Besiktepe, S. (1998). Studies on some ecological aspects of copepods and chaetognaths in the southern Black Sea, with particular reference to Calanus euxinus. Ph.D. Thesis, Middle East Technical University, Ankara, Turkey. 204 pp.
124692
Besiktepe, S.
1998
Studies on some ecological aspects of copepods and chaetognaths in the southern Black Sea, with particular reference to Calanus euxinus.
Ph.D. Thesis, Middle East Technical University, Ankara, Turkey.
204 pp.
Publication
Available for editors
The dominant copepods Calanus euxinus, Pseudocalanus elongatus, Acartia clausi, P ar acalanus parvus and Oithona similis, and a chaetognath Sagitta setosa were investigated with respect to their abundance, vertical distribution and developmental stage composition during May 1994-December 1996 in the southwestern Black Sea. P. parvus, O. similis and A. clausi were most abundant in June, while P. elongatus and C. euxinus reached highest concentration in April and May. The highest number of Sagitta was observed in September. The diel vertical migration was pronounced in copepodite-IV, copepodite-V, female C. euxinus, female P. elongatus and in mature Sagitta. The CV individuals of C. euxinus were observed in diapause phase at the lower layer of oxygen minimum zone, in June and September samplings. Gut pigment content of copepod assemblages and grazing impact on primary production were estimated in September 1995. The medium size fraction (1 000-5 OO um) of copepods was important group in terms of numerical abundance and their grazing impact. About 31.5% of primary production was grazed by copepod assemblages.It was found that, the 14.5% and 9.5% of primary production were consumed by female C.euxinus in April and September respectively. The seasonal differences in total lipid content (TL) of female and copepodite-V Calanus were detected in August 1993, May 1994, September 1995-1996, and the maximum TL was found in September 1995, copepodite-V individuals have higher TL than in females. The wax esters was the major lipids in Calanus. However, triacylglycerides and phospholipids were found in small amounts. Keywords: Black Sea, zooplankton, vertical migration, Calanus, grazing, lipid. IV
