Yazar "Tok, Cemal Varol" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim
    Öğe
    Can DNA barcode study be done from a museum specimen fixed in a formaldehyde solution? A case of emys orbicularis (Linnaeus, 1758)
    (Çanakkale Onsekiz Mart Üniversitesi, 2024) Günay, Ulvi Kerem; Yakın, Batuhan Yaman; Pipilos, Atakan; Keskin, Emre; Tok, Cemal Varol
    DNA barcoding, a molecular taxonomy technique, has been increasingly used by herptile taxonomists in recent years. In DNA barcoding studies with museum specimens, there are difficulties in achieving success in specimens that have been exposed to formaldehyde, which is usually used as a fixative, for a long time and intensively. Here we studied the effect of formaldehyde on the application of the DNA barcode method in Emys orbicularis specimens stored in 4% formaldehyde and 70% ethanol solution since 2008 and 2014. Sanger sequence analysis of tissues taken from samples stored in both ethanol and formaldehyde solution successfully yielded sequences of 623 bp. In conclusion, the use of ethanol solutions should be preferred for mid or long-term sample storage, especially in the context of molecular studies. In cases where the use of formaldehyde is unavoidable, it may be advisable to use extremely low concentrations to increase success in molecular research.
  • Küçük Resim
    Öğe
    Morphological assessment and head plate variation of lebanon lizard, phoenicolacerta laevis (gray, 1838) from Osmaniye, Türkiye
    (Folium Ltd, 2025) Yakın, Batuhan Yaman; Selçuk, Ahmet Yesari; Günay, Ulvi Kerem; Tok, Cemal Varol
    In this study, the sexual variations of the dorsal, ventral and lateral head plates of P. laevis specimens collected from Osmaniye, Türkiye (southern Anatolia) were examined and various body measurements were measured by classical morphometric methods and sexual variations were determined by both methods. According to the classical morphometrics, male specimens were found to be larger than female specimens in terms of PL, PW, HW but not SVL (PPL < 0.05; PPW < 0.05; PHW < 0.05; PSVL = 0.4741). On the other hand, Ax-In averages were found to be larger in female specimens than in male specimens. In addition, statistically significant differences were found for all ratios. Geometric morphometric analyses showed sexual dimorphism was detected between the dorsal, ventral and lateral head plates. The parietals were wider in males, and the prefrontal narrowed laterally from posterior to anterior. The rostrale was smaller in males, suboculare was backward and higher positioned in females. Inframaxillary positioned more angled in males. All result showed males has a head; wider at posterior and sharp-ened in anterior. Also, for dorsal (P < 0.0001) and, lateral (P < 0.0001) head plates allometric shape changes were observed but not for the ventral (P: 0.1196) head plates.