2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/21/2018 | 9:00 AM - 9:15 AM | FLOW REGIMES FILTER SPECIES TRAITS OF BENTHIC DIATOM COMMUNITIES AND MODIFY THE ECOSYSTEM FUNCTIONS OF LOWLAND STREAMS – A NATIONWIDE SCALE STUDY | 410 B
FLOW REGIMES FILTER SPECIES TRAITS OF BENTHIC DIATOM COMMUNITIES AND MODIFY THE ECOSYSTEM FUNCTIONS OF LOWLAND STREAMS – A NATIONWIDE SCALE STUDY
Global changes in land use, climate and flow diversion are key drivers of flow regime change that may eventually affect freshwater biodiversity and ecosystem functions. However, our knowledge on how the functional features of stream organisms vary along the gradient of hydrological disturbance and how flow regimes mediate the ecosystem function in lowland streams is limited. Here we show that species turnover with displacement of sensitive species by tolerant species was the dominating process in benthic diatom communities during high flow disturbances. Ecosystem function was mediated mainly by high and low flow magnitude and high flow frequency. Median daily flow magnitude shows a consistent positive relationship with ecosystem functional indices indicating that larger streams are more resilient to flow perturbations. Furthermore, flow disturbances are less important and show inconsistent correlation to ecosystem function likely due to the interaction of multiple environmental stressors. Our study highlights the robustness of trait-based approaches for identifying flow regime changes in streams, and strongly suggests that biodiversity conservation and water resource management should focus on protecting natural base flow in headwater streams and generally reduce flow regulation for sustaining stream ecosystems under future global changes.
- Anthropogenic
- Climate Change
- Flood
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Presenters/Authors
Naicheng Wu
(), Aarhus University, naichengwu88@gmail.com;
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Tenna Riis
(), Aarhus University, Denmark, Tenna.riis@bio.au.dk;
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Hans Thodsen
(), Aarhus University, hath@bios.au.dk;
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Annette Baattrup-Pedersen
(), Aarhus University, Denmark, ABP@bios.au.dk;
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