2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2019 | 11:00 AM - 11:15 AM | RESPONSES OF STREAM FISHES AND MACROINVERTEBRATES TO CATCHMENT LANDUSE AND FINE SEDIMENT | 253 AB
RESPONSES OF STREAM FISHES AND MACROINVERTEBRATES TO CATCHMENT LANDUSE AND FINE SEDIMENT
The stream bed provides an important habitat for macroinvertebrates as well as for the egg and larval development of many fish species. Using examples of endangered freshwater mussels, salmonid and cyprinid fishes, the crucial substrate-dependent physicochemical variables which determine their recruitment success were identified. Fine sediment accumulation and colmation as measured by penetration resistance, redox potentials, sediment traps and bioindication systems were powerful indicators for the exchange rates between open and interstitial water and thus for assessing the habitat quality for specialized and endangered species. Catchment land use and erosion protection measures on different spatial scales were found to be related to fine sediment loading, nutrient input and the biological community composition within the stream. Identification of the origin of fine sediment revealed that the contribution of both the external (i.e. catchment erosion) and internal (i.e. in-stream carbonate precipitation and internal biomass production) sources is important. Consequently, restoration management of flow dynamics is as important as erosion control.
- Sediment
- Non-point Source
- Mussel
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Presenters/Authors
Juergen Geist
(), Technical University of Munich - Aquatic Systems Biology, geist@wzw.tum.de;
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