|Effect of oxygen concentration on metabolism and locomotory activity of Moina micrura (Cladocera) cultured under hypo- and normoxia|Svetlichny, L.S.; Hubareva, E.S. (2002). Effect of oxygen concentration on metabolism and locomotory activity of Moina micrura (Cladocera) cultured under hypo- and normoxia. Mar. Biol. (Berl.) 141(1): 145-151. hdl.handle.net/10.1007/s00227-002-0805-x
In: Marine Biology. Springer: Heidelberg; Berlin. ISSN 0025-3162, more
|Authors|| || Top |
- Svetlichny, L.S.
- Hubareva, E.S.
The influence of oxygen concentration on total and basal metabolism, scope of activity, drag force and duration of jerks, time spent swimming and energy cost of locomotion in Moina micrura Hellich females cultured under hypo- and normoxia was investigated. Scope of activity (Q l) of hemoglobin-rich red individuals (Ma) acclimated to hypoxia depended less upon oxygen concentration than that of non-acclimated, pale individuals (Mna). Within the range 10–0.3 mg O2 l–1 Q l decreased 4.4-fold in Ma and 62.5-fold in Mna. In both Ma and Mna the integral drag force of antenna fell from 0.22±0.07 to 0.12±0.04 dyn (1 dyn=1·10–5 N), the duration of jerks increased from 0.06±0.01 to 0.1±0.02 s in the range from ~2.0 mg O2 l–1 to sublethal oxygen concentrations. At 0.7–0.8 mg O2 l–1 Mna stopped filtration and increased time spent swimming. In contrast, even under more severe hypoxia (~0.2 mg O2 l–1), Ma maintained their filtering activity using energy (up to 80% of total metabolism) achieved due to increased oxygen capacity of the blood. Separating locomotion and feeding functions, M. micrura can spend less energy for swimming and use its energy budget more plastically under changing environmental conditions.