Bat data : Czech Republic, Brno
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Four bat detectors were used, D-980 Pettersson, SKYE, and 2 QMC Mini. We made acoustic recordings of bats within the town of Brno, Czech Republic (230 km2, 350,000 inhabitants), from March till October 1993. The same habitat types were sampled under the same conditions as in 1977 (Gaisler, 1979). Most observations started 10 min after sunset, on the nights of new and full moon (‹ 1 night), and lasted 30 min. In total, we covered 55 such transects labelled `standard' which encompassed 1650 min of monitoring. Standard transects were used for all comparisons.