Seasonal changes in abundance, lipid and fatty acid composition of Calanus euxinus in the South-eastern Black Sea
Tarih
2017Yazar
Sen Ozdemir, N. and Feyzioglu, A. M. and Caf, F. and Yildiz, I.
Üst veri
Tüm öğe kaydını gösterÖzet
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. m(3), 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.
Sigma SSFA, Sigma SMUFA, Sigma SPUFA and Sigma SHUFA were observed to be
correlated with temperature. SSFA and Sigma SMUFA increased with the
rise in temperature (r(2)= 0.74, r(2)= 0.73, p< 0.05, respectively)
whereas Sigma SPUFA and Sigma SHUFA increased as temperature decreased
(r(2)=-0.73, r2=-0.80, respectively, p< 0.05). Additionally, while Sigma
SPUFA and Sigma SHUFA increased (r(2)= 0.61, r(2)=-0.68, respectively,
p< 0.05), Sigma SMUFA decreased (r(2)=-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.
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