Multiple stressors and pollutants
Freshwaters are used intensively by humans, meaning that they are exposed to a number of stressors. We explore the complex interrelations and impacts of the different stressors: How do nutrients and contaminants enter our surface waters, which factors play a central role in this process, and where are rivers and lakes in a particularly poor state? Nutrient inputs of nitrogen and phosphate, for example, may affect water quality, leading to algal blooms. It is often impossible to completely remove pharmaceuticals and biocides during wastewater treatment. They then end up in rivers and lakes, where they may affect the hormonal metabolism of fish and amphibians. Mining may lead to the contamination of adjacent freshwaters with potash and sulphate. Land use change, urbanisation, water control structures and the increasing use of artificial lighting at night (light pollution) exert additional pressure on our freshwaters. In our research, we acknowledge that use by humans is an important part of reality – only then can future-oriented solutions be developed.
The authors propose that next generation night-time remote sensing missions should consider multiple angles for observations in the visible band. They demonstrate via modeling and examples how the proposed method would leverage light pollution studies and unlock new applications for night-time remote sensing.
Divergent roles of iron and aluminum in sediment organic matter association at the terrestrial–aquatic interface
The authors hypothesized that the variation in sediment redox and pH regime govern how iron (Fe) a.aluminum (Al) interact with organic matter (OM) in near-surface mineral sediments.The reactive monomeric Al preferably binds with organic ligands from less-decomposed OM under acidic and anoxic conditions. Low-crystallinity Fe formed under oxic conditions binds with more microbially-processed OM.
A plea for a worldwide development of dark infrastructure for biodiversity: practical examples and ways to go forward
The authors advocate the worldwide development of a dark infrastructure. This refers to areas and corridors without excessive artificial light at night that protect biodiversity from light pollution. A guide to getting there.
Making waves. Bridging theory and practice towards multiple stressor management in freshwater ecosystems
The authors identified limitations to the development of multiple-stressor management strategies and address these within an empirical framework. They give recommendations for the use of empirical models and experiments to predict the effects of freshwater degradation in response to changes in multiple stressors and offer practical advice for management strategies in 3 multiple-stressor scenarios.
The authors review how different bat guilds respond to artificial light at night (ALAN) and assess how the impacts vary according to ecological context. All studied European species respond for example negatively to a wide range of light colors and intensities close to roosts and drinking sites. The sprawl of ALAN may be a key factor driving the decline of bat diversity.