10.2.2004: Forschung CH

Tagfalter mögen Heuwiesen




René Grison, Andreas Bosshard, Peter J. Edwards

In neu angelegten Heuwiesen im Zürcher Oberland wurde das Vorkommen von Tagfalter mit verschiedenen Methoden erfasst. Die Heuwiesen erwiesen sich als wertvolle Habitate für Tagfalter. Zwischen dem Vorkommen der Tagfalter und der Zusammensetzung der Vegetation bestand aber kein sehr enger Zusammenhang.


1) Inventories and mapping of butterflies are presently mostly based on imagines. However, appropriate methods also make it possible to efficiently inventory the pre-imaginal stages, e.g. the hoop-net method. This efficient and time-saving method was used for the quantitative mapping of butterfly caterpillars in the present study.
2) Butterfly caterpillars were searched with the hoop-net method at three test sites in May and June 2001. However, most of the collected animals were caterpillars of moths and larvae of gall wasps. Only very few butterfly caterpillars were caught. Thus, the hoop-net method proved to be unsuitable for a quantitative mapping of butterfly caterpillars.
3) The significance of newly established hay meadows for butterflies was investigated using the transect method at the same three test sites. Flower density was partly highly correlated with the number of butterfly species. The new hay meadows in Berg and in Seewadel appeared to be a highly favourable habitat for butterflies and to contribute to species diversity. The combination of farmland with extensive meadows also increases the heterogeneity of the landscape.
4) The results and the comparison with related studies clearly shows that animal populations are never completely determined by the vegetation. Depending on the local environment, other factors may play a more important role than the dietary or structural composition of the vegetation.

Keywords:
Ecological compensation areas, hay meadows, butterflies, restoration, monitoring methods

Art der Publikation:
Diplomarbeit

Literatur:
Grison R. (2001): Untersuchung der Bedeutung neu angelegter Heuwiesen als Habitat für Tagfalter mit Hilfe quantitativer Erfassung der Raupen und der Imagines. Diplomarbeit, Geobotanisches Institut ETH Zürich.

Kontaktadresse:
Peter J. Edwards, Geobotanisches Institut, Dept. Umweltnaturwissenschaften (D-UMNW), GEO D 7, ETH Zürich, Zürichbergstrasse 38, CH-8044 Zürich
peter.edwards@env.ethz.ch
Tel: +41 (0)1 632 4 330
Fax: +41 (0)1 632 12 15

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