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

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Date

2009-01-01

Author

Svetlichny, Leonid S.
Yuneva, Tatyana V.
Hubareva, Elena S.
Schepkina, Alla M.
Besiktepe, Sengul
Kıdeyş, Ahmet Erkan
BAT, LEVENT
ŞAHİN, FATİH

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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.

Subject Keywords

Calanus euxinus, Lipid storage, Respiration, Growth, Black Sea, Spring cold, Homothermy

URI

https://hdl.handle.net/11511/31632

Journal

MARINE ECOLOGY PROGRESS SERIES

DOI

https://doi.org/10.3354/meps07740

Collections

Graduate School of Marine Sciences, Article

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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...
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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: https://hdl.handle.net/11511/31632.