Güneydoğu Karadeniz’de Yaz Dönemi Mikrozooplankton Dinamiği

Guneydogu Karadeniz’de Mikrozooplankton komunite komposzisyonu, bollugu ve iliskili oldugu dusunulen cevresel parametreler nehir agzi ve acik istasyonunda Haziran 2015-Agustos 2015 tarihleri arasinda arastirildi. Mikrozooplankton komunitesi protozoa ve mikrometazoadan olustu. Ancak protozoa mikrozooplanktonun baskin grubu oldu. Her iki ornekleme istasyonunda da protozoa komunitesi heterotrofik dinoflagellatlar ve siliyatlar tarafindan temsil edildi. Bu calismada sarkodinlere rastlanmadi. Mikrozooplankton bollugu nehir agzinda 332- 845 hucre/l ve acik istasyonunda 203- 604 hucre/l arasinda degisti ve Haziran’dan Agustos’a dusus egilimi sergiledi. Istasyonlar arasinda toplam mikrozooplankton bollugu bakimindan istatistiki acidan onemli bir farklilik bulunmamistir (t-test, p< 0.05). Onceki yapilan calismalarla karsilastirmalar, mikrozooplanktonun termal tabakalasma doneminde ust besinsel seviyeler icin onemli bir enerji kaynagi olabilecegini gosterdi. Anahtar Kelimeler : Heterotrofik dinoflagellat, siliyat, mikrometazoa, mikrozooplankton, Karadeniz Abstract Microzooplankton community composition, abundance and related environmental parameters were assessed in estuarine and offshore stations during June to August 2015 in the South Eastern Black Sea. The microzooplankton community was composed of protozoa and metazoa, however, microzooplankton were dominated by protozoa. Protozoan community comprised of heterotrophic dinoflagellates and ciliates in both stations. No sarcodines were observed. Microzooplankton abundance ranged from 332 to 845 cells/l and 203 to 604 cells/l in the estuarine and off-shore stations, respectively. Microzooplankton abundances tended to decrease from June to August. No significant differences were found between sampling stations in terms of microzooplankton abundance (t-test, p< 0.05). Comparison with previous studies showed microzooplankton could be an important energy source for higher trophic levels during thermal stratification. Keywords : Heterotrophic dinoflagellate, ciliate, micrometazoa, microzooplankton, Black Sea