No abstract

Assessing actual and potential biodiversity of river-floodplain ecosystems on the basis of policy and legislation concerning endangered and protected species is necessary for consistency between different policy goals. It is thus a prerequisite to sustainable and integrated river management. This paper presents BIO-SAFE, a transnational model that quantifies the relevance of species and ecotopes, characteristic of the main channels and floodplains of the rivers Rhine and Meuse, on the basis of international treaties and directives and national Red Data Lists. BIO-SAFE was developed into a tool for biodiversity assessment with regard to design and evaluation of physical planning projects, Environmental Impact Assessments and comparative landscape-ecological studies. It was conceived to be applicable in Germany, France, Belgium and the Netherlands.Taxonomic groups involved are higher plants, birds, herpetofauna, mammals, fish, butterflies, and dragonflies and damselflies. The linkage of habitat requirements of species to ecotopes allows the user to derive information at the level of several ecotope types and scales. The model requires input data on presence of species and/or surface area of ecotopes. BIO-SAFE has been applied to flood risk reduction projects along the rivers Rhine and Meuse. Results show that BIO-SAFE yields quantitative information regarding the degree to which actual situations, reconstruction designs and developments of species and ecotope composition meet national and international agreements on biodiversity conservation.Attuning biodiversity conservation and flood risk reduction measures is a major issue in applied ecology and spatial planning. Assessments with BIO-SAFE can help find an optimal balance. Because of its policy-based character, BIO-SAFE yields information that is complementary to ecological biodiversity indices, single-species habitat models and ecological network analysis. The development of BIO-SAFE was based on species characteristic of rivers and floodplains, but the method can easily be applied to other ecosystems as well.

No abstract

No abstract

This paper examines the relationship between protected and endangered riverine species (target species) and hydrodynamics in river-floodplain ecosystems, combining ecological and policy-legal aspects of biodiversity conservation in river management. The importance of different hydrodynamic conditions along a lateral gradient was quantified for various taxonomic groups. Our results show that (i) target species require ecotopes along the entire hydrodynamic gradient; (ii) different parts of the hydrodynamic gradient are important to different species, belonging to different taxonomic groups; (iii) in particular low-dynamic parts are important for many species and (iv) species differ in their specificity for hydrodynamic conditions. Many species of higher plants, fish and butterflies have a narrow range for hydrodynamics and many species of birds and mammals use ecotopes along the entire gradient. Even when focussing only on target species, the entire natural hydrodynamic gradient is important. This means that the riverine species assemblage as a whole can benefit from measures focussing on target species only. River reconstruction and management should aim at re-establishing the entire hydrodynamic gradient, increasing the spatial heterogeneity of hydrodynamic conditions.