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Location of study sites (Y: Ysper; O: Ois; P: Piesting) in the province of Lower Austria in Austria, Europe (insets). Map extracts in circles show the stream sections where faeces of otters (Lutra lutra) were collected (sample sizes are given); the rectangles represent electrofishing sites. For reasons of clarity, tributaries are not shown for river Ysper and Piesting.
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