RESUMO

The effects of short-term hypoxia on the respiration intensity (polarography), ammonia nitrogen excretion, and atomic N:O ratio were studied in active and narcotized Moina micrura cultivated under hypoxia (~ 1.4 mg O₂·L⁻¹) and normoxia. It has been shown that oxygen dependence of their total metabolism is diminished at acclimation to hypoxia. The basal metabolism, as well as excretion of ammonia nitrogen, is changed proportionally to the O₂ concentration independently of the acclimation degree to hypoxia. It is concluded that transition of Moina micrura from the routine for normoxia protein-lipid type of catabolism to pure protein utilization occurs only at sublethal oxygen concentrations.