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Articles by Onder Duysak
Total Records ( 2 ) for Onder Duysak
  Levent Sangun , Soner Cankaya and Onder Duysak
  In this study, canonical correlation analysis was applied to estimate relationships between length characters mantle length (cm), upper hood length (cm), lower hood length (cm), cuttle bone line zone length (cm), cuttle bone free zone length (cm) and weights characters body weight (g), stomach weight (g), stomach wall weight (g), digestive gland weight (g) of 697 cuttlefish (Sepia officinalis) populations caught from Iskenderun bay from 2006-2007, Eastern Mediterranean region, Turkey. The first 3 of the estimated canonical correlation coefficients between the pairs of canonical variables were found significant (0.949, 0.358, 0.294 and p<0.01). The results obtained from canonical correlation analysis indicated that mantle length had largest contribution for the explanatory capacity of canonical variables estimated from length characters of 697 cuttlefish (Sepia officinalis) when compared with other length characters while body weight had largest contribution for the explanatory capacity of canonical variables estimated from weight characters when compared with other weight characters. The results of this study showed that mantle lenght should be used with the aim of estimating weight per Sepia officinalis individuals in common cuttlefish genotypes.
  Onder Duysak , Ayse Bahar Yilmaz and Yavuz Mazlum
  In this study, the concentrations of heavy metals (Cd, Cr, Cu, Fe, Mn, Pb and Zn) were determined in gastral, tentacular and epidermal (umbrella) tissues of jellyfish Ropilema nomadica from 2 stations (Yumurtalik and Arsuz) in Iskenderun Bay, Turkey. Heavy metal concentrations varied significantly depending on the type of the tissue and location of stations. The average metal concentrations in gastral and tentacular were found higher than umbrella tissues in all samples. The level of Mn and Zn concentrations were significantly different among the tissues in both stations (p<0.05). The aim of this study was to imply potential of heavy metal accumulation in jellyfish which plays an important role in biological transfer and Summer blooms. Moreover, this is the first study of the heavy metal bioaccumulation on R. nomadica in Northeastern Mediterranean.
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