Aspect of population structure of the European Pond Turtle (Emys orbicularis) in Lake Yayla, western Anatolia, Turkey

AYAZ D. , Fritz U., ATATUR M. K. , MERMER A. , ÇİÇEK K. , Afsar M.

JOURNAL OF HERPETOLOGY, cilt.42, ss.518-522, 2008 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 42 Konu: 3
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1670/07-096.1
  • Sayfa Sayıları: ss.518-522


Our main objective was to establish the population size, density, body size, and sex ratio of a local Emys orbicularis population. We examined the population structure of E. orbicularis in Lake Yayla, Buldan (Denizli), Turkey, using capture-recapture methods. The population consisted of 54% males, 42% females, and 4% juveniles. The adult sex ratio was significantly skewed in favor of males. Using the Jolly program, the population size was estimated at 1,462 (95% CI = 1,161-1,763), corresponding to a density of 81 turtles per hectare of optimal habitat. Females were larger than males. In carapace length, the Lake Yayla population resembles other small-sized populations inhabiting the southern parts of the species' range. The conservation status of the Turkish populations and their main threats are also discussed.