By Henri J. Dumont, Tamara A. Shiganova, Ulrich Niermann
The Mediterranean, Black, and Caspian Seas, the rivers and canals that attach them, and the large quantity of delivery within the area, characterize a conduit for aquatic invasion, whose results are just now commencing to be understood. This booklet presents an updated assessment of jelly invasions within the Ponto-Caspian that have affected neighborhood ecosystems because the early Nineteen Eighties, contrasting that with different organic invasions, looking for underlying principles.
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Extra info for Aquatic Invasions in the Black, Caspian, and Mediterranean Seas
It seems that a combination of factors triggered them. Anthropogenic activities like pollution and eutrophication, overﬁshing and the accidental introduction of M. leidyi in the beginning of the 1980s may have paved the way for the changes in the Black Sea ecosystem. M. leidyi lived for about ﬁve years in the Black Sea without notable effects, until it burst out in the years 1988-1990. It is possible that the regime shift, of which effects on hydrology and organisms were documented for the North Atlantic and North Paciﬁc region, affected the ecosystem of the Black Sea as well.
There were 54 algal species in all, among which 17 diatoms, 34 dinoﬂagellates, Dinophyceae and Chrysophyceae. Chlorophyta, Cyanophyceae and Cryptophyceae had one species each. Diatoms contributed the highest individual numbers. They made up 40% of total abundance and 90% of total biomass. Small Flagellata comprised up to 60% of abundance and 90% of biomass of nanoplankton. 6%. Diatoms were represented by Nitzschia and Pseudonitzschia (four species), Dinoﬂagellata as by Protoperidinium (six species) and Gymnodinium (ﬁve species).
M. Napp, R. D. Brodeur, A. I. Pinchuk & G. R. , 2001. Anomalous conditions in the SE Bering Sea, 1997: nutrients, phytoplankton, and zooplankton. Fisheries and Oceanography 10: 99-116. Tkach, A. , A. D Gordina, U. Niermann, A. E. Kideys & V. E. Zaika, 1998. Changes in feeding parameters of ﬁsh larvae in the Black Sea during last decade comparing 1950-1960s. In L. I. Ivanov & T. 1; Kluwer Academic Publishers: 235-248. Tsikhon-Lukanina, Y. A. & O. G. Reznitchenko, 1991. Diet of the ctenophore Mnemiopsis in the Black Sea as a function of size.