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Paul, R. (2004). Population viability analysis and effect of conservation measures in emys orbicularis in northeast germany using computer simulation. Biologia (Bratislava), 59(Suppl. 14), 191–200. 
Added by: Admin (06 Jan 2014 18:23:04 UTC)
Resource type: Journal Article
BibTeX citation key: anon2004h
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Categories: General
Keywords: Emydidae, Emys orbicularis, Europa - Europe, Habitat - habitat, Schildkröten - turtles + tortoises
Creators: Paul
Collection: Biologia (Bratislava)
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Abstract     
The European pond turtle (Emys orbicularis) is endangered and protected in Germany. Native relict populations with at most 10–15 individuals per population occur in the northeast of the country. As Germany is part of the species’ natural range, adaptations to the temperate climate are likely. An object-oriented simulation model (Emys-I) was created to reveal the most sensitive parameters in population biology of German pond turtles. During the simulation, mortality of adults and older juveniles had to be very low to ensure population stability. Nest numbers and hatching success had to be sufficient for population recruitment; this seems to be the case under natural conditions. Population stability was also significantly influenced by the sex ratio. However, due to unknown long-term effects the sex ratio should not be manipulated for conservation purposes. Conservation measures for increasing individual numbers were modelled for a wild population. A combination of nest protection and headstarting for two years proved to be most successful; nest protection alone could not ensure sufficient population growth. Conservation measures are recommended to be performed over at last 20 years to produce stable populations and have to be accompanied by a monitoring programme to compare population development and model predictions.
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