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    Comparison of the physical properties of two Green Turtle (Chelonia mydas) nesting beaches (Akyatan and Samandag) in the eastern Mediterranean (Reptilia: Cheloniidae)
    (Taylor & Francis Ltd, 2013) Sonmez, Bektas; Turan, Cemal; Ozdilek, Sukran Yalcin
    The physical properities of sea turtle nesting beaches may strongly influence embryo development and hence conservation planning. In this study, we compared the characteristics of two nesting beaches of Green Turtles, Chelonia mydas, at Akyatan and Samandag in southern Turkey. A total of 48 sand samples from 48 nests was examined and compared in respect to moisture content (M), temperature (TT), electrical conductivity (EC), salinity (S), total dissolved solution (TDS), pH, air ratio (AR), sand grain size together with distance from sea (DFS), depth (ND), incubation period (ID) and hatching success. Significant differences between the two areas were found in nest chamber moisture, conductivity, salinity, total dissolved solution and sand grain size. In a principal component analysis (PCA), the first component explained 45.1% of the variability and was dominated by the effects of the TDS, EC, S, pH and M. The second component explained 24.2 % of the variation and was dominated by the contributions of the TT, ID and ND. This is evidence that moisture plays a more important role than thermal properties in differentiating between the two beaches.
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    The effect of relocation on the morphology of Green Turtle, Chelonia mydas (Linnaeus, 1758), hatchlings on Samandag beach, Turkey (Reptilia: Cheloniidae)
    (Taylor & Francis Ltd, 2011) Sonmez, Bektas; Turan, Cemal; Ozdilek, Sukran Yalcin
    We studied the impact of nest relocation in Green Turtles, Chelonia mydas (Linnaeus, 1758), on hatchling morphology at Samandag, Turkey, and examined 350 hatchlings taken equally from both natural nests and relocated nests. The nuchal, vertebral and costal series were the most variable and the supracaudal scutes were almost stable for the hatchlings in both groups. There were significant differences in all sets of nuchal, costal and marginal except vertebral seines between hatchlings from natural and relocated nests. Hatchlings from relocated nests also had a smaller straight carapace width and lower weight than hatchlings from natural nests. Furthermore, hatchlings from relocated nests had smaller left and right fore limb lengths than hatchlings from natural nests. There were significant differences between both nests in incubation duration and moisture content. Relocation thus has a negative effect on hatchling morphology and consequently on the fitness of hatchlings. The smaller size of hatchlings (with scute variations) results in reduced fitness. In spite of the relocation of nests being an important protection technique, it has a negative effect on the morphology and probably on the viability of hatchlings.
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    Öğe
    FIRST RECORD OF THE INDIAN OCEAN TWOSPOT CARDINALFISH, CHEILODIPTERUS NOVEMSTRIATUS (ACTINOPTERYGII: PERCIFORMES: APOGONIDAE), FROM TURKISH MARINE WATERS
    (Pensoft Publishers, 2015) Turan, Cemal; Erguden, Deniz; Uygur, Necdet; Gurlek, Mevlut; Erdogan, Zeliha A.; Sonmez, Bektas; Uyan, Ali
    Indian Ocean twospot cardinalfish, Cheilodipterus novemstriatus (Ruppell, 1838), is recorded for the first time from the Turkish marine waters. Two specimens of C. novemstriatus were sampled with a purse seiner on 1 December 2014, and also a school of C. novemstriatus was photographed during scuba diving at a depth of 13 m on a rocky surface on 8 December 2014 in the Cevlik coast, Iskenderun Bay, north-eastern Mediterranean of Turkey. With the present report, the number of alien cardinal fish species reported in the Turkish coasts has reached five.
  • Küçük Resim
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    Some properties of new nesting areas of sea turtles in north-eastern Mediterranean situated on the extension of the Samanda Beach, Turkey
    (Triveni Enterprises, 2006) Yalcin-Ozdilek, Sukran; Sonmez, Bektas
    One of the most endangered species in tropical seas, Chelonia mydas (green turtles) prefer undisturbed sand beaches to lay their eggs. While Caretta caretta lays their eggs all over the Mediterranean beaches of Turkey, C. mydas nesting locations are limited with north-eastern site (Alata, Kazanh, Akyatan and Samandag) of the country and some beaches in Cyprus. UnN 2003, no nesting place of both species between Akyatan and Samandag was recorded. From north to south, the beaches examined in 2003 summer are Arsuz, Konaclk, Kale, Tr-H-3, Tr-H-2, and Tr-H-1 in addition to well-known and studied nesting beaches of sea turtle species in Hatay Province: Cevlik, Seyhhizir and Meydan. Since the Hatay Provincial Coast between Cevlik and Arsuz is hilly and no stabilized road is available, these small beaches were not known to have both C. mydas and C. caretta nests. Some physical and chemical sand properties, the number of nests belong to both species and selected nest specifications were investigated in this study. Kale Beach was found to be the most important nesting place in this less populated area. Based on results, Kale, Tr-H-3 and Tr-H-1 beaches were recorded to have high hatchling success.