Do Dams Cause Eutrophication
“do dams cause eutrophication”
Summary
Damming typically lengthens water residence time and traps nutrients, which enhances primary productivity and often leads to algal blooms and eutrophication in reservoirs and downstream reaches. Although some dams retain nutrients and can reduce downstream nutrient loads, the predominant impact of dam construction is to promote eutrophic conditions.
Sources 59 searched
- Assessment of the impact of dams on aquatic food webs using stable isotopes: Current progress and future challenges - ScienceDirect
Our study highlights the importance of high-quality food resources for aquatic food webs as water nutrients increased in stream ecosystems and provides a nutritional perspective to understand the mechanisms how eutrophication affects aquatic ecosystems. ... Moreover, habitat fragmentation due to dams could result in species loss but also the addition of other species downstream of the dams, thus altering beta diversity (i.e., changes in species diversity between communities within a region) by modifying longitudinal patterns of turnover (degree of species replacement) and nestedness (subset of species present in the most diverse site) (Ganassin et al., 2021).
- Nutrients retention of a series of small dam-impacted urban rivers in northern China - ScienceDirect
The dam-regulated river investigated in this study has suffered from eutrophication and bloom of both invasive plants and phytoplankton, since the installation of these small rubber dams. Further studies to provide an in-depth understanding of the transport and fate of different nutrient species in dam-regulated rivers could be helpful in nutrient management and eutrophication control.
- Nitrogen cycling processes and the role of multi-trophic microbiota in dam-induced river-reservoir systems - ScienceDirect
However, the longer hydraulic residence time and the higher transparency may promote primary productivity and nutrient transformation within reservoirs, resulting in increased eutrophication downstream (Chen et al., 2018). Reservoirs tend to facilitate the retention of nutrients from rivers in large quantities. Taylor Maavara from the University of Waterloo has quantified the effects of dams on C, P, Si, and N fluxes based on global data.
- Eutrophication: Causes, Consequences, and Controls in Aquatic Ecosystems | Learn Science at Scitable
Citation: Chislock, M. F., Doster, E., Zitomer, R. A. & Wilson, A. E. (2013) Eutrophication: Causes, Consequences, and Controls in Aquatic Ecosystems. Nature Education Knowledge 4(4):10 · Eutrophication is a leading cause of impairment of many freshwater and coastal marine ecosystems in the world.
- What is eutrophication?
Harmful algal blooms, dead zones, and fish kills are the results of a process called eutrophication — which occurs when the environment becomes enriched with nutrients, increasing the amount of plant and algae growth to estuaries and coastal waters.
- Are nutrients retained by river damming? - PMC
This nutrient transfer from transiting river water to the sediment causes removal of nutrients via burial and dinitrogen gas production by denitrification and Anammox. This retention from dam construction reduces nutrient supply to downstream ecosystems and thus partly alleviates eutrophication.
- How Dams Affect Water and Habitat on the West Coast | NOAA Fisheries
Ecosystem ModificationChanging a habitat from a river to a lake can have many negative effects on fish. The presence of the dam may also change the way predators and prey interact. In many cases the negative effects of these changes are greater than the direct effects of the dam itself.Loss ...
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