Publications by authors named "A Lorke"
Article Synopsis
- The study investigates how upper cascade reservoirs in the Mekong River impact phosphorus loading downstream, focusing on its forms and bioavailability in sediment.
- Results reveal that while phosphorus gets trapped in sediments, there is a significant increase of bioavailable phosphorus in reservoirs, especially near the border between China and Myanmar.
- The study suggests that factors like sediment sorting and environmental conditions contribute to this increase, raising concerns about potential eutrophication in the lower Mekong River and highlighting the need for further research on nutrient enrichment risks.
Article Synopsis
- Hydroelectric power plants can produce harmful levels of total dissolved gas supersaturation (TDGS) that negatively impact aquatic life, and a risk assessment model was developed to identify which plants are at higher risk of generating TDGS.
- In Norway's hydropower facilities, 28% were found to be high-risk due to certain turbine types and design features, with over half discharging directly into rivers, and 73% of monitored plants showing biologically significant TDGS levels.
- The situation is less clear in Austria and Germany due to data limitations, with many plants categorized at moderate risk and observed TDGS levels indicating potential environmental concerns; it is recommended to implement systematic screening and monitoring for TDGS in hydropower installations.
Small lentic water bodies are important emitters of methane (CH4) and carbon dioxide (CO2), but the processes regulating their dynamics and susceptibility to human-induced stressors are not fully understood. Bioturbation by chironomid larvae has been proposed as a potentially important factor controlling the dynamics of both gases in aquatic sediments. Chironomid abundance can be affected by the application of biocides for mosquito control, such as Bti (Bacillus thuringiensis var.
View Article and Find Full Text PDFCyanobacterial harmful algal blooms (cyanoHABs) are becoming increasingly common in aquatic ecosystems worldwide. However, their heterogeneous distributions make it difficult to accurately estimate the total algae biomass and forecast the occurrence of surface cyanoHABs by using traditional monitoring methods. Although various optical instruments and remote sensing methods have been employed to monitor the dynamics of cyanoHABs at the water surface (i.
View Article and Find Full Text PDFBenthic fluxes refer to the exchange rates of nutrients and other compounds between the water column and the sediment bed in aquatic ecosystems. Their quantification contributes to our understanding of aquatic ecosystem functioning. Near-bed hydrodynamics plays an important role at the sediment-water interface, especially in shallow lakes, but it is poorly considered by traditional measuring techniques of flux quantification, such as sediment incubations.
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