In situ grazing pressure and diet vertical migration of female Calanus euxinus in the Black Sea

Besiktepe, S
Kıdeyş, Ahmet Erkan
Unsal, M
Gut pigment and abundance of the female Calanus euxinus (Hulsemann) were measured from several water layers (defined by density values), with 3-5 h intervals during 30 h and 21 h at a station in the southwestern Black Sea in April and in September 1995, respectively. The female C. euxinus was observed to begin migration to the upper phytoplankton-rich layer approximately 3 or 4 hours before the sunset. Only a fraction of the female Calanus population (0.2% in April and 3.6% in September) did not migrate but remained at the depth of the oxygen minimum zone during the nighttime. The migrating population was determined to have spent 7.5 h in the euphotic zone in April and 10.5 h in September. The grazing rate of female Calanus euxinus was measured from the gut content data collected from the layers which contain the euphotic zone. The percentage of primary production grazed by the female C. euxinus was calculated as 14.5% in April and 9.5% in September.


Diel vertical distribution, and herbivory of copepods in the south-western part of the Black Sea
Besiktepe, S (2001-04-01)
The abundance and population structure of copepods were studied in the southwestern part of the Black Sea in May 1994, April and September 1995, April, June and September 1996. Vertical distribution and diel vertical migration of copepods were studied in April and September 1995 and June 1996. In addition, the grazing rates of three size classes of copepods-300-500, 500-1000 and 1000-2000 mum-were estimated in September 1995. The total abundance of copepods was higher in June samples due to the large contri...
Zooplankton of the Black Sea and the Eastern Mediterranean Similarities and dissimilarities
Kovalev, Av; Mazzocchı, Mg; Sıokoufrangou, I.; Kıdeyş, Ahmet Erkan (2001-01-01)
A synthesis of data on abundance and biomass of zooplankton in the Eastern Mediterranean (EMED) and the Black Sea shows major differences in the composition and structure of pelagic communities in the two basins. Few Mediterranean planktonic animals have invaded in the Black Sea. The great bulk of Black Sea species is represented by coastal inhabitants that spread throughout the whole basin. This process has been called “neritization” of the Black Sea fauna. Peculiarities in zooplankton assemblages of the B...
Nutritional condition of female Calanus euxinus from cyclonic and anticyclonic regions of the Black Sea
Yuneva, TV; Svetlichny, LS; Yunev, OA; Romanova, ZA; Kıdeyş, Ahmet Erkan; Bingel, F; Uysal, Zahit; Yilmaz, A; Shulman, GE (1999-01-01)
The content and composition of lipids in Calanus euxinus females were studied in cyclonic and anticyclonic regions in the southern Black Sea during the period of persistent density stratification (September 1996). The lipid content of C, euxinus from cyclonic regions was greater than of individuals from anticyclonic regions (average 101.9 and 58.8 mu g ind.(-1), respectively). Total Lipid content (mainly wax esters, 70 to 72%, and triacylglycerols, 8 to 13%) of female C. euxinus was correlated with chloroph...
Porewater redox species and processes in the Black Sea sediments
Konovalov, Sergey K.; Luther, George W.; Yücel, Mustafa (2007-11-15)
During the 2003 KNORR and the 2005 ENDEAVOR cruises to the Black Sea, voltammetric solid-state microelectrode data were collected for the vertical distribution of redox species in porewaters from the upper 200 to 300 mm layer of sediments with nun vertical resolution. We discuss vertical distributions of dissolved sulfide, manganese and iron species in sediments from the oxic, suboxic, anoxic/sulfidic parts of the Black Sea. Results of voltammetric profiling demonstrate many processes governing the porewate...
Basement structure and architecture of the Black Sea Basin
Kaymakcı, Nuretdin; Horn, Brian (null; 2018-01-28)
Black Sea consists of two separate back arc basins which opened at different times during the Cretaceous in response to northward subduction of the Neo-Tethys Ocean. The paucity of well data, complex geometries and seismic imaging challenges mean that questions remain regarding the basement architecture though most authors accept that, at least in part, both these basins are floored by oceanic crust, even though there are no magnetic stripes. Interpretation of deep, long offset seismic data (imaging to more...
Citation Formats
S. Besiktepe, A. E. Kıdeyş, and M. Unsal, “In situ grazing pressure and diet vertical migration of female Calanus euxinus in the Black Sea,” HYDROBIOLOGIA, pp. 323–332, 1998, Accessed: 00, 2020. [Online]. Available: