โ Scribed by P. Mayzaud
No coin nor oath required. For personal study only.
Respiration and nitrogen-excretion studies were carried out on several species of zooplankton (Meganyctiphanes norvegica, Phronirna sedentaria, Acartia clausi and Sagitta setosa) under starvation. Although all the species were mainly ammonotelie, apparently a significant amount of organic nitrogen was excreted; the validity of the raeasurements and their significance are discussed. The effect of duration of starvation showed for M. norvegica and A. clausi two different patterns of behaviour, which were chiefly a function of the rate of biomass turnover of the species studied. The rates of metabolism, chemical composition, and reaction to starvation varied with season in _M. norvegica. The physiological balance of the experimen~M animals was examined by eMculating the protein carbon equivalent to respiratory and excretory catabolism, and by use of atomic 0 :N ratios. Starved individuals catabolized more protein carbon than can be accounted for by the amount of respiratory oxygen utilized. A hypothesis, which suggests that there are tba'ee levels of resistance to starvation, is proposed to explain this paradox, and its metabolic basis is discussed.
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