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Basic principles and ecological consequences of altered flow regimes for aquatic biodiversity
Stuart E Bunn1, Angela H Arthington
1Cooperative Research Centre for Freshwater Ecology, Centre for Catchment and In-Stream Research, Faculty of Environmental Sciences, Griffith University, Nathan, Queensland, Australia 4111. S.Bunn@mailbox.gu.edu.au
Environmental Management
|December 17, 2002
Summary
Altered river flow regimes significantly impact aquatic ecosystems by changing physical habitats, disrupting species
Area of Science:
- River ecology
- Hydrology
- Aquatic biodiversity
Background:
- Flow regime is a primary driver of river and floodplain wetland ecosystems.
- Hydrology directly influences aquatic biodiversity through habitat, life history, and connectivity.
Purpose of the Study:
- To review key principles linking hydrology and aquatic biodiversity.
- To illustrate the impacts of altered flow regimes on riverine ecosystems.
- To highlight challenges in predicting biotic responses to flow alterations.
Main Methods:
- Literature review focused on four key principles connecting flow and biodiversity.
- Analysis of impacts across riverine plants, invertebrates, and fish.
- Identification of difficulties in distinguishing flow effects from land-use change.
Main Results:
- Flow regime dictates physical habitat, influencing biotic composition.
- Aquatic species' life histories are adapted to natural flow patterns.
- Altered flow regimes facilitate invasive species success and disrupt connectivity.
Conclusions:
- Flow regime alterations have broad impacts on riverine ecosystems.
- Current understanding of flow-biodiversity relationships remains largely hypothetical.
- Further manipulative and experimental research is needed for restoration and ecosystem response measurement.