Development and lipid storage in Calanus euxinus from the Black and Marmara seas: Variabilities due to habitat conditions

Svetlichny, LS
Kıdeyş, Ahmet Erkan
Hubareva, ES
Besiktepe, S
Isinibilir, M
Oil sac volume, gonad size and moulting patterns were investigated in the copepod Calanus euxinus inhabiting deep and shallow zones of the Black Sea and penetrating into the Marmara Sea. In summer the C. euxinus population in deep layers of the Black Sea was dominated by pre-diapause and diapausing postmoult copepodite stage V (CV) with small sexually undifferentiated gonads and mean lipid content of 14.1 +/- 6.0% of body volume. The lipid content of deep-living females was 7.2 +/- 4.2% of body volume. At the same time, intermoult and premoult CV with enlarged gonads and low lipid content (7.7 +/- 5.1% of body volume) and females with oil sac volume of 1.4 +/- 1.0% were found at shallow stations. Premoult CV with oil volume of 0.6 0.8% and mature females with little visual evidence of substantial lipid storage dominated in the Marmara Sea. The differences in moulting patterns and oil sac volumes of C. euxinus from deep zones and shallow regions suggest that vertical migrations to the oxygen minimum zone (OMZ) are necessary for formation of large lipid reserves providing high reproductive potential of this species. On the basis of an energy balance model it was shown that under low phytoplankton concentration of about 30 mu g C 1(-1) preadults and adults migrating to the OMZ could accumulate lipids (up to 5% of body energy content daily), in contrast to copepods constrained to shallow oxic water columns of the Black Sea and from the Marmara Sea.


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...
Population dynamics and morphological variability of Calanus euxinus in the Black and Marmara Seas
İŞİNİBİLİR OKYAR, Melek; Svetlichny, L.; Hubareva, E.; ÜSTÜN, FUNDA; Yılmaz, İsmail; Kıdeyş, Ahmet Erkan; BAT, LEVENT (2009-01-01)
Temporal and spatial changes in abundance, prosome length, oil sac volume, molting patterns and morphometric parameters were studied in Calanus euxinus from the Black and Marmara Seas. In the south-western part of the Black Sea and deep shelf zone near Sinop the abundance of C. euxinus was high during the whole studied period (2000-2005), with a maximum 23,400 ind m-2 in March 2004. In the Marmara Sea near the Prince Islands in the deep zone the mean annual abundance of C. euxinus was 47 times lower than in...
Zooplankton community state in the Northeastern Marmara Sea during early autumn with comments onmass mortality of the Black Sea species due to thesalinity gradient
Svetlichny, Leonid; Hubareva, Elena; Kıdeyş, Ahmet Erkan; İşinibilir Okyar, Melek; Shmeleva, Aleksandra (2006-01-01)
In October 2005 species composition and abundance of mesozooplankton collected in the Black Sea (near the entrance of the Bosphorus) and in the Marmara Sea (near the exit of the Bosphorus and Prince Islands) were studied taking into account the number of live and dead individuals. Along the Bosphorus, the numbers of the Black Sea originated Copepoda species reduced whilst the abundance of Cladocera and Oikopleura dioica increased towards the Marmara. The Black Sea species constituting 78% of total fodder zo...
Salinity tolerance of Calanus euxinus in the Black and Marmara Seas
Svetlichny, Leonid; Hubareva, Elena; Isinibilir, Melek; Kıdeyş, Ahmet Erkan; Belmonte, Genuario; Giangrande, Elisa (2010-01-01)
We investigated how stenohalinic Black Sea Calanus euxinus, when migrating to the north-eastern Marmara Sea, can adapt to the pronounced salinity gradient there. During field observations (2005 to 2008) females of Calanus euxinus with significantly smaller body length (compared with those inhabiting the brackish Black Sea at 17 to 18 psu) were found in the deep, high-saline (similar to 38.5 psu) layers of the Marmara Sea. Similar diameters of eggs laid by small- and large-sized females and similar respirati...
Seasonality of zooplankton in the Southern Black Sea and genetics of Calanus Euxinus (Copepoda)
Ünal, Ebru; Kıdeyş, Ahmet; Graduate School of Marine Sciences (2002)
Seasonality and composition of zooplankton was comparatively studied at two stations (inshore and offshore) off Sinop, in southern Black Sea in 1999. Intra-specific genetic differentiation of the copepod Calanus euxinus dwelling in different layers along the water column was also investigated in samples obtained from different regions of the southern Black Sea in September 2000. A total of 64 zooplankton species were identified in the Sinop region in 1999, most of which being meroplankton. Out of these, 17 ...
Citation Formats
L. Svetlichny, A. E. Kıdeyş, E. Hubareva, S. Besiktepe, and M. Isinibilir, “Development and lipid storage in Calanus euxinus from the Black and Marmara seas: Variabilities due to habitat conditions,” JOURNAL OF MARINE SYSTEMS, pp. 52–62, 2006, Accessed: 00, 2020. [Online]. Available: