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. 2009 Jul 16;4(7):e6246. doi: 10.1371/journal.pone.0006246

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Nicholls, Racey.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(a) short pulse length (0.08 µs) radar signal from a rotating antenna. (b) short pulse length (0.08 µs) signal from a fixed antenna. (c) medium pulse length (0.3 µs) signal from a fixed antenna. Each bar represents the difference in bat counts (the number of times that ultrasound was detected by the automatic bat recording stations) between control and experimental trials. A negative value indicates that bat activity was higher during the control trial than during the experimental trial when the radar was switched on.