Drivers of spatio-temporal variation in mosquito submissions to the citizen science project ‘Mückenatlas’
A mosquito monitoring programme was initiated in Germany in 2011, which has been complemented by the citizen science project ‘Mückenatlas’ since 2012. The authors analysed the Mückenatlas dataset to investigate causes of variation in submission numbers and to reveal biases induced by opportunistic data collection.
Mesopelagic microbial carbon production correlates with diversity across different marine particle fractions
The vertical flux of marine snow reduces atmospheric CO2. In particular, particle associated prokaryotes are responsible for organic C-loss. Analysis of prokaryotic heterotrophic production a. species richness in the North Atlantic reveal that C- loss a. associated microbial richness are different with particle fractions. Especially large, fast-sinking particles drive C-flux a. -sequestration.
Zooplankton carcasses stimulate microbial turnover of allochthonous particulate organic matter
This study investigated whether the microbial degradation of more refractory organic matter (OM) is stimulated by the addition of well available OM from dead zooplankton. A significantly higher respiration was measured when zooplankton-derived OM was added to ratio of 1:1. Stimulation was stronger in a complex microbial community with eukaryotes than just bacteria.
Metabolomics-derived marker metabolites to characterize Phaeocystis pouchetii physiology in natural plankton communities
Phaeocystis pouchetii regularly dominates Arctic marine plankton and is considered a key food source supporting highly productive fisheries. But the relevance of biomass transfer to higher trophic levels is debated. This study shows that endometabolic markers can be correlated to the metabolic state of Phaeocystis populations, which allows testing the influence on zooplankton trophic transfer.
Speaking their language – Development of a multilingual decision-support tool for communicating invasive species risks to decision makers and stakeholders
Decision-support tools have been developed mostly in English language only. To reduce language-based uncertainty, the “ecology-of-language” paradigm was applied when developing the Aquatic Species Invasiveness Screening Kit (AS-ISK), a decision-support tool that offers 32 languages in which to carry out screenings and communicate outcomes to stakeholders.
Advective lateral transport of streamwise momentum governs mixing at small river confluences
Mixing within confluences is highly variable.This study relates patterns and amounts of mixing to three‐dimensional flow structure at three small confluences. The study indicates that generalization of mixing at confluences remains challenging but that advective lateral fluxes of streamwise momentum related to secondary currents or primary flow greatly enhance mixing at confluences.
Density effects at a concordant bed natural river confluence
Confluences are locations of complex hydrodynamic conditions within river systems. The effects on hydrodynamics and mixing of temperature‐induced density differences between incoming flows were investigated at a small‐size concordant bed confluence.
Performance of one-dimensional hydrodynamic lake models during short-term extreme weather events
Little is known about the accuracy of numerical lake models during short-term events. Three 1D lake models reproduced the overall impacts of storms and heatwaves well. Timing of effects was simulated accurately and there was little consistent bias. Uncertainty in simulations increased during extremes compared to reference periods.
Impacts of multiple stressors on freshwater biota across spatial scales and ecosystems
Climate and land-use change drive a suite of stressors that shape ecosystems and interact to yield complex ecological responses. This study combines data across scales from 33 mesocosm experiments with those from 14 river basins and 22 cross-basin studies in Europe, producing 174 combinations of paired-stressor effects on a biological response variable.
Nanosilver impacts on aquatic microbial decomposers and litter decomposition assessed as pollution-induced community tolerance (PICT)
The authors have shown that shifts in microbial communities triggered by chronic exposure to low concentrations of silver nanoparticles increases the community tolerance to silver, as described in the pollution-induced community tolerance (PICT) concept, with consequences for leaf litter decomposition, a pivotal process in forest streams.