2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/24/2018 | 9:00 AM - 9:15 AM | DETRITUS AND EUTROPHICATION OF STREAMS | 321
DETRITUS AND EUTROPHICATION OF STREAMS
Detritus is a key carbon input into freshwaters, and the idea of heterotrophic and autotrophic state more clearly represents ecosystem structure than a view centered solely on autotrophic. Maintaining biotic integrity and biodiversity is one regulatory goal in freshwaters. A long-time key endpoint for carbon inputs has been maintaining dissolved oxygen by limiting inputs of biochemical oxygen demand. Detrital endpoints for inorganic nutrient pollution are less clear as biotic integrity and ecosystem respiration rates are more variable. Substantial data are accruing that indicate that both N and P additions can alter the heterotrophic state, the food web that depends upon detritus, diversity, and central ecosystem functions such as carbon sequestration. Additionally, bioassays indicate that heterotrophic activity can be stimulated by nutrients in streams across the US. Analysis of a large data set on Midwestern US nutrients and stream invertebrates shows that shredder diversity is dependent upon total P with high diversity at low total P levels. These levels are in line with reference nutrient estimates for these ecoregions.
- Carbon
- Allochthonous
- Nutrients
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Presenters/Authors
Walter Dodds
(), Kansas State University, wkdodds@ksu.edu;
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