Rivers

For rivers and streams GLOBIO includes cause-effect relationships for two environmental drivers.

Land use and eutrophication

The first environmental driver for rivers and streams is ‘land use and eutrophication’. Over 50 studies on biodiversity in rivers and streams in catchments with different types of land use (forest, agricultural, urban etc.) were found in the literature. Twelve of these expressed their results in a sufficiently quantitative way to be expressed as MSA. These data were fitted by linear regression (see figure). The average results for different biotic groups point to a 0.34 – 0.82 % MSA loss per % land use, with fish being the most sensitive.

Biodiversity intactness of rivers
The relationship between catchment land use and river biodiversity

Change in hydrological regime

The second driver for rivers and streams is the change in hydrological regime. Quantitative data from about 20 studies on biodiversity in rivers at different degrees of flow deviation (e.g. by dams, water extraction or climate change) were combined and expressed as MSA. The data were fitted by logistic regression.

Impact of river regulation
The relationship between river regulation and river biodiversity

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