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, vol.42, no.3, pp.518-522, 2008 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 42 Issue: 3
  • Publication Date: 2008
  • Doi Number: 10.1670/07-096.1
  • Title of Journal : JOURNAL OF HERPETOLOGY
  • Page Numbers: pp.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.