Table 2. Numbers of processed samples and spirochaetal prevalence in waterfowl faeces collected at the Villafáfila Lagoons Nature Reserve in the winter of 2011-2012.

				No. of samples
Common name	Scientific name	November 2011	January 2012	Total	No. of positive
Graylag goose	Anser anser	49	98	147	34 (23.1%)
Mallard	Anas platyrrynchos	34	-	34	17 (50.0%)
Common crane	Grus grus	16	-	16	-
Great bustard	Otis tarda	8	-	8	-
Total		107	98	205	51 (24.9%)