Essen, Abteilung Hydrobiologie, Essen, Germany;
Hannnover, Institut für Landschaftspflege und Naturschutz,
3) Hochschule Vechta, Institut für
Naturschutz und Umweltbildung, Vechta, Germany
Study on Near-natural Conditions
of Cetral European Mountain
With Particular Reference to Debris and Beaver
Results of the "REG Meeting" 2000
HERING 1), MARC GERHARD 2),
ELLEN KIEL 3), THOMAS EHLERT 1)
& TANJA POTTGIESSER1)
With 5 Tables
Key words: Debris dams, beaver dams, Castor fiber, Central
Europe, reference conditions, potentially natural conditions,
summarises the results of the "Rhitron Ecology Group"
meeting in Essen (March 2000), supplemented by a literature
An extended view of small mountain
streams in Central Europe under "potentially natural
conditions" is presented. We focus on the potential impact of
natural transverse structures (debris dams and beaver dams) on
stream morphology, hydrology, habitat composition and communities.
Furthermore, impact of other stream mophological features, which
are presently lacking in the Central European landscape, is
We suggest that Central European
mountain streams are characterised by a higher proportion of
lentic zones under "potentially natural conditions".
Morphological degradation leads to a loss of lentic zones and to
an increase of current velocities and coressponding changes in
faunal composition, particularly higher abundance and proportion
of reophilic species and a decrease of species preferring lentic
zones. This should be regarded in future stream assessment.