A5003257653- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Soil and Water Nutrient Dynamics
- Aquatic Ecosystems and Phytoplankton Dynamics
- Heavy metals in environment
- Isotope Analysis in Ecology
- Peatlands and Wetlands Ecology
- Marine Biology and Ecology Research
- Geology and Paleoclimatology Research
- Geochemistry and Elemental Analysis
- Mine drainage and remediation techniques
- Groundwater and Isotope Geochemistry
- Water Quality and Pollution Assessment
- Fish Ecology and Management Studies
- Wastewater Treatment and Nitrogen Removal
- Ocean Acidification Effects and Responses
- Marine and environmental studies
- Coastal wetland ecosystem dynamics
- Freshwater macroinvertebrate diversity and ecology
- Air Quality Monitoring and Forecasting
- Water Quality Monitoring and Analysis
- Methane Hydrates and Related Phenomena
- Atmospheric chemistry and aerosols
- Iron oxide chemistry and applications
- Invertebrate Taxonomy and Ecology
Lund University
2015-2024
Abstract Bacteria play a central role in the cycling of carbon, yet our understanding relationship between taxonomic composition and degradation dissolved organic matter (DOM) is still poor. In this experimental study, we were able to demonstrate direct link community ecosystem functioning that differently structured aquatic bacterial communities differed their terrestrially derived DOM. Although same amount carbon was processed, both temporal pattern compounds degraded among communities....
Whole-lake additions of dissolved inorganic 13C were used to measure allochthony (the terrestrial contribution organic carbon aquatic consumers) in two unproductive lakes (Paul and Peter Lakes 2001), a nutrient-enriched lake (Peter Lake 2002), dystrophic (Tuesday 2002). Three kinds dynamic models estimate allochthony: process-rich, dual-isotope flow model based on mass balances isotopes 12 pools; simple univariate time-series driven by observed time courses δ13CO2; multivariate...
Abstract. Browning of inland waters has been noted over large parts the Northern hemisphere and is a phenomenon with both ecological societal consequences. The increase in water color generally ascribed to increasing concentrations dissolved organic matter terrestrial origin. However, oftentimes larger than that matter, implying changes concentration alone cannot explain enhanced color. Water known be affected also by quality prevalence iron. Here we investigated trends color, iron between...
Organic substrates for pelagic bacteria are derived from dissolved organic carbon (DOC) in the water column. DOC is a heterogeneous mixture of molecules, some which imported watershed (allochthonous DOC) and others that produced by autotrophs within system (autochthonous DOC). We examined importance autochthonous versus allochthonous supporting growth manipulating 13 C content sources whole‐lake experiment. NaH CO 3 was added daily to two small forested lakes period 42 d, thereby strongly...
Microbial ecology has focused much on causes of between-site variation in community composition. By analysing five data-sets each aquatic bacteria and phytoplankton, we demonstrated that microbial communities show a large degree similarity composition abundant taxa were widespread, typical pattern for many metazoan metacommunities. The regional abundance explained average 85 41% detection frequency 58 31% local abundances respectively. However, less with increasing environmental between...
Abstract Observations of increasing water color and organic carbon concentrations in lakes are widespread across the Northern Hemisphere. The drivers these trends debated. Declining atmospheric sulfur deposition has been put forward as an important underlying factor, since recovery from acidification enhances mobility matter surrounding soils. This would suggest that current browning represents a return to more natural state. study explores historical lake data Sweden—1935 2015—providing...
Abstract Understanding what controls the lateral flux of organic and inorganic carbon from landscapes to surface waters is key fully understanding terrestrial ecosystem balances, biogeochemistry freshwaters, how hydrologically‐mediated movement between these ecosystems may be altered by global change. In this paper, we synthesize current knowledge identify major gaps in our land‐to‐water fluxes dissolved particulate carbon, CO 2 , bicarbonate exploring: (1) variations soil stocks affect...
Abstract Recent reports of increasing iron (Fe) concentrations in freshwaters are concern, given the fundamental role Fe biogeochemical processes. Still, little is known about frequency and geographical distribution trends or underlying drivers. We analyzed temporal across 340 water bodies distributed over 10 countries northern Europe North America order to gain a clearer understanding where, what extent, why on rise. found that have significantly increased 28% sites, decreased 4%, with most...
Increase in surface water color (browning), caused by rising dissolved organic carbon (DOC) and iron concentrations, has been widely reported studied the last couple of decades. This phenomenon implications to aquatic ecosystem function biogeochemical cycling. While recovery from acidification changes climate-related variables, such as precipitation length growing season, are recognized drivers behind browning, land-use change received less attention. In this study, we include all above...
It has been suggested that autochthonous (internally produced) organic carbon and allochthonous (externally are utilized by phylogenetically different bacterioplankton. We examined the relationship between source of matter structure function lake bacterial communities. Differences seasonal changes in community composition two lakes differing their were followed relation to environmental variables. also performed batch culture experiments with amendments various substrates, namely fulvic...
The aim of this study was to explore how acid deposition may affect the concentration and quality dissolved organic matter (DOM) in soil–water. This done by a small-scale acidification experiment during two years where 0.5 × m2 plots were artificially irrigated with water different sulfuric content, soil–water sampled using zero-tension lysimeters under O-horizon. DOM characterized absorbance, fluorescence, size exclusion chromatography analyses. Our results showed lower mobility high...
Abstract Recent studies report trends of strongly increasing iron (Fe) concentrations in freshwaters. Since Fe is a key element with decisive role the biogeochemical cycling major elements, it important to understand mechanisms behind these trends. We hypothesized that variations concentration are driven mainly by redox dynamics hydraulically connected soils. Notably, Fe(III), which favored oxidation state except environments where microbial activity provide strong reducing intensity, has...
Summary The field of genetic diversity in protists, particularly phytoplankton, is under expansion. However, little known regarding variation within populations over time. aim our study was to investigate intrapopulation and differentiation the freshwater bloom‐forming microalga Gonyostomum semen ( Raphidophyceae ). covered a 2‐year period including all phases bloom. Amplified fragment length polymorphism (AFLP) used determine structure population. Our results showed significant between...
This study reports increasing iron concentrations in rivers draining into the Baltic Sea. Given decisive role of to structure and biogeochemical function aquatic ecosystems, this trend is likely one with far reaching consequences receiving system. What those may be depends on fate estuarine mixing. We here assess stability riverine by mixing water from seven boreal artificial sea salts. The results show a gradual loss suspension salinity. However, capacity different river waters maintain...
Abstract. Estuarine sediments are key sites for removal of phosphorus (P) from rivers and the open sea. Vivianite, an Fe(II)-P mineral, can act as a major sink P in Fe-rich coastal sediments. In this study, we investigate burial Öre Estuary northern Baltic Sea. We find much higher rates at our five study (up to ∼0.145 molm-2yr-1) when compared more southern areas Sea with similar sedimentation. Detailed sediment forms site highest rate sedimentation reveals role associated Fe presence...
Bacteria are key organisms in energy and nutrient cycles, predicting the effects of temperature change on bacterial activity is important assessing global effects. A changing situ will affect adaptation growth lake water, both long term response to change, short seasonal variations. The rate may, however, depend whether increasing or decreasing, since turnover scale with temperature. Temperature was studied for winter (in 2.5 °C) summer communities (16.5 from a temperate Southern Sweden by...
Summary 1. Aquatic ecosystems in Northern Europe are expected to face increases temperature and water colour (TB) future. While effects of these factors have been studied separately, it is unknown whether how a combination them might affect phenological events trophic interactions. 2. In mesocosm study, we combined both create conditions arise during the coming century. We focused on quantifying timing magnitude plankton spring identifying possible mismatches between resources...
Summary Thousands of lakes in the Northern Hemisphere are experiencing a continuous increase water temperature and colour. While increasing is an effect climate change, several factors suggested to drive colour, including altered land use reversed acidification. In this mesocosm study, we study effects on pelagic production sedimentation organic carbon from 3 °C temperature, doubling colour combination increased These manipulations correspond predicted development northern temperate systems...