Longterm changes in the biomass and composition of fodder zooplankton in coastal regions of the Black Sea during the period 1957-1996.

Date

1998-01-01

Author

Kovalev, AV
Gubanova, AD
Kıdeyş, Ahmet Erkan
Melnikov, VV
Niermann, U
Ostrovskaya, NA
Prusova, IY
Skryabin, VA
Uysal, Zahit
Zagorodnyaya, JA

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Results of long-term research carried out on the of fodder zooplankton (mesozooplankton excluding jelly organisms) in coastal regions and shelf areas of the Black Sea (Sevastopol area, northwestern shelf, Turkish shelf) are compared. In all regions similar changes in the composition of this economically important group of zooplankton were obvious. During the period under investigation the total biomass of the fodder zooplankton has decreased and some species have disappeared (Oithona nana and other species of genus Pontellidae). In terms of biomass Acartia clausi became the most dominant copepod during the last 2 decades. The most significant changes have taken place in coastal zones with maximum depths of about 40-50 m, and in bays, especially in regions influenced by river run-offs, near to ports and industrial regions. The changes in the abundance of fodder zooplankton coincide with the increase of the biomass of gelatinous predators. The strengthening of anthropogenic impact on the ecosystem of the Black Sea is, besides natural fluctuation, obviously the main reason of the changes in the coastal regions.

URI

https://hdl.handle.net/11511/116853

Collections

Graduate School of Marine Sciences, Conference / Seminar