期刊名称：Journal of FisheriesSciences.com / Su ÜrünleriBilimeri.com
印刷版ISSN：1307-234X
出版年度：2007
卷号：1
期号：4
页码：191-227
出版社：Istanbul University
摘要：As a result of eutrophication caused by increased nutrient input via major northwestern rivers
during the last few decades, the Black Sea ecosystem has been subject to extreme changes in
recent years. Abnormal changes due to altered nutrient balance were reflected in the qualitative
and quantitative composition of phytoplankton and zooplankton. The increase observed in the
quantity of plankton was probably responsible for the rise of Turkish anchovy catches observed
over the last few decades. However since 1988, the Black Sea has been invaded by a
voracious zooplankton predator, the ctenophore Mnemiopsis leidyi which was accidentally introduced
into this sea from the northwest Atlantic. This mass occurrence of Mnemiopsis appears
to be one of the most important reasons for the sharp decrease of anchovy and other pelagic
fish stocks in the Black Sea. By October 1997, new ctenophore Beroe ovata has appeared
in shallow waters of the Black. Species of genus Beroe almost exclusively feed on other
ctenophores and feeding interaction within ctenophores form an ecological feed-back system
which also affects other compartments of the planktonic community.
关键词：Anchovy, Black Sea, Ecosystem, Eutrophication, Mnemiopsis, Beroe
