Increased sediment deposition triggered by climate change impacts freshwater pearl mussel habitats and metapopulations
The authors investigated the influence of climate change on the river pearl mussel through a coupled, complex model cascade in the catchment area of the Aist (Austria). Discharge changes might lead to reduced sediment transport capacity and to increased fine sediment input. As a consequence the mussel's dispersal probability decreases to up to 76% of the maximum theoretical value.
Spatio-temporal variations in stable isotopes in peri-urban catchments: a preliminary assessment of potential and challenges in assessing streamflow sources
The authors used isotope tracers and water quality measurements, hydrometric and climatic data to investigate seasonal changes in water sources in the River Erpe. Downstream, flows were dominated by effluent from a large wastewater treatment plant, especially in summer. They gained new insights into how lowland, peri-urban catchments with complex land use function hydrologically.
Competition alters species’ plastic and genetic response to environmental change
The authors exposed three freshwater ciliates to long-term selection of increasing salinity in the absence and presence of competitors. Their results show that the evolutionary and plastic responses to increasing salinity depended both on interspecific competition and the magnitude of the abiotic salinity change, ultimately determining species persistence.
Integrating fundamental processes to understand eco-evolutionary community dynamics and patterns
The authors propose a framework to study eco-evo dynamics in communities by considering interactions between the processes of evolutionary biology (selection, gene flow, genetic drift and mutation) and community ecology (selection, dispersal, ecological drift and speciation). Such a framework will enable explorations of the full range of eco-evo dynamics and guide the design of novel experiments.
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.
Genomic regions associated with adaptation to predation in Daphnia often include members of expanded gene families
The authors investigated the genetic basis underpinning the adaptation of prey to predation. The expansion of multiple gene families might be a key evolutionary event for Daphnia to survive in a habitat containing predators. For example, the expansions of gene families associated with chemoreception and vision allow Daphnia to enhance detection of predation risk.
Importance of exposure route in determining nanosilver impacts on a stream detrital processing chain
The paper reports impacts of silver nanoparticles (AgNPs) and ionic silver (Ag+) on an aquatic processing chain of leaves, microbes, shredders and collectors. AgNPs and Ag+ affect multiple links of the processing chain at environmentally realistic concentrations. Shredders respond more sensitively than collectors. Leaf-associated fungal biomass and microbial leaf decomposition are being reduced.
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.
Impacts of detritivore diversity loss on instream decomposition are greatest in the tropics
The study wanted to determine whether detritivore diversity enhances leaf litter decomposition in streams and how patterns vary across realms, biomes and climates. It indicates a positive relationship between detritivore diversity and decomposition rate particularly in the tropics, whereas at higher latitudes decomposition rate was more strongly correlated with detritivore abundance and biomass.
Hydroclimatic variability and riparian wetland restoration control the hydrology and nutrient fluxes in a lowland agricultural catchment
The authors assessed the long-term (30yrs) changes in climate, discharge, groundwater levels and stream water quality in a mixed land use catchment. Climatic variability strongly influenced the catchment’s hydrology, while nutrient dynamics were primarily controlled by intrinsic solute characteristics. Riparian management was critical in modulating hydrological and nutrient variations.