A5033405807- Peatlands and Wetlands Ecology
- Methane Hydrates and Related Phenomena
- Microbial Community Ecology and Physiology
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Coastal wetland ecosystem dynamics
- Cryospheric studies and observations
- Genomics and Phylogenetic Studies
- Microbial metabolism and enzyme function
- Soil Carbon and Nitrogen Dynamics
- Polar Research and Ecology
- Indigenous Studies and Ecology
- Fire effects on ecosystems
- Gut microbiota and health
- Plant Water Relations and Carbon Dynamics
- Atmospheric chemistry and aerosols
- Geology and Paleoclimatology Research
- Electrohydrodynamics and Fluid Dynamics
- Lichen and fungal ecology
- Wastewater Treatment and Nitrogen Removal
- Marine and coastal ecosystems
- Constructed Wetlands for Wastewater Treatment
- Legume Nitrogen Fixing Symbiosis
- Fluid Dynamics and Heat Transfer
- Epigenetics and DNA Methylation
University of Eastern Finland
2015-2025
University of Helsinki
2024
University of Vienna
2019-2023
Finland University
2009-2020
Finnish Environment Institute
2010-2012
Microorganisms are vital in mediating the earth's biogeochemical cycles; yet, despite our rapidly increasing ability to explore complex environmental microbial communities, relationship between community structure and ecosystem processes remains poorly understood. Here, we address a fundamental unanswered question ecology: 'When do need understand accurately predict function?' We present statistical analysis investigating value of data independently combination for explaining rates carbon...
Abstract In contrast to the well-recognized permafrost carbon (C) feedback climate change, fate of nitrogen (N) after thaw is poorly understood. According mounting evidence, part N liberated from may be released atmosphere as strong greenhouse gas (GHG) nitrous oxide (N 2 O). Here, we report post-thaw O release late Pleistocene deposits called Yedoma, which store a substantial C and are highly vulnerable thaw. While freshly thawed, unvegetated Yedoma in disturbed areas emit little O,...
Summary Methane (CH 4 ) exchange in tree stems and canopies the processes involved are among least understood components of global CH cycle. Recent studies have focused on quantifying as sources understanding abiotic emissions plant canopies, with role microbial situ formation receiving less attention. Moreover, despite initial reports revealing consumption, not adequately evaluated potential oxidation within trees. In this paper, we discuss current level these processes. Further,...
Tropical scleractinian corals support a diverse assemblage of microbial symbionts. This 'microbiome' possesses the requisite functional diversity to conduct range nitrogen (N) transformations including denitrification, nitrification, fixation and dissimilatory nitrate reduction ammonium (DNRA). Very little direct evidence has been presented date verifying that these processes are active within tropical corals. Here we use combination stable isotope techniques, nutrient uptake calculations...
In lake ecosystems a major proportion of methane (CH4) emissions originate from the littoral zone, which can have great spatial variability in hydrology, soil quality and vegetation. Hitherto, heterogeneity effects it has on functioning diversity methanotrophs wetlands been poorly understood. A diagnostic microarray based particulate monooxygenase gene coupled with geostatistics was used to analyse patterns wetland eutrophic boreal (Lake Kevätön, Eastern Finland). The had hydrology gradient...
Sphagnum-associated methanotrophs (SAM) are an important sink for the methane (CH4) formed in boreal peatlands. We aimed to reveal how peatland succession, which entails a directional change several environmental variables, affects SAM and their activity. Based on pmoA microarray results, community structure changes when develops from minerotrophic fen ombrotrophic bog. Methanotroph subtypes Ia, Ib, II showed slightly contrasting patterns during suggesting differences ecological niche...
Abstract Nitrous acid (HONO) photolysis produces hydroxyl radicals—a key atmospheric oxidant. Soils are strong HONO emitters, yet production pathways in soils and their relative contributions poorly constrained. Here, we conduct 15 N tracer experiments isotope pool dilution assays on two types of agricultural Finland to determine emission fluxes pathways. We show that microbial processes more important than abiotic for emissions. Microbial nitrate reduction (denitrification) considerably...
ABSTRACT Permafrost microbial research has flourished in the past decades, due part to improvements sampling and molecular techniques, but also increased focus on permafrost greenhouse gas feedback climate change other ecological processes high latitude alpine soils. microorganisms are adapted these extreme environments remain active at low temperatures when resources limited. They an important component of global elemental cycles as they regulate organic matter turnover production,...
Boreal forests play a crucial role in emitting biogenic volatile organic compounds (BVOCs), which have both warming and cooling effects on the Earth's climate. These are among primary sources of secondary aerosols (SOAs). Plant-emitted BVOCs, such as isoprenoids (including isoprene, monoterpenes, sesquiterpenes), serve precursors to SOAs, significantly affecting air quality Recent research indicates that forest fires also long-term impacts BVOC emissions, influenced by frequency severity...
Nitrous oxide (N₂O) is a critical greenhouse gas, ranking third in prevalence and serving as the leading contributor to ozone depletion twenty-first century. Its global warming potential 298 times higher than that of carbon dioxide (CO₂) over 100-year timeframe. Current estimates suggest N₂O emissions range from 8.1 30.7 teragrams (Tg) per year. Alarmingly, about two-thirds these stem natural terrestrial sources, mainly related microbial processes soils. While...
Microbes are the key players in global cycling of nitrogen (N) and carbon (C), controlling availability fluxes C N ecosystems, as well being responsible for losses through emissions powerful greenhouse gasses nitrous oxide (N2O) methane (CH4). Thus, characterization microbial functional guilds involved these processes is high on scientific agenda. Yet, standard sequence-based methods often reveal only a minor fraction their diversity nature due to frequent low relative abundance,...
The gene encoding stilbene synthase is frequently used to modify plant secondary metabolism with the aim of producing self-defence phytoalexin resveratrol. In this study, strawberry (Fragaria×ananassa) was transformed NS-Vitis3 from frost grape (Vitis riparia) under control cauliflower mosaic virus 35S and floral filament-specific fil1 promoters. Changes in leaf metabolites were investigated UPLC-qTOF-MS (ultra performance liquid chromatography-quadrupole time flight mass spectrometry)...
It is known that Sphagnum associated methanotrophy (SAM) changes in relation to the peatland water table (WT) level. After drought, rising WT able reactivate SAM. We aimed reveal whether this reactivation due activation of indigenous methane (CH(4)) oxidizing bacteria (MOB) already present mosses or MOB water. This was tested through two approaches: a transplantation experiment, Sphagna lacking SAM activity were transplanted into flark next CH(4). Already after 3 days, most transplants...
A total of 50 Finnish bathing water samples and 34 sewage effluent originating from 17 locations were studied in the summers 2006 2007. Campylobacter present 58% adenoviruses 12% all samples; 53% positive for spp. 59% adenoviruses. C. jejuni was most common species found human adenovirus serotype 41 identified type. Bathing temperature displayed a significant negative relationship with occurrence Campylobacter. One location had identical pulsed-field gel electrophoresis patterns coli...
Littoral wetlands are responsible for most of the total methane (CH(4) ) emissions from lake ecosystems. We show that seasonally variable hydrological and temperature conditions in littoral wetland a eutrophic boreal affect community composition gene transcription methanotrophs measured by particulate monooxygenase (pmoA) gene-targeted microarray. Type Ib freshwater-cluster were favoured high water level, CH(4) oxidation was positively correlated with their pmoA transcripts. In dry subsite...
Methane emissions from plant foliage may play an important role in the global methane cycle, but their size and underlying source processes remain poorly understood. Here, we quantify fluxes shoots of Scots pine trees, a dominant tree species boreal forests, to identify environmental drivers, evaluate whether these can be constrained at ecosystem-level by eddy covariance flux measurements. We show that shoot-level measurements conducted forest, garden, or greenhouse settings; on mature trees...
ABSTRACT With the advent of molecular biological techniques, especially next-generation sequencing and metagenomics, number microbial biogeography studies is rapidly increasing. However, these involve synthesis data generated by different laboratories using protocols, chemicals, etc., all with inherent biases. The aim this study was to assess inter- as well intralaboratory variations in community composition when standardized protocols are applied a single soil sample. Aliquots from...
Abstract Soils are important sources of nitric oxide (NO) and nitrous acid (HONO) in the atmosphere. These nitrogen (N)-containing gases play a crucial role atmospheric chemistry climate at different scales because reactions modulated by NO hydroxyl radicals (OH), which formed via HONO photolysis. Northern permafrost soils have so far remained unexplored for emissions despite their high N stocks, capacity to emit (N 2 O), enhancing mineral turnover due warming thawing. Here, we report first...