doi.org/10.1007/BF00645344
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DOI: https://doi.org/10.1007/BF00645344