Journal of Siberian Federal University. Biology / Looking Backward to the Problem of the Deep-Sea Caspian Fauna

Full text (.pdf)
Issue
Journal of Siberian Federal University. Biology. 2010 3 (3)
Authors
Karpinsky, Mikhail G.
Contact information
Karpinsky, Mikhail G. : Russian Federal Research Institute of Fisheries and Oceanography , 17 V. Krasnoselskaya st., Moscow, 107140 Russia , e-mail:
Keywords
Caspian; benthos; vertical distribution; deep-sea fauna; sturgeon's grazing pressure
Abstract

The causes of strong decrease of biomass, number and species diversity of the benthos at the depth 60-100 m and absent of specific deep-sea fauna in Caspian are represented below. The reason of this phenomenon is complex of factors: unstable oxygen conditions in deep-sea valleys, worse trophic conditions than on shelf and formation of bottom fauna under strong grazing pressure of sturgeons. Due to constant grazing pressure there is always place for the juveniles that decrease or even eliminate intraspecific competition for the place. In conditions of weak competition species have no cause to colonize new place that stopped formation of deep-sea species.

Pages
322-334
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/2244

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