Seasonal Changes in GIucose-6-phosphate Dehydrogenase Activity in the Tissues of Black Sea Mussel

2000 ◽  
Vol 36 (5) ◽  
pp. 5
Author(s):  
O. S. Rusinova
Keyword(s):  
Dehydrogenase Activity ◽  
Black Sea ◽  
Seasonal Changes

scholarly journals Seasonal changes in abundance, lipid and fatty acid composition of Calanus euxinus in the South-eastern Black Sea

2017 ◽  
Vol 64 (3) ◽  
Author(s):  
N. Sen Ozdemir ◽  
A. M. Feyzioglu ◽  
F. Caf ◽  
I. Yildiz
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Black Sea ◽  
Lipid Content ◽  
Seasonal Changes ◽  
Total Lipid Content ◽  
Trophic Levels ◽  
The South ◽  
South Eastern

Seasonal changes in abundance, lipid and fatty acid composition of Calanus euxinus Hulsemann, 1991 were analysed monthly during the period from March 2012 to February 2013. The highest abundance of C. euxinus was recorded in February (847 ind. m-3) during the sampling period. Female and male C. euxinus peaked in February (587 ind. m3, 169 ind. m-3, respectively). However, copepodites peaked in November (107 ind. m-3). Average total lipid content was determined as percentage (%) and per individual (mg ind-1). It was proportionally highest in February (7.03%) and lowest in September (3.02%). However, average lipid content per individual was highest in February (0.11 mg ind-1) and lowest in September and November (0.04 mg ind-1). Major fatty acids in C. euxinus were identified as 16:0, 16:1 n-7, EPA and DHA. ΣSFA, ΣMUFA, ΣPUFA and ΣHUFA were observed to be correlated with temperature. ΣSFA and ΣMUFA increasedwith the rise in temperature (r2=0.74, r2=0.73, p<0.05, respectively) whereas ΣPUFA and ΣHUFA increased as temperature decreased (r2=-0.73, r2=-0.80, respectively, p<0.05). Additionally, while ΣPUFA and ΣHUFA increased (r2=0.61, r2=-0.68, respectively, p<0.05), ΣMUFA decreased (r2=-0.68, p<0.05) as chlorophyll-a increased. It was observed that the degree of unsaturation increased as temperature decreased. Results of the study revealed that C. euxinus has rich lipid content as well as fatty acid composition and it plays an important role in the South-eastern Black Sea ecosystem functionalities especially having key role in energy fluxes to higher trophic levels.

scholarly journals Seasonal Changes in the Hydrochemical Structure of the Black Sea Redox Zone

Oceanography ◽  
2005 ◽  
Vol 18 (2) ◽  
pp. 48-55 ◽  
Author(s):  
Evgeniy Yakushev ◽  
Oleg Podymov ◽  
Valeriy Chasovnikov
Keyword(s):  
Black Sea ◽  
Seasonal Changes ◽  
The Black Sea ◽  
Redox Zone

scholarly journals The evaluation of seasonal fatty acid composition and food sources of Pileurobrachia pileus (Ctenophora) in terms of trophic marker fatty acids in the Southeastern Black Sea

2021 ◽  
Vol 38 (2) ◽  
pp. 211-218
Author(s):  
Nurgül Şen Özdemir ◽  
Ali Muzaffer Feyzioğlu ◽  
Fatma Caf
Keyword(s):  
Fatty Acids ◽  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Black Sea ◽  
Lipid Content ◽  
Seasonal Changes ◽  
Food Sources ◽  
Epa And Dha ◽  
Trophic Markers

Seasonal changes of the lipid and fatty acid composition of Pleurobrachia pileus investigated monthly from March 2012 to February 2013. Average total lipid content was determined as percentage (%) and per individual (mg ind-1). It was highest in February (1.48 %; 3.55 mg ind-1). However, it was proportionally the lowest in April (0.40 %), and per individual in August (0.33 mg ind-1). Major fatty acids of P. pileus were identified as 16:0, 14:0, 11:1 n-9c, 20:5 n-3, and 22:6 n-3. P. pileus had on average 27.27 % ∑SFA, 25.04 % ∑MUFA and 47.63 % ∑PUFA content. EPA and DHA were the major fatty acids from PUFA. Seasonal changes of DHA were more obvious than EPA (p<0.05). Herbivore calanoid zooplankton trophic markers; 20:1 n-9 and DHA/EPA and herbivory trophic markers; EPA and DHA content were high in P. pileus fatty acids. It showed that herbivory fatty acids were taken by feeding from herbivory zooplankton and phytoplankton. Diet was an important factor in seasonal fatty acid changes of P. pileus. In addition, we revealed that P. pileus has a rich lipid content and fatty acid composition and plays an important role in the Southeastern Black Sea ecosystem functionalities between herbivory and carnivory species.

scholarly journals Dynamics of physiologically active cells of pico- and nanophytoplankton in the coastal waters of Black Sea

2016 ◽  
Author(s):  
Ekaterina Solomonova
Keyword(s):  
Flow Cytometry ◽  
Enzyme Activity ◽  
Environmental Factors ◽  
Black Sea ◽  
Coastal Waters ◽  
Seasonal Changes ◽  
Warm Season ◽  
Study Groups ◽  
Living Cells ◽  
Intracellular Enzyme

The dynamics of the abundance and viability index (VI) of pico- and nanophytoplankton in the coastal waters of Black Sea near Sevastopol were investigated by regular monthly monitoring using flow cytometry and fluorescein diacetate vital dye (FDA), as a marker of intracellular enzyme activity. Directed seasonal changes in the fraction of physiologically active cells in the study groups of algae in coastal waters was not identified. It is noted that, in the warm season and during vegetative growth of algae in the composition and pico nano-phytoplankton predominate living cells, the percentage of which varies from 70 to 100 %. Low values of the VI (30 %) picophytoplankton were obtained at individual stations in September, October and December, possibly due to the presence of this kind of cell size group Synechococcus, which are very sensitive to fluctuations of environmental factors. Refs 28. Figs 7.

Seasonal changes of nutrients and oxygen in the Bulgarian Black Sea coastal area

2002 ◽  
Vol 46 (8) ◽  
pp. 137-143 ◽  
Author(s):  
G. Shtereva ◽  
A. Krastev ◽  
O. Hristova
Keyword(s):  
Oxygen Saturation ◽  
Black Sea ◽  
Seasonal Dynamics ◽  
Coastal Area ◽  
Seasonal Changes ◽  
Sea Area

The paper discusses the seasonal dynamics of nutrients and oxygen during the period 1995-1998 in comparison to the previous periods. This study is based on monthly and seasonally monitoring in the 3-20 n.m. zone along the Bulgarian Black Sea area. The investigation reveals certain shifting of seasonal maximums (minimums) and a trend of decreasing oxygen saturation, phosphorus and silicon in the last few years.

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