8 research outputs found
Appendix C. Nitrogen and phosphorus dynamics after 42 days of litter exposure in a stream.
Nitrogen and phosphorus dynamics after 42 days of litter exposure in a stream
Appendix A. Leaf litter decomposition rates in coarse and fine- mesh bags.
Leaf litter decomposition rates in coarse and fine- mesh bags
Appendix A. Statistics, water nitrate concentrations, and water temperature.
Statistics, water nitrate concentrations, and water temperature
Chronic Exposure Effects of Silver Nanoparticles on Stream Microbial Decomposer Communities and Ecosystem Functions
With
the accelerated use of silver nanoparticles (AgNP) in commercial
products, streams will increasingly serve as recipients of, and repositories
for, AgNP. This raises concerns about the potential toxicity of these
nanomaterials in the environment. Here we aimed to assess the impacts
of chronic AgNP exposure on the metabolic activities and community
structure of fungal and bacterial plant litter decomposers as central
players in stream ecosystems. Minimal variation in the size and surface
charge of AgNP indicated that nanoparticles were rather stable during
the experiment. Five days of exposure to 0.05 and 0.5 μM AgNP
in microcosms shifted bacterial community structure but had no effect
on a suite of microbial metabolic activities, despite silver accumulation
in the decomposing leaf litter. After 25 days, however, a broad range
of microbial endpoints, as well as rates of litter decomposition,
were strongly affected. Declines matched with the total silver concentration
in the leaves and were accompanied by changes in fungal and bacterial
community structure. These results highlight a distinct sensitivity
of litter-associated microbial communities in streams to chronic AgNP
exposure, with effects on both microbial functions and community structure
resulting in notable ecosystem consequences through impacts on litter
decomposition and further biogeochemical processes
InvertebrateFinalLength FraineretalOikos2015
Data on invertebrate length measured at the end of the experiment, using high-quality digital photographs and software analyzer ImageJ
LitterFinalNP FraineretalOikos2015
Nitrogen and phosphorus concentration in the leaf litter at the end of the experiment
LitterMassLoss FraineretalOikos2015
Initial and final dry mass of the leaf litter
Fe Trends
The data file (FeTrends.xlxs) contains data for the 340 water bodies (headwater streams, higher-order streams, lakes and river mouths) included in the Fe trends study (Björnerås et al. 2017). The data has been collected from various monitoring programs and initiatives in 10 countries and include time series of iron (Fe), organic carbon (OC), silica (Si) and sulfate (SO4) concentrations in surface waters spanning from 1990 to 2013. Catchment variables, such as catchment size and land-use, are also included in the dataset, as well as climate data (precipitation and air temperature)