Svetlichny, L.S., E.S. Hubareva, F. Erkan & A.C. Gucu. (2000). Physiological and behavioral aspects of Calanus euxinus females (Copepoda: Calanoida) during vertical migration across temperature and oxygen gradients. Marine Biology, Berlin 137(5-6):963-971.
Svetlichny, L.S., E.S. Hubareva, F. Erkan & A.C. Gucu
2000
Physiological and behavioral aspects of Calanus euxinus females (Copepoda: Calanoida) during vertical migration across temperature and oxygen gradients.
Marine Biology, Berlin
137(5-6):963-971.
Publication
Available for editors
In the Black Sea, during summer strati®cation, Calanus euxinus (Hulsemann) undertakes diel vertical migrations with an amplitude of about 117 m from oxygenated, warm (18 °C) surface layers to hypoxic ($0.8 mg O 2 l)1 ) zones with lower temperature (7.9 °C). When such changes in temperature and oxygen concentration are reproduced in the laboratory, total metabolism, basal metabolism and scope of activity of copepods decrease 7.2, 7.8 and 6.7 times, respectively, while the frequency of locomotory acts and mechanical power decline 3.4- and 9.5-fold, respectively. These changes allowed the copepods to conserve a signi®cant portion of food consumed near the surface for transformation to lipid reserves. Diel respiratory oxygen consumption of migrating individuals, calculated so as to include actual duration of residence in layers with di8erent temperature and oxygen concentrations, is estimated at 17.87 lg O 2 ind)1 . The net energy cost of vertical migration made up only 11.6% of the total. Copepods expend 78.6% of diel energy losses during approximately 10 h in the surface layers, while about 5.4% is required during about 9 h at depth. Hypoxia is shown to have a signi®cant metabolic advantage during diel vertical migrations of C. euxinus in the Black Sea.
