Aletsee, M., 2010. Classification of dystrophic ponds by means of the TWINSPAN algorithm for an ecological characterisation of the Odonata habitats in the Hohe Venn /Hautes Fagnes (Germany/Belgium). Brachytron 12 (1/2): 50-59. Abstract The Hohe Venn contains a large number of mired paisa. Regarding the Odonata, there are two types of reproduction habitats, the ones with a central, open water body (shallow pool, Kolk) and the ones with at most times a shallow, temporary water body (shallow, Schlenke). Huge parts of the fens in this area were destroyed by afforestation and intensive draining (Kamp, 1962). At the beginning of the 1990s, some paisa were restored by filling up the drains with clay (Paulissen, 1997). This paper compares a descriptive morphologic-genetic classification of the habitats of Odonata with a classification using the TWINSPAN algorithm. We discuss in particular the potential of recolonisation of the restored paisa. Some characteristic and very rare species like Aeshna subarctica and Somatochlora arctica could not be found in the recently developed habitats, while others such as Coenagrion hastulatum and more euryoecious species, i.e. that those that tolerate very different environmental conditions, have successfully established themselves.

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Manfred Aletsee. (2010). Classification of dystrophic ponds by means of the TWINSPAN algorithm for an ecological characterisation of the Odonata habitats in the Hohe Venn /Hautes Fagnes (Germany/Belgium). Brachytron, 12(1/2), 50–59.