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Hydrobiological Journal

ISSN Print: 0018-8166
ISSN Online: 1943-5991

Hydrobiological Journal

DOI: 10.1615/HydrobJ.v40.i3.100
9 pages

Peculiarities of Metabolic Response of Moina micrura (Cladocera) Grown at Hypo- and Normoxia on Changed Oxygen Concentrations

L. S. Svetlichniy
Institute of Biology of the Southern Seas National Academy of Sciences of Ukraine Sevastopol, Ukraine
Ye. S. Gubareva
Institute of Biology of the Southern Seas National Academy of Sciences of Ukraine Sevastopol, Ukraine

ABSTRACT

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.