Development of Calanus euxinus during spring cold homothermy in the Black Sea

Svetlichny, Leonid S.
Yuneva, Tatyana V.
Hubareva, Elena S.
Schepkina, Alla M.
Besiktepe, Sengul
Kıdeyş, Ahmet Erkan
In copepodites and adults of Calanus euxinus abundance, body length and weight, chemical composition and respiration rate in relation to age were studied during the cruise of R/V 'Knorr' in April 2003 in the southwestern Black Sea and in laboratory experiments. Data on morphology and physiology of C. euxinus collected during other seasons were also used in comparative analyses. At high concentrations of the diatom Proboscia alata during spring homothermy (6.8 to 8.5 degrees C) C. euxinus did not undertake diel vertical migrations to the oxygen minimum zone (OMZ). The majority of the population was located above the OMZ, feeding on phytoplankton during nighttime and daytime whilst nearly 10%, of copepodite stages IV and V (CIV and CV) and adults remained constantly in the OMZ. Although a diapausing stock of the population began to form in the OMZ, the majority of CV developed without diapause. The development times of copepodite stages at 8 C were determined on the basis of field observations of ontogenetic changes in carbon content and calculated absolute growth rates. Development time from CI to CV amounted to 22 d. In CV the time for lipid deposition from 0.008 +/- 0.007 mm(3) in postmolts up to a maximum volume of 0.165 +/- 0.054 mm(3) in intermolts constituted 26 d. The total generation time from eggs to adults is not less than about 66 d.


Physiological and ecological studies of Calanus euxinus (Hulsemann) from the Black Sea with comments on its life cycle
Arashkevich, E; Svetlichny, L; Gubareva, E; Besiktepe, S; Gücü, Ali Cemal; Kideys, AE (1998-01-01)
Ecological and physiological study of Calanus euxinus population from the Black Sea was carried out during the cruise of RN Bilim in Autumn 1996. The population was divided into two: active individuals, represented by all developmental stages, and diapausing CVs. The active CIV-CVIs underwent daily vertical migrations, while the diapausing CVs stayed at depth all day long. The population seemed to reproduce actively indicated by the large number of eggs and nauplii in the samples as well as the large propor...
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 ...
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...
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 (2006-01-01)
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 t...
Distribution of the alien ctenophore Mnemiopsis leidyi in the Caspian Sea in August 2001
Kıdeyş, Ahmet Erkan (2003-01-01)
In this study, spatial and vertical distributions of the invasive ctenophore Mnemiopsis leidyi in the Caspian Sea were evaluated by using data collected at 41 stations during the August 2001 cruise. A comparison of data from different depths revealed that M. leidyi were generally confined to surface waters. The maximum size of the ctenophore was only 41-45 mm, and the bulk of individuals (85.5%) were < 10 mm in length. The average and maximum biomasses of M. leidyi were calculated as 120 and 351 g wet weigh...
Citation Formats
L. S. Svetlichny et al., “Development of Calanus euxinus during spring cold homothermy in the Black Sea,” MARINE ECOLOGY PROGRESS SERIES, pp. 199–213, 2009, Accessed: 00, 2020. [Online]. Available: