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Monitoring ranavirus-associated mortality in Dutch heathland in the aftermath of an outbreak

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  1. 1. Monitoring ranavirus-associated mortality in a Dutch heathland in the aftermath of an outbreak Annemarieke Spitzen – van der Sluijs1; Marja Kik2; Andrea Gröne2 ; Jan van den Broek2; Frank Pasmans3; An Martel3; Jolianne Rijks2 1 Reptile, Amphibian and Fish Conservation the Netherlands (RAVON) 2 Utrecht University & Dutch Wildlife Health Centre (DWHC) 3 Ghent University, Faculty of Veterinary Medicine Knoxville, Tennessee, USA (27 – 29 July 2013)
  2. 2. 2/18 Introduction  2010 Common Midwife Toad Virus (CMTV) – like virus outbreak killed thousands Pelophylax sp. and dozens Lissotriton vulgaris (Kik et al. 2010)  Led to many questions, including:  Will ranavirus infection be sustained in this pool?  Will we witness outbreaks in neighbouring pools in 2011?  How is the water quality, are there clear triggering factors?
  3. 3. 3/18 Introduction  Study aim: To document ranavirus disease spatial and temporal patterns in the year following this mass mortality event, and to identify possible disease enhancing factors
  4. 4. 4/18 Study site National Park Dwingelderveld 3700 ha heathland with pools, forest and shifting sands
  5. 5. 5/18 Study site
  6. 6. 6/18 Methods  Fixed disease monitoring protocol for the ponds
  7. 7. 7/18 Conclusions / discussion  Continued presence in pond of 2010 outbreak, and presence in surrounding ponds  Manifested as continuous mortality of all life stages  No clear triggering factors
  8. 8. 8/18 Acknowledgments  Pictures from:, D. Willems, J. Janse, B. Geutskens, J. de Jong, H. Sanders, Google Earth, F. Spikmans  R. Popken & A. Donker (Natuurmonumenten)  Volunteers: D. Willems  Study funded by the Dutch Ministry of Economic Affairs