2,040 results match your criteria biogeochemical cycles

Nutrient pollution enhances productivity and framework dissolution in algae- but not in coral-dominated reef communities.

Mar Pollut Bull 2021 May 10;168:112444. Epub 2021 May 10.

Marine Ecology, Faculty of Biology and Chemistry, University of Bremen, Bremen, Germany.

Ecosystem services provided by coral reefs may be susceptible to the combined effects of benthic species shifts and anthropogenic nutrient pollution, but related field studies are scarce. We thus investigated in situ how dissolved inorganic nutrient enrichment, maintained for two months, affected community-wide biogeochemical functions of intact coral- and degraded algae-dominated reef patches in the central Red Sea. Results from benthic chamber incubations revealed 87% increased gross productivity and a shift from net calcification to dissolution in algae-dominated communities after nutrient enrichment, but the same processes were unaffected by nutrients in neighboring coral communities. Read More

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Metagenomics and Quantitative Stable Isotope Probing Offer Insights into Metabolism of Polycyclic Aromatic Hydrocarbon Degraders in Chronically Polluted Seawater.

mSystems 2021 May 11;6(3). Epub 2021 May 11.

Department of Biological Sciences, University of Southern California, Los Angeles, California, USA

Bacterial biodegradation is a significant contributor to remineralization of polycyclic aromatic hydrocarbons (PAHs)-toxic and recalcitrant components of crude oil as well as by-products of partial combustion chronically introduced into seawater via atmospheric deposition. The Deepwater Horizon oil spill demonstrated the speed at which a seed PAH-degrading community maintained by chronic inputs responds to acute pollution. We investigated the diversity and functional potential of a similar seed community in the chronically polluted Port of Los Angeles (POLA), using stable isotope probing with naphthalene, deep-sequenced metagenomes, and carbon incorporation rate measurements at the port and in two sites in the San Pedro Channel. Read More

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Bacterial and archaeal lipids trace chemo(auto)trophy along the redoxcline in Vancouver Island fjords.

Geobiology 2021 May 7. Epub 2021 May 7.

Department of Geological Sciences and Institute of Arctic and Alpine Research (INSTAAR), University of Colorado Boulder, Boulder, CO, USA.

Marine oxygen minimum zones play a crucial role in the global oceanic carbon, nitrogen, and sulfur cycles as they harbor microbial communities that are adapted to the water column chemistry and redox zonation, and in turn control the water column chemistry and greenhouse gas release. These micro-organisms have metabolisms that rely on terminal electron acceptors other than O and often benefit from syntrophic relationships (metabolic coupling). Here, we study chemo(auto)trophy along the redoxcline in two stratified fjords on Vancouver Island (Canada) using bacterial bacteriohopanepolyols and archaeal ether lipids. Read More

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Contrasting Patterns of the Resident and Active Rhizosphere Bacterial Communities of Phragmites Australis.

Microb Ecol 2021 May 6. Epub 2021 May 6.

State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing, 210008, China.

Rhizosphere microbes play a key role in maintaining plant health and regulating biogeochemical cycles. The active bacterial community (ABC) in rhizosphere, as a small fraction of the rhizosphere resident bacterial community (RBC), has the potential to actively participate in nutrient cycling processes at the root-sediment interface. Here, we investigated the ABC and RBC within the rhizosphere of Phragmites australis (P. Read More

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Ecologically coherent population structure of uncultivated bacterioplankton.

ISME J 2021 May 5. Epub 2021 May 5.

KTH Royal Institute of Technology, Science for Life Laboratory, Department of Gene Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Stockholm, Sweden.

Bacterioplankton are main drivers of biogeochemical cycles and important components of aquatic food webs. While sequencing-based studies have revealed how bacterioplankton communities are structured in time and space, relatively little is known about intraspecies diversity patterns and their ecological relevance. Here, we use the newly developed software POGENOM (POpulation GENomics from Metagenomes) to investigate genomic diversity and differentiation in metagenome-assembled genomes from the Baltic Sea, and investigate their genomic variation using metagenome data spanning a 1700 km transect and covering seasonal variation at one station. Read More

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Particulate Metabolites and Transcripts Reflect Diel Oscillations of Microbial Activity in the Surface Ocean.

mSystems 2021 May 4;6(3). Epub 2021 May 4.

School of Oceanography, University of Washington, Seattle, Washington, USA

Light fuels photosynthesis and organic matter production by primary producers in the sunlit ocean. The quantity and quality of the organic matter produced influence community function, yet measurements of metabolites, the products of cellular metabolism, over the diel cycle are lacking. We evaluated community-level biochemical consequences of oscillations of light in the North Pacific Subtropical Gyre by quantifying 79 metabolites in particulate organic matter from 15 m every 4 h over 8 days. Read More

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The impact of microplastic-microbe interactions on animal health and biogeochemical cycles: A mini-review.

Sci Total Environ 2021 Jun 7;773:145697. Epub 2021 Feb 7.

School of Environmental Science and Engineering, Tianjin University, Tianjin 300354, PR China. Electronic address:

Microplastic (MP) pollution has attracted global attention due to the extensive use of plastic products. The hydrophobic MP surface provides a habitat for multiple microorganisms. Although there have been several studies on the impact of plastic particles on microbial communities, there are few reviews that have systematically summarized the interaction between MPs and microbes and their effects on human health and biochemical circulation. Read More

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Comparison of picoeukaryote community structures and their environmental relationships between summer and autumn in the southern Chukchi Sea.

Extremophiles 2021 May 3;25(3):235-248. Epub 2021 May 3.

Key Laboratory of Global Change and Marine-Atmospheric Chemistry, Third Institute of Oceanography, MNR, Xiamen, 361005, China.

Picoeukaryotes constitute an important component of the living biomass of oceanic communities and play major roles in biogeochemical cycles. There are very few studies on picoeukaryotes found in the Chukchi Sea. This work shows the relationship between community distribution and composition of picoeukaryotes residing in water masses and physicochemical factors in the southern Chukchi Sea studied in both midsummer (July) and early autumn (September), 2012. Read More

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Life in a Droplet: Microbial Ecology in Microscopic Surface Wetness.

Front Microbiol 2021 13;12:655459. Epub 2021 Apr 13.

Department of Plant Pathology and Microbiology, Robert H. Smith Faculty of Agriculture, Food, and Environment, Institute of Environmental Sciences, Hebrew University, Rehovot, Israel.

While many natural and artificial surfaces may appear dry, they are in fact covered by thin liquid films and microdroplets invisible to the naked eye known as microscopic surface wetness (MSW). Central to the formation and the retention of MSW are the deliquescent properties of hygroscopic salts that prevent complete drying of wet surfaces or that drive the absorption of water until dissolution when the relative humidity is above a salt-specific level. As salts are ubiquitous, MSW occurs in many microbial habitats, such as soil, rocks, plant leaf, and root surfaces, the built environment, and human and animal skin. Read More

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Comparing Sediment Microbiomes in Contaminated and Pristine Wetlands along the Coast of Yucatan.

Microorganisms 2021 Apr 20;9(4). Epub 2021 Apr 20.

UMDI-Sisal, Facultad de Ciencias, Universidad Nacional Autónoma de México, Parque Científico y Tecnológico de Yucatán, Sierra Papacal-Chuburna Km 5, Mérida, Yucatán 97302, Mexico.

Microbial communities are important players in coastal sediments for the functioning of the ecosystem and the regulation of biogeochemical cycles. They also have great potential as indicators of environmental perturbations. To assess how microbial communities can change their composition and abundance along coastal areas, we analyzed the composition of the microbiome of four locations of the Yucatan Peninsula using 16S rRNA gene amplicon sequencing. Read More

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CAZymes in 62-1 From the Patagonian Shelf: Genomics and Physiology Compared to Related Flavobacteria and a Co-occurring Strain.

Front Microbiol 2021 12;12:628055. Epub 2021 Apr 12.

Institute for Chemistry and Biology of the Marine Environment, Oldenburg, Germany.

Carbohydrate-active enzymes (CAZymes) are an important feature of bacteria in productive marine systems such as continental shelves, where phytoplankton and macroalgae produce diverse polysaccharides. We herein describe 62-1, a novel strain of this flavobacterial species, isolated from alginate-supplemented seawater collected at the Patagonian continental shelf. 62-1 harbors a diverse array of CAZymes in multiple polysaccharide utilization loci (PUL). Read More

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Thermal niches of planktonic foraminifera are static throughout glacial-interglacial climate change.

Proc Natl Acad Sci U S A 2021 May;118(18)

Department of Earth Sciences, University of Oxford, OX1 3AN Oxford, United Kingdom,

Abiotic niche lability reduces extinction risk by allowing species to adapt to changing environmental conditions in situ. In contrast, species with static niches must keep pace with the velocity of climate change as they track suitable habitat. The rate and frequency of niche lability have been studied on human timescales (months to decades) and geological timescales (millions of years), but lability on intermediate timescales (millennia) remains largely uninvestigated. Read More

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Soil enzymatic activity data over eight years at the EFELE site, a long-term field experiment on effects of organic waste products and tillage practices.

Data Brief 2021 Jun 18;36:106959. Epub 2021 Mar 18.

UMR SAS, Institut Agro, INRAE, 35000 Rennes, France.

Land application of organic waste products (OWPs), catch crops and reduced soil tillage are accepted as sustainable management practices in agriculture. They can optimize resources by supplying nutrients to plants and helping to maintain soil fertility. They also can influence soil functions in agricultural production systems. Read More

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Rock-Hosted Subsurface Biofilms: Mineral Selectivity Drives Hotspots for Intraterrestrial Life.

Front Microbiol 2021 9;12:658988. Epub 2021 Apr 9.

Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL, United States.

The continental deep subsurface is likely the largest reservoir of biofilm-based microbial biomass on Earth, but the role of mineral selectivity in regulating its distribution and diversity is unclear. Minerals can produce hotspots for intraterrestrial life by locally enhancing biofilm biomass. Metabolic transformations of minerals by subsurface biofilms may occur widely with the potential to significantly impact subsurface biogeochemical cycles. Read More

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Correspondence between DOM molecules and microbial community in a subtropical coastal estuary on a spatiotemporal scale.

Environ Int 2021 Apr 23;154:106558. Epub 2021 Apr 23.

State Key Laboratory for Marine Environmental Science, Institute of Marine Microbes and Ecospheres, College of Ocean and Earth Sciences, Xiamen University, Xiang'an Campus, Xiang'an South Road, Xiamen 361102, China; Fujian Key Laboratory of Marine Carbon Sequestration, Xiamen University, Xiang'an Campus, Xiang'an South Road, Xiamen 361102, China. Electronic address:

Dissolved organic matter (DOM) changes in quantity and quality over time and space, especially in highly dynamic coastal estuaries. Bacterioplankton usually display seasonal and spatial variations in abundance and composition in the coastal regions, and influence the DOM pool via assimilation, transformation and release of organic molecules. The change in DOM can also affect the composition of bacterial community. Read More

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A total of 219 metagenome-assembled genomes of microorganisms from Icelandic marine waters.

PeerJ 2021 2;9:e11112. Epub 2021 Apr 2.

School of Health Sciences, University of Iceland, Reykjavik, Iceland.

Marine microorganisms contribute to the health of the global ocean by supporting the marine food web and regulating biogeochemical cycles. Assessing marine microbial diversity is a crucial step towards understanding the global ocean. The waters surrounding Iceland are a complex environment where relatively warm salty waters from the Atlantic cool down and sink down to the deep. Read More

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Novel Microbial Groups Drive Productivity in an Archean Iron Formation.

Front Microbiol 2021 30;12:627595. Epub 2021 Mar 30.

Department of Earth and Environmental Sciences, University of Minnesota Twin Cities, Minneapolis, MN, United States.

Deep subsurface environments are decoupled from Earth's surface processes yet diverse, active, and abundant microbial communities thrive in these isolated environments. Microbes inhabiting the deep biosphere face unique challenges such as electron donor/acceptor limitations, pore space/fracture network limitations, and isolation from other microbes within the formation. Of the few systems that have been characterized, it is apparent that nutrient limitations likely facilitate diverse microbe-microbe interactions (i. Read More

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Effect of East Asian atmospheric particulate matter deposition on bacterial activity and community structure in the oligotrophic Northwest Pacific.

Environ Pollut 2021 Apr 5;283:117088. Epub 2021 Apr 5.

College of Marine Life Sciences, Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, Qingdao, 266003, China; Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, 266003, China.

Large amounts of anthropogenic East Asian (EA) particulate matters (PM), containing inorganic nutrients and organic matter, are deposited in the oligotrophic Northwest Pacific Ocean. However, the effects of such deposition on marine microbes remain unclear. In this study, the effect of EA PM deposition on marine bacteria was assessed by five on-board microcosm experiments, conducted in oligotrophic basins of the South China Sea. Read More

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Changes in the nitrogen footprint of green tea consumption in Japan from 1965 to 2016.

Environ Sci Pollut Res Int 2021 Apr 14. Epub 2021 Apr 14.

Division of Biogeochemical Cycles, Institute for Agro-Environmental Sciences, NARO, 3-1-3 Kannondai, Tsukuba, Ibaraki, 305-8604, Japan.

Heavy application of nitrogen (N) in tea (Camellia sinensis (L.)) plantations causes various environmental problems. To date, studies on N flows have been limited to the tea plantation level, but the crucial drivers of N flows are consumers, not farmers. Read More

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Constraining the atmospheric limb of the plastic cycle.

Proc Natl Acad Sci U S A 2021 Apr;118(16)

Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 92093.

Plastic pollution is one of the most pressing environmental and social issues of the 21st century. Recent work has highlighted the atmosphere's role in transporting microplastics to remote locations [S. Allen et al. Read More

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Not just a methane source: Amazonian floodplain sediments harbour a high diversity of methanotrophs with different metabolic capabilities.

Mol Ecol 2021 Apr 4. Epub 2021 Apr 4.

Cell and Molecular Biology Laboratory, Center for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, Brazil.

The Amazonian floodplain forests are dynamic ecosystems of great importance for the regional hydrological and biogeochemical cycles and function as a significant CH source contributing to the global carbon balance. Unique geochemical factors may drive the microbial community composition and, consequently, affect CH emissions across floodplain areas. Here, we report the in situ composition of CH cycling microbial communities in Amazonian floodplain sediments. Read More

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How sediment bacterial community shifts along the urban river located in mining city.

Environ Sci Pollut Res Int 2021 Apr 3. Epub 2021 Apr 3.

Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, No.1 Xikang Road, Nanjing, 210098, China.

Bacterial communities play critical roles in biogeochemical cycles and serve as sensitive indicators of environmental fluctuation. However, the influence of mineral resource exploitation on shaping the bacterial communities in the urban river is still ambiguous. In this study, high-throughput sequencing was used to determine the spatial distribution of the sediment bacterial communities along an urban river in the famous mining city Panzhihua of China. Read More

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Influence of Temperature and Sulfate Concentration on the Sulfate/Sulfite Reduction Prokaryotic Communities in the Tibetan Hot Springs.

Microorganisms 2021 Mar 12;9(3). Epub 2021 Mar 12.

State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China.

The distribution and diversity of sulfate/sulfite reduction prokaryotic (SRP) communities in hot springs from the Quzhuomu and Daggyai Geothermal Zone of Tibetan, China, was reported for the first time. In hot springs that are naturally hyperthermal and anoxic, the sulfur cycle is one of the most active cycles of the elements. The distribution of SRP in response to temperature is of great importance to the understanding of biogeochemical cycling of sulfur in geothermal features. Read More

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Disproportionate CH Sink Strength from an Endemic, Sub-Alpine Australian Soil Microbial Community.

Microorganisms 2021 Mar 15;9(3). Epub 2021 Mar 15.

Centre for Carbon Water and Food, Sydney Institute of Agriculture, University of Sydney, Brownlow Hill 2570, Australia.

Soil-to-atmosphere methane (CH) fluxes are dependent on opposing microbial processes of production and consumption. Here we use a soil-vegetation gradient in an Australian sub-alpine ecosystem to examine links between composition of soil microbial communities, and the fluxes of greenhouse gases they regulate. For each soil/vegetation type (forest, grassland, and bog), we measured carbon dioxide (CO) and CH fluxes and their production/consumption at 5 cm intervals to a depth of 30 cm. Read More

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Soil Biogeochemical Cycle Couplings Inferred from a Function-Taxon Network.

Research (Wash D C) 2021 10;2021:7102769. Epub 2021 Mar 10.

Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.

Soil biogeochemical cycles and their interconnections play a critical role in regulating functions and services of environmental systems. However, the coupling of soil biogeochemical processes with their mediating microbes remains poorly understood. Here, we identified key microbial taxa regulating soil biogeochemical processes by exploring biomarker genes and taxa of contigs assembled from metagenomes of forest soils collected along a latitudinal transect (18° N to 48° N) in eastern China. Read More

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Sensitivity of the mangrove-estuarine microbial community to aquaculture effluent.

iScience 2021 Mar 18;24(3):102204. Epub 2021 Feb 18.

Scripps Institution of Oceanography, UC San Diego, 8622 Kennel Way, La Jolla, CA 92037, USA.

Mangrove-dominated estuaries host a diverse microbial assemblage that facilitates nutrient and carbon conversions and could play a vital role in maintaining ecosystem health. In this study, we used 16S rRNA gene analysis, metabolic inference, nutrient concentrations, and δC and δN isotopes to evaluate the impact of land use change on near-shore biogeochemical cycles and microbial community structures within mangrove-dominated estuaries. Samples in close proximity to active shrimp aquaculture were high in NH, NO NO, and PO; lower in microbial community and metabolic diversity; and dominated by putative nitrifiers, denitrifies, and sulfur-oxidizing bacteria. Read More

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Casting Light on the Adaptation Mechanisms and Evolutionary History of the Widespread Sumerlaeota.

mBio 2021 03 30;12(2). Epub 2021 Mar 30.

State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, China

Sumerlaeota is a mysterious, putative phylum-level lineage distributed globally but rarely reported. As such, their physiology, ecology, and evolutionary history remain unknown. The 16S rRNA gene survey reveals that Sumerlaeota is frequently detected in diverse environments globally, especially cold arid desert soils and deep-sea basin surface sediments, where it is one dominant microbial group. Read More

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Microplastic effects on carbon cycling processes in soils.

PLoS Biol 2021 Mar 30;19(3):e3001130. Epub 2021 Mar 30.

Soil and Crop Sciences, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York, United States of America.

Microplastics (MPs), plastic particles <5 mm, are found in environments, including terrestrial ecosystems, planetwide. Most research so far has focused on ecotoxicology, examining effects on performance of soil biota in controlled settings. As research pivots to a more ecosystem and global change perspective, questions about soil-borne biogeochemical cycles become important. Read More

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The fate of plastic litter within estuarine compartments: An overview of current knowledge for the transboundary issue to guide future assessments.

Environ Pollut 2021 Jun 15;279:116908. Epub 2021 Mar 15.

Laboratório de Microcontaminantes Orgânicos e Ecotoxicologia Aquática - Instituto de Oceanografia - Universidade Federal do Rio Grande (FURG). Av. Itália, Km 8, Carreiros, CEP: 96203-900, Rio Grande, RS, Brazil.

Plastics can enter biogeochemical cycles and thus be found in most ecosystems. Most studies emphasize plastic pollution in oceanic ecosystems even though rivers and estuaries are acknowledged as the main sources of plastics to the oceans. This review detected few studies approaching the transboundary issue, as well as patterns of estuarine gradients in predicting plastic distribution and accumulation in water, sediments, and organisms. Read More

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Opportunistic bacteria with reduced genomes are effective competitors for organic nitrogen compounds in coastal dinoflagellate blooms.

Microbiome 2021 03 24;9(1):71. Epub 2021 Mar 24.

State Key Laboratory of Marine Environmental Science, Fujian Key Laboratory of Marine Carbon Sequestration, College of Ocean and Earth Sciences, Xiamen University, Xiamen, 361102, People's Republic of China.

Background: Phytoplankton blooms are frequent events in coastal areas and increase the production of organic matter that initially shapes the growth of opportunistic heterotrophic bacteria. However, it is unclear how these opportunists are involved in the transformation of dissolved organic matter (DOM) when blooms occur and the subsequent impacts on biogeochemical cycles.

Results: We used a combination of genomic, proteomic, and metabolomic approaches to study bacterial diversity, genome traits, and metabolic responses to assess the source and lability of DOM in a spring coastal bloom of Akashiwo sanguinea. Read More

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