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JOURNAL OF PLANKTON RESEARCH | VOLUME 14 | NUMBER 3 | PAGES 447-458 | 1992
© Oxford University Press

research-article

The ecology of the Calanus ponticus population in the deeper layer of its concentration in the Black Sea

M.E. Vinogradov, E.G. Arashkevich and S.V. Ilchenko1

Institute of Oceanology Academy of Sciences USSR Moscow 1Institute of Oceanology Academy of Sciences USSR Southern Branch, Gelenjik

Received on October 19, 1990; accepted on August 28, 1991 The layer of daytime concentration of Calanus ponticus (VC and VI C) performing daily vertical migrations and the layer of ‘winter stock’ aggregation are confined to the depth of maximal gradient of the main pycnocline under an unusually sharp oxycline. The concentration layer thickness ranges from 2 to 20–30 m and the Calanus concentration in it is >250 ind. m–3, sometimes being 3500 ind. m–3 and even more. The population in the concentration layer is divided into two ecological groups: I, feeding and migrating specimens of copepodite stages V and VI, their body lipid contents being 25–60 µg min.–1; and II, non-feeding and non-migrating specimens of copepodite stage V, their body lipid contents being 100–150 µg ind.–1. The relationship with oxygen concentration was studied in both ecogroups. The experiments show that specimens of ecogroup II can exit at an oxygen concentration of 0.06 ml 1–1, but at such concentration falling into anabiosis. They die at 0.04 ml O2 1–1. Estimates of respiration of the group II specimens (‘winter stock’) show that lipids they store are sufficient for 7 months' survival. Depth of Calanus concentration is determined by water density rather than concentration of oxygen.


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