Diel vertical distribution, and herbivory of copepods in the south-western part of the Black Sea

Besiktepe, S
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 contribution of the warm water species, Paracalanus parvus. Vertical distribution appeared to be related to season, species, stages of species and the oxygen concentration in the water column. Female, copepodite V (CV) and copepodite IV (CIV) stages of Calanus euxinus and female Pseudocalanus elongatus showed strong diel vertical migration from the surface waters to the oxygen minimum zone (OMZ). Copepodite stage V of C. euxinus showed seasonal migration, and was observed in diapaused phase at the OMZ in June and in September samplings. The large (1000-2000 mum) and medium(500-1000 mum) fractions of copepods had maximum gut fluorescence at night. Total grazing represented 32% of daily total integrated primary production. Phytoplankton carbon ingested met all three fractions of the basic metabolic requirements of the copepod community in the Black Sea.


Seasonal distribution of fish eggs and larvae off sinop (the southern Black Sea) in 1999-2000
Satilmis, HH; Gordina, AD; Bat, L; Bircan, R; Culha, M; Akbulut, M; Kıdeyş, Ahmet Erkan (2003-05-01)
The seasonal distribution of fish eggs and larvae off Sinop, the central southern Black Sea, was studied by using vertical and horizontal tows at two stations at biweekly intervals between January 1999 and November 2000. Besides basic oceanographic parameters, macro gelatinous was also sampled to evaluate their relation to fish eggs and larvae. Eggs or larvae of a total 23 fish species were present in the samples. Most of the species were found to occur during spring and summer. It is observed that especial...
In situ grazing pressure and diet vertical migration of female Calanus euxinus in the Black Sea
Besiktepe, S; Kıdeyş, Ahmet Erkan; Unsal, M (1998-01-01)
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...
Vertical distribution of marine cyanobacteria Synechococcus spp. in the Black, Marmara, Aegean, and eastern Mediterranean seas
Uysal, Zahit (2006-01-01)
The vertical distributions of the unicellular cyanobacteria Synechococcus were studied in several highly contrasting seas: the Black Sea, Sea of Marmara, Aegean Sea, and Mediterranean Sea. Cell abundances varied significantly on both vertical and horizontal scales in all physically and spatially discrete water masses. Epifluorescence microscope cell counts from all seas clearly showed that majority of the population remains suspended in the surface-mixed layer and decreases gradually towards the base of the...
Distribution of phytoplankton in the southern Black Sea in summer 1996, spring and autumn 1998
Eker-Develi, E; Kıdeyş, Ahmet Erkan (2003-03-01)
The species composition, abundance, and biomass of micro- (>15 mum) and nano- (<15 mu m) phytoplankton were studied along the southern Black Sea during June-July 1996 and March-April and September 1998. A total of 150 species were identified, similar to 50% of them being dinoflagellates. The average total phytoplankton abundance changed from 77 x 10(3) Cells l(-1) in spring to 110 x 10(3) cells l(-1) in autumn and biomass from 250 mu g l(-1) in summer to 1370 mu g l(-1) in spring. Based on the extensive sam...
Fate of the Black Sea Acartia clausi and Acartia tonsa (Copepoda) penetrating into the Marmara Sea through the Bosphorus
Hubareva, Elena; Svetlichny, Leonid; Kıdeyş, Ahmet Erkan; Isinibilir, Melek (2008-01-01)
In October 2005 spatial distribution of live and dead Acartia clausi and Acartia tonsil was studied in the Black and Marmara Seas and near the Marmara Sea inlet of the Bosphorus, in order to understand their fate upon transportation between two seas. The morphometric characteristics in both species from all studied areas, and the decreased abundance of A. clausi and A. tonsa from the Black Sea towards the Marmara Sea indicate that the Marmara Sea Acartia populations are formed by recruitment from the Black ...
Citation Formats
S. Besiktepe, “Diel vertical distribution, and herbivory of copepods in the south-western part of the Black Sea,” JOURNAL OF MARINE SYSTEMS, pp. 281–301, 2001, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/64230.