The study of invasive species of herpetofauna in protected areas of the City of Zagreb

The Croatian Herpetological Society – Hyla conducted a monitoring of invasive species of herpetofauna on water surfaces within the two protected areas of the city of Zagreb – The monument of park architecture Park Maksimir and significant landscape Savica. The studies were carried out in the period from September to October 2015. The project contractor was the Public institution "Maksimir". Three species of non-native turtles have been recorded in Croatia: pond slider (Trachemys scripta), chinese softshell turtle (Pelodiscus sinensis) and false map turtle (Graptemys pseudogeographica), and two subspecies of the genus Trachemys were recorded in the study area – red-eared slider (Trachemys scripta scripta) and yellow-bellied slider (T. scripta elegans). They naturally inhabit the southeastern part of the USA. Monitoring is carried out in such a way that the specimens of T. scripta were counted through three separate methodologies to test their effectiveness. The method of line transects along the coast yielded the best results. The estimated number of individuals in the area of Maksimir is between 500 and 700 individuals, while the estimation for Savica is approximately 100 individuals. The lakes in Savica and Maksimir are located in the urban area of the city, and a large number of foreign red-eared sliders was found. Since these sites are close to or are associated with a major river system (Sava River), it is necessary to monitor population trends and develop a management plan for this species.



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