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1 November 2007 Possible Influence of Beach Sand Characteristics on Green Turtle Nesting Activity on Samandağ Beach, Turkey
Şükran Yalçın-Özdilek, Hasan Göksel Özdilek, F. Sancar Ozaner
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Physical characteristics such as sand grain size and humidity were determined and the relation between the examined parameters and nesting success, nest density, and hatchling success of green turtles on Samandağ Beach, Hatay, Turkey were investigated in this study. Coarse sand and low humidity at the river site and fine sand and high humidity at distances perpendicular to the river mouth were determined. The wind speed and direction toward land on the beach are important factors forming grain structure on Samandağ Beach. The mean particle size, about 350 μm, at nesting locations (N) of green turtles is smaller than that at nonnesting areas (NT and T). Nesting sites have the lowest uniformity coefficients (Cu = 2.78) on the surface than in no-nest no-track sites (Cu = 3.48) and in only-track sites (Cu = 3.5) on the surface. A negative correlation exists between sand moisture and nesting success with respect to increasing distance from Çevlik Harbor for Chelonia mydas. The hatchling success of C. mydas was found to be significantly affected by sand moisture. When sand moisture is above 8%, hatchling success become too low or no successful hatching occurs.

Şükran Yalçın-Özdilek, Hasan Göksel Özdilek, and F. Sancar Ozaner "Possible Influence of Beach Sand Characteristics on Green Turtle Nesting Activity on Samandağ Beach, Turkey," Journal of Coastal Research 2007(236), 1379-1390, (1 November 2007).
Received: 6 January 2006; Accepted: 1 September 2006; Published: 1 November 2007

nest site selection
sand extraction
sand grain size
sand humidity
uniformity coefficient
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