A5060280169- Mercury impact and mitigation studies
- Peatlands and Wetlands Ecology
- Soil and Water Nutrient Dynamics
- Toxic Organic Pollutants Impact
- Heavy metals in environment
- Hydrology and Watershed Management Studies
- Ecology and biodiversity studies
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Botany and Plant Ecology Studies
- Marine and coastal ecosystems
- Fish Ecology and Management Studies
- Marine animal studies overview
- Integrated Water Resources Management
- Wildlife Ecology and Conservation
- Forest Management and Policy
- Data Analysis with R
- Cryospheric studies and observations
- Forest Ecology and Biodiversity Studies
- Marine and fisheries research
- Soil Geostatistics and Mapping
- Aquaculture Nutrition and Growth
- Water Treatment and Disinfection
- Groundwater and Isotope Geochemistry
- Pharmaceutical and Antibiotic Environmental Impacts
Swedish University of Agricultural Sciences
2016-2025
Pennsylvania State University
2015-2021
Umeå University
2021
This review documents recent advances in terrestrial mercury cycling. Terrestrial (Hg) research has matured some areas, and is developing rapidly others. We summarize the state of science circa 2010 as a starting point, then present during last decade three areas: land use, sulfate deposition, climate change. The are presented framework Hg “gateways” to environment: inputs from atmosphere, uptake food, runoff with surface water. Among most notable advances: Arctic emerged hotbed cycling,...
The purpose of this study was to quantify the effects clear‐cutting and site preparation on dissolved organic carbon (DOC) concentrations export in four boreal headwater streams northern Sweden. data set included intensive stream water monitoring from 2 years pretreatment conditions (2004–2005), a year post‐clear‐cut period (2006–2007), after (2008–2009). To investigate differences [DOC], an analysis variance ranks performed sets. Clear‐cutting increased median DOC significantly 15.9 20.4 mg...
Abstract The formation of the potent neurotoxic methylmercury (MeHg) is a microbially mediated process that has raised much concern because MeHg poses threats to wildlife and human health. Since boreal forest soils can be source in aquatic networks, it crucial understand biogeochemical processes involved this pollutant. High-throughput sequencing 16S rRNA mercury methyltransferase, hgcA , combined with geochemical characterisation soils, were used determine microbial populations contributing...
Inputs of anthropogenic mercury (Hg) to the environment have led accumulation Hg in terrestrial and aquatic ecosystems, contributing fish concentrations well above European Union standards large parts Fennoscandia. Forestry operations been reported increase loads surface waters by mobilizing from soil. This summary available forestry effect studies reveals considerable variation treatment effects on total (THg) methylmercury (MeHg) at different sites, varying no up manifold concentration...
Forestry operations can increase the export of mercury (both total and methyl) to surface waters. However, little is known about relative contribution different forestry practices. We address this question using a paired-catchment study that distinguishes effects site preparation from antecedent logging. Runoff water three catchments, two harvested one untreated control, was sampled biweekly during year prior logging, years after preparation. The logging alone did not significantly...
Globally, artificial river impoundment, nutrient enrichment and biodiversity loss impair freshwater ecosystem integrity. Concurrently, beavers, engineers recognized for their ability to construct dams create ponds, are colonizing sites across the Holarctic after widespread extirpation in 19th century, including areas outside historical range. This has potential profoundly alter hydrology, hydrochemistry aquatic ecology both newly colonized recolonized areas. To further our knowledge of...
Abstract Drainage for forestry has created ~ 1 million km of artificial waterways in Sweden, making it one the largest human-induced environmental disturbances country. These extensive modifications both peatland and mineral soil dominated landscapes still carry largely unknown, but potentially enormous legacy effects. However, consequences contemporary ditch management strategies, such as hydrological restoration via blocking or enhancing forest drainage to promote biomass production...
Rewetting of previously drained wetlands is a strategy to mitigate the effects climate change via increased carbon sequestration as well improve water holding capacity and biodiversity in forest landscape. The damming watercourses by beavers creates similar retention features. In both cases, inundation soils may affect mobilization mercury (Hg), subsequent production toxic bioavailable methylmercury (MeHg), due generation anoxic conditions where microbial methylators can proliferate....
The management options for historical drainage to improve forest productivity are highly politicized in many high latitude regions, often related potential climate and biodiversity values. However, important consequences of this legacy current mercury (Hg) mobilization the microbial formation methylmercury (MeHg) should also be considered. As ditches age, ditch cleaning could an option maintain growth rates. reducing capacity by rewetting peatlands a viable option, increase water holding...
Rewetting of previously drained wetlands in the forested landscape is suggested as an efficient Nature Based Solution to combat multiple environmental challenges e.g. protect biodiversity, improve water resilience, and reduce greenhouse gas emissions. In parallel with this human induced re-creation wet areas there are also non-human activities i.e. damming by beavers, that could have a similar retaining function. However, consequence these different actions on carbon exported via runoff...
Abstract Rewetting drained peatlands by raising the groundwater table is currently suggested, and widely implemented, as an efficient measure to reduce peat soil degradation decrease CO 2 emissions. However, limited information exists regarding effects of peatland rewetting on lateral carbon export (LCE) via aquatic pathway. Any changes in LCE are critical consider, they affect overall C balance, may offset any climatic benefits from rewetting. Additionally, altered could have consequences...
• Three decades of brownification in 164 Swedish watercourses were evaluated. Widespread organic carbon increases ceased 2010, color 2000. Organic many became less colored after Long-term trends must be evaluated with appropriate statistical methods. Abstract art caption: The mean estimated trend TOC concentration based on 1990–2020. matter (OM) content surface waters, as measured by and (OC), are a major issue for aquatic ecosystems. monitoring programs revealed the “brownification”,...
The Arctic environment harbors a complex mosaic of mercury (Hg) and carbon (C) reservoirs, some which are rapidly destabilizing in response to climate warming. sources riverine Hg across the Mackenzie River basin (MRB) uncertain, leads poor understanding potential future release. Measurements dissolved particulate (DHg, PHg) (DOC, POC) concentration were performed, along with analyses stable isotope ratios (incl. ∆199Hg, δ202Hg), radiocarbon content (∆14C) optical properties DOC river water....
Abstract Agricultural, forestry‐impacted and natural catchments are all vectors of nutrient loading in the Nordic countries. Here, we present concentrations fluxes total nitrogen (totN) phosphorus (totP) from 69 headwater (Denmark: 12, Finland:18, Norway:17, Sweden:22) between 2000 2018. Catchments span range climatic environmental conditions include sites impacted by agricultural forest management. Concentrations totN totP were highest catchments, intermediate lowest positively related...
The complexity of mercury (Hg) biogeochemistry has made it difficult to model surface water concentrations both total Hg (THg) and especially methylmercury (MeHg), the species having highest potential for bioaccumulation. To simulate THg MeHg variation in low-order streams, we have adapted a conceptual modeling framework where continuum lateral flows through riparian soils determines streamflow concentrations. was applied seven forest catchments located two boreal regions Sweden spanning...
Elevated concentrations of methylmercury (MeHg) in freshwater ecosystems are major environmental concern large parts the northern hemisphere. Beaver ponds have been identified as a potentially important source MeHg. The role beavers might be especially pronounced Europe, where beaver populations expanded rapidly following near-extirpation. This study evaluates age and colonization history (encompassing patterns use reuse) constructed by Eurasian Castor fiber regulating MeHg Swedish streams....
Generalized additive models are increasingly used to identify and describe environmental trends. A major advantage of these models, as compared simpler statistical tools such linear regression or Mann-Kendall tests, is that they provide estimates prevailing levels trend magnitudes at any given point in time instead an overall measure. For multiple series, this versatility has be followed by flexible visualization methods can summarize visualize analysis results for many series...
Ditch cleaning (DC) is a well-established forestry practice across Fennoscandia to lower water table levels (WTL) and thereby facilitate the establishment of tree seedlings following clear-cutting. However, implications from these activities for ecosystem-atmosphere greenhouse gas (GHG) exchanges are poorly understood at present. We assessed initial DC effects on GHG fluxes in forest clear-cut drained fertile peatland hemiboreal Sweden, by comparing chamber measurements carbon dioxide (CO2),...
Temporal trends for concentrations of mercury (Hg), lead (Pb) and cadmium (Cd) were evaluated from year 2000–2020 in 20 23 11 watercourses remote forest catchments Europe. Decreasing observed 15% 39% 45% the during period evaluation. mainly between 2000 2005 Hg 2015 Pb Cd. For last five years studied time (2015–2020), more showed significant increasing, rather than decreasing Hg, Cd trends. This was interpreted as a legacy effect metals still retained catchment soils. The overall negative...