Physiological and ecological studies of Calanus euxinus (Hulsemann) from the Black Sea with comments on its life cycle

Date

1998-01-01

Author

Arashkevich, E
Svetlichny, L
Gubareva, E
Besiktepe, S
Gücü, Ali Cemal
Kideys, AE

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

229
views

0
downloads

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 proportion of spawning females (up to 80% of the total number of adult females). Egg production rate ranged from 5 to 25 eggs/female/day. The percentage of copepods with food changed with location and time; at night it varied from 10 to 97 in the upper layer, being less than 1 at the depth. Food remains was never observed in the guts of diapausing CVs. Up to 60% of gut in the upper layer, being less than 1 at the depth. Food remains was never observed in the guts of diapausing CVs. Up to 60% of gut contents consisted debris. The recognizable remains were parts of crustacean exoskeleton and dynoflagellates 10-60 mkm in size.Shipboard feeding experiments showed extremely low consumptions of chlorophyll (2.39-7.41 ng/ind/d in CVs and 5.67-14.33 ng/ind/d in females). The analysis of size classes distribution allowed the distinction of two groups among both diapausing and active CVs pointing on the heterogenity of the population. No difference between the length of males and females CVs was found. The state of gonad development differed between active and diapausing CVs. In the former gonad size ranged from 0.075 to 0.65 mm, in the latter small (0.1-0.15 mm) gonads before sex differentiation prevailed. An increase in gonad size was accompanied by a decrease in oil content. The active and diapausing CVs differed in their motor activity, respiration and excretion rates. Relationships between these indices and oxygen concentration were obtained. Under all oxygen concentrations studied, the indices for active CVs were higher than for diapausing CVs by a factor of 2 or 3.

Subject Keywords

Black Sea, Hypoxia, Temparature, Vertical migration

URI

https://hdl.handle.net/11511/53880

Collections

Graduate School of Marine Sciences, Conference / Seminar

Suggestions

OpenMETU
Core

Interannual variability of the early summer coccolithophore blooms in the Black Sea: impacts of climatic factors Cokacar, T; Oguz, T; Kubilay, N (2003-08-06) Interannual variability of the early summer (May-June) coccolithophore blooms within surface waters of the Black Sea was studied by means of satellite-based bio-optical observations. The performance of two coccolithophore detection algorithms were tested for Black Sea conditions, and were found to provide comparable spatial patterns consistent with the corresponding true color images. An analysis of six, year-long OCTS and SeaWiFS imagery from 1997 onwards points to the presence of a major phytoplankton blo...
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...
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 ...
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; BAT, LEVENT; ŞAHİN, FATİH (2009-01-01) 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 d...
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...

Citation Formats

E. Arashkevich, L. Svetlichny, E. Gubareva, S. Besiktepe, A. C. Gücü, and A. Kideys, “Physiological and ecological studies of Calanus euxinus (Hulsemann) from the Black Sea with comments on its life cycle,” 1998, vol. 47, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/53880.