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- Title
The ecology of the Calanus ponticus population in the deeper layer of its concentration in the Black Sea.
- Authors
Vinogradov, M.E.; Arashkevich, E.G.; Ilchenko, S.V.
- Abstract
The layer of daytime concentration of (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 concentration in it is >250 ind. m, sometimes being 3500 ind. m 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.; and II, non-feeding and non-migrating specimens of copepodite stage V, their body lipid contents being 100–150 μg ind.. 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, but at such concentration falling into anabiosis. They die at 0.04 ml O 1. Estimates of respiration of the group II specimens (‘winter stock’) show that lipids they store are sufficient for 7 months' survival. Depth of concentration is determined by water density rather than concentration of oxygen.
- Publication
Journal of Plankton Research, 1992, Vol 14, Issue 3, p447
- ISSN
0142-7873
- Publication type
Article