Weiterentwicklung und Anpassung des nationalen ...

taxa list
information about
organic pollution
information about
acidification
Figure 3: Scheme of stressor-specific river assessment with benthic invertebrates.
The modular structure enables the output of assessment results on different levels:
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information about
general degradation
value
Level 1: Ecological Quality Class
reference condition
value
value
restoration measures
Level 2: Causes of degradation
(organic pollution, acidification,
general degradation)
Level 3: Results of the Core Metrics
(useful for data interpretation purposes)
Ecological
Quality Class
Level 4: Results of all metrics, including those, which have
not been used for the Multimetric Index
Figure 4: The output of the assessment system is composed of levels 1 and 2 (mainly
used for assessment purposes) and levels 3 and 4 (mainly used for data interpretation.)
The ecological quality class is calculated from the results of the individual modules. If
the module “organic pollution” gives a “high” or “good” quality class, the modules are
combined by the worst case principle, since in these cases both modules are
supposed to give independent results. If the module “organic pollution” give a
“moderate”, “poor” or “bad” quality class, organic pollution is likely to affect the module
“general degradation”, too. In these cases the result of the module “general degrada-
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