Mag. Michael Plank


PDF im Hochschulschriften-Service der Universit├Ąt Wien

Use of the forest canopy by bats in temperate forests of Central Europe.

In this study parallel ground and canopy recordings of bat calls were compared in order to analyze the vertical stratification in a temperate forest in Central Europe. The recording effort was 48 nights, by sampling 16 sites three times during the year 2010. During this study, 2170 sequences were recorded with 40 % of these in the canopy level. Overall 16 bat species could be determined. On the ground level 13 species where recorded, compared to 14 species in the canopy. By calculating GLMMs for eight species with sufficient data, the effect of stratum, time period, temperature, and habitat structure on the bat activity was analyzed. The A clear preference for the ground level was proven for four bat species. Myotis bechsteinii was the only species, which had a significant preference for the canopy level in all three periods, whereas three further species showed a clear canopy preference in at least one period. Therefore, canopy sampling should be taken into account for certain species. For conservation measures and monitoring efforts it must be considered, that the canopy stratum of the forest is very important. Some target species will be underestimated by ground measurements alone.