Search results for: Sara Hallin

Items from 1 to 20 out of 49 results

article

The impact of fungi on soil protist communities in European cereal croplands

Florine Degrune, Kenneth Dumack, Masahiro Ryo, Gina Garland, more

Environmental Microbiology > 26 > 7 > n/a - n/a

Protists, a crucial part of the soil food web, are increasingly acknowledged as significant influencers of nutrient cycling and plant performance in farmlands. While topographical and climatic factors are often considered to drive microbial communities on a continental scale, higher trophic levels like heterotrophic protists also rely on their food sources. In this context, bacterivores have received...

article

Plant–soil feedbacks among boreal forest species

Dora Štraus, Miguel Ángel Redondo, Carles Castaño, Jaanis Juhanson, more

Journal of Ecology > 112 > 1 > 138 - 151

Plant–microbial interactions in soils are considered to play a central role in regulating biodiversity in many global ecosystems. However, studies on plant–soil feedbacks (PSFs) and how these affect forest stand patterns in boreal regions are rare. We conducted a fully reciprocal PSF glasshouse experiment using four boreal tree species. Alnus glutinosa, Betula pendula, Picea abies and Pinus sylvestris...

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Contrasting plant–soil–microbial feedbacks stabilize vegetation types and uncouple topsoil C and N stocks across a subarctic–alpine landscape

Carles Castaño, Sara Hallin, Dagmar Egelkraut, Björn D. Lindahl, more

New Phytologist > 238 > 6 > 2621 - 2633

Global vegetation regimes vary in belowground carbon (C) and nitrogen (N) dynamics. However, disentangling large‐scale climatic controls from the effects of intrinsic plant–soil–microbial feedbacks on belowground processes is challenging. In local gradients with similar pedo‐climatic conditions, effects of plant–microbial feedbacks may be isolated from large‐scale drivers. Across a subarctic–alpine...

article

The impact of agricultural management on soil aggregation and carbon storage is regulated by climatic thresholds across a 3000 km European gradient

Anna Edlinger, Gina Garland, Samiran Banerjee, Florine Degrune, more

Global Change Biology > 29 > 11 > 3177 - 3192

Organic carbon and aggregate stability are key features of soil quality and are important to consider when evaluating the potential of agricultural soils as carbon sinks. However, we lack a comprehensive understanding of how soil organic carbon (SOC) and aggregate stability respond to agricultural management across wide environmental gradients. Here, we assessed the impact of climatic factors, soil...

article

Environmental microbiology going computational—Predictive ecology and unpredicted discoveries

Sara Hallin

Environmental Microbiology > 25 > 1 > 111 - 114

article

Disentangling the roles of plant functional diversity and plaint traits in regulating plant nitrogen accumulation and denitrification in freshwaters

Maidul I. Choudhury, Sara Hallin, Frauke Ecke, Valerie Hubalek, more

Functional Ecology > 36 > 4 > 921 - 932

There is a growing recognition that functional measures of diversity, based on quantification of functionally important species traits, are useful for explaining variation in ecosystem processes. However, the mechanisms linking functional diversity to different processes remain poorly understood, hindering development of a predictive framework for ecosystem functioning based on species traits....

article

Diversity of archaea and niche preferences among putative ammonia‐oxidizing Nitrososphaeria dominating across European arable soils

Aurélien Saghaï, Samiran Banjeree, Florine Degrune, Anna Edlinger, more

Environmental Microbiology > 24 > 1 > 341 - 356

Archaeal communities in arable soils are dominated by Nitrososphaeria, a class within Thaumarchaeota comprising all known ammonia‐oxidizing archaea (AOA). AOA are key players in the nitrogen cycle and defining their niche specialization can help predicting effects of environmental change on these communities. However, hierarchical effects of environmental filters on AOA and the delineation of niche...

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A tipping point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen

Karina Engelbrecht Clemmensen, Mikael Brandström Durling, Anders Michelsen, Sara Hallin, more

Ecology Letters > 24 > 6 > 1193 - 1204

Tundra ecosystems are global belowground sinks for atmospheric CO₂. Ongoing warming‐induced encroachment by shrubs and trees risks turning this sink into a CO₂ source, resulting in a positive feedback on climate warming. To advance mechanistic understanding of how shifts in mycorrhizal types affect long‐term carbon (C) and nitrogen (N) stocks, we studied small‐scale soil depth profiles of fungal communities...

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nir gene‐based co‐occurrence patterns reveal assembly mechanisms of soil denitrifiers in response to fire

Marta Goberna, Santiago Donat, Eduardo Pérez‐Valera, Sara Hallin, more

Environmental Microbiology > 23 > 1 > 239 - 251

Denitrification causes nitrogen losses from terrestrial ecosystems. The magnitude of nitrogen loss depends on the prevalence of denitrifiers, which show ecological differences if they harbour nirS or nirK genes encoding nitrite reductases with the same biological function. Thus, it is relevant to understand the mechanisms of co‐existence of denitrifiers, including their response to environmental filters...

article

Geospatial variation in co‐occurrence networks of nitrifying microbial guilds

Christopher M. Jones, Sara Hallin

Molecular Ecology > 28 > 2 > 293 - 306

Microbial communities transform nitrogen (N) compounds, thereby regulating the availability of N in soil. The N cycle is defined by interacting microbial functional groups, as inorganic N‐products formed in one process are the substrate in one or several other processes. The nitrification pathway is often a two‐step process in which bacterial or archaeal communities oxidize ammonia to nitrite, and...

article

Mixtures of macrophyte growth forms promote nitrogen cycling in wetlands

Maidul I. Choudhury, Brendan G. McKie, Sara Hallin, Frauke Ecke

Science of The Total Environment > 2018 > 635 > C > 1436-1443

The importance of aquatic plant diversity in regulating nutrient cycling in wetlands remains poorly understood. We investigated how variation in macrophyte growth form (emerging, submerged and bryophyte) combinations and species mixtures affect nitrogen (N) removal from the water and N accumulation in plant biomass. We conducted a wetland mesocosm experiment for 100 days during July–September 2015...

article

Expression of nirK and nirS genes in two strains of Pseudomonas stutzeri harbouring both types of NO-forming nitrite reductases

Lea Wittorf, Christopher M. Jones, Germán Bonilla-Rosso, Sara Hallin

Research in Microbiology > 2018 > 169 > 6 > 343-347

Reduction of nitrite to nitric oxide in denitrification is catalysed by two different nitrite reductases, encoded by nirS or nirK. Long considered mutually exclusive and functionally redundant in denitrifying bacteria, we show expression of both genes co-occurring in Pseudomonas stutzeri. The differential expression patterns between strain AN10 and JM300 in relation to oxygen and nitrate and their...

article

Exploiting ecosystem services in agriculture for increased food security

Riccardo Bommarco, Giulia Vico, Sara Hallin

Global Food Security > 2018 > 17 > C > 57-63

Despite contributing to economy and food security, Ecosystem Services (ES) are still not fully exploited in agriculture. Instead, external inputs have been used to boost yields, while exacting costs on public goods. Ecological intensification capitalizes on ecosystem services to enhance and stabilize production and reduce the need for external inputs, while sparing the environment. Of particular relevance...

article

Genomics and Ecology of Novel N2O-Reducing Microorganisms

Sara Hallin, Laurent Philippot, Frank E. Löffler, Robert A. Sanford, more

Trends in Microbiology > 2018 > 26 > 1 > 43-55

Microorganisms with the capacity to reduce the greenhouse gas nitrous oxide (N₂O) to harmless dinitrogen gas are receiving increased attention due to increasing N₂O emissions (and our need to mitigate climate change) and to recent discoveries of novel N₂O-reducing bacteria and archaea. The diversity of denitrifying and nondenitrifying microorganisms with capacity for N₂O reduction was recently shown...

article

Spatial and phyloecological analyses of nosZ genes underscore niche differentiation amongst terrestrial N2O reducing communities

Jaanis Juhanson, Sara Hallin, Mats Söderström, Maria Stenberg, more

Soil Biology and Biochemistry > 2017 > 115 > C > 82-91

The only known biological sink for the greenhouse gas nitrous oxide (N₂O) is its reduction to nitrogen gas (N₂) by bacteria and archaea that possess the nosZ gene conferring this trait. Phylogenetic and genomic evidence indicates that N₂O reducing communities can be divided into two genetically distinct groups, termed clade I and II. Differing abundance or diversity of each clade may have significant...

article

Intercropping affects genetic potential for inorganic nitrogen cycling by root-associated microorganisms in Medicago sativa and Dactylis glomerata

Ming Zhao, Christopher M. Jones, Johan Meijer, Per-Olof Lundquist, more

Applied Soil Ecology > 2017 > 119 > C > 260-266

The effect of intercropping on the genetic potential for N-cycle pathways promoting either retention or loss of N by the microbial communities associated to the roots or present in the bulk soil for two forage crops was studied in a greenhouse experiment. Medicago sativa (‘lucerne’) and Dactylis glomerata (‘cocksfoot’) were grown as sole crops or intercropped in soils with or without addition of biogas...

article

Soil type overrides plant effect on genetic and enzymatic N2O production potential in arable soils

Daniel R.H. Graf, Ming Zhao, Christopher M. Jones, Sara Hallin

Soil Biology and Biochemistry > 2016 > 100 > C > 125-128

Nitrous oxide (N₂O) is a potent greenhouse gas mainly produced by incomplete denitrification in agricultural soils. The rhizosphere is a hot spot for denitrification and this study aimed to discern the relative importance of soil type and crop on the genetic N₂O production and reduction potential in soil and root-associated communities in relation to denitrification activity. Based on a pot experiment...

article

Habitat partitioning of marine benthic denitrifier communities in response to oxygen availability

Lea Wittorf, Germán Bonilla‐Rosso, Christopher M. Jones, Ola Bäckman, more

Environmental Microbiology Reports > 8 > 4 > 486 - 492

Denitrification is of global significance for the marine nitrogen budget and the main process for nitrogen loss in coastal sediments. This facultative anaerobic respiratory pathway is modular in nature and the final step, the reduction of nitrous oxide (N₂O), is performed by microorganisms with a complete denitrification pathway as well as those only capable of N₂O reduction. Fluctuating oxygen availability...

article

Two‐stage anaerobic digestion for reduced hydrogen sulphide production

Jan Moestedt, Erik Nordell, Sara Hallin, Anna Schnürer

Journal of Chemical Technology & Biotechnology > 91 > 4 > 1055 - 1062

BACKGROUNDThis study evaluated a two‐stage process as an alternative to single‐stage anaerobic degradation, with the aim of separating sulphidogenesis and methanogenesis while treating a mixture of organic fraction municipal solid waste (OFMSW) and thin stillage. For full‐scale applications, no pH regulation was applied. The hydrolytic/acidogenic stage was evaluated with a hydraulic retention time...

article

Influence of genetically modified organisms on agro-ecosystem processes

Anna-Karin Kolseth, Tina D’Hertefeldt, Maren Emmerich, Flavio Forabosco, more

Agriculture, Ecosystems & Environment > 2015 > 214 > C > 96-106

Biotechnology offers extensive possibilities to incorporate new traits into organisms. Genetically modified (GM) traits relevant for agro-ecosystems include traits such as pest resistance and herbicide tolerance in crop plants, increased growth rate in fish and livestock, and enhanced nitrogen-fixation capabilities of soil microbes. In this review, we evaluated the direct and indirect trait-specific...

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INFONA - science communication portal

Search results for: Sara Hallin

The impact of fungi on soil protist communities in European cereal croplands

Plant–soil feedbacks among boreal forest species

Contrasting plant–soil–microbial feedbacks stabilize vegetation types and uncouple topsoil C and N stocks across a subarctic–alpine landscape

The impact of agricultural management on soil aggregation and carbon storage is regulated by climatic thresholds across a 3000 km European gradient

Environmental microbiology going computational—Predictive ecology and unpredicted discoveries

Disentangling the roles of plant functional diversity and plaint traits in regulating plant nitrogen accumulation and denitrification in freshwaters

Diversity of archaea and niche preferences among putative ammonia‐oxidizing Nitrososphaeria dominating across European arable soils

A tipping point in carbon storage when forest expands into tundra is related to mycorrhizal recycling of nitrogen

nir gene‐based co‐occurrence patterns reveal assembly mechanisms of soil denitrifiers in response to fire

Geospatial variation in co‐occurrence networks of nitrifying microbial guilds

Mixtures of macrophyte growth forms promote nitrogen cycling in wetlands

Expression of nirK and nirS genes in two strains of Pseudomonas stutzeri harbouring both types of NO-forming nitrite reductases

Exploiting ecosystem services in agriculture for increased food security

Genomics and Ecology of Novel N2O-Reducing Microorganisms

Spatial and phyloecological analyses of nosZ genes underscore niche differentiation amongst terrestrial N2O reducing communities

Intercropping affects genetic potential for inorganic nitrogen cycling by root-associated microorganisms in Medicago sativa and Dactylis glomerata

Soil type overrides plant effect on genetic and enzymatic N2O production potential in arable soils

Habitat partitioning of marine benthic denitrifier communities in response to oxygen availability

Two‐stage anaerobic digestion for reduced hydrogen sulphide production

Influence of genetically modified organisms on agro-ecosystem processes

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