1,721 results match your criteria ecosystems systematically

Linking a Gene Cluster to Atranorin, a Major Cortical Substance of Lichens, through Genetic Dereplication and Heterologous Expression.

mBio 2021 Jun 22:e0111121. Epub 2021 Jun 22.

Korean Lichen Research Institute, Sunchon National Universitygrid.412871.9, Suncheon, South Korea.

The depside and depsidone series compounds of polyketide origin accumulate in the cortical or medullary layers of lichen thalli. Despite the taxonomic and ecological significance of lichen chemistry and its pharmaceutical potentials, there has been no single piece of genetic evidence linking biosynthetic genes to lichen substances. Thus, we systematically analyzed lichen polyketide synthases (PKSs) for categorization and identification of the biosynthetic gene cluster (BGC) involved in depside/depsidone production. Read More

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Transport and deposition of microplastic particles in saturated porous media: Co-effects of clay particles and natural organic matter.

Environ Pollut 2021 Jun 15;287:117585. Epub 2021 Jun 15.

The Key Laboratory of Water and Sediment Sciences, Ministry of Education, State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, PR China. Electronic address:

Natural colloids such as clays and natural organic matter (NOM) are universally present in environments, which could interact with microplastics (MPs) and thus alter the fate and transport of MPs in porous media. The co-effects of clays and NOM on MPs transport in saturated porous media were systematically explored at both low and high ionic strength (IS) conditions. Specifically, bentonite and humic acid (HA) were employed as representative clays and NOM. Read More

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Data mining for evaluating the ecological compensation, static and dynamic benefits of returning farmland to forest.

Yi Sun Hua Li

Environ Res 2021 Jun 16;201:111524. Epub 2021 Jun 16.

Northwest A&F University, Yangling, 712100, Shaanxi, China. Electronic address:

Based on data mining technology, this paper incorporates Bayesian networks to examine ecosystem data in order to investigate the static and dynamic benefits of returning farmland to forests and ecological compensation. The restricted network structure is suggested to reduce training costs and simplify model structure. Simultaneously, in order to increase prediction accuracy over a single model, ensemble learning is utilized to train multiple models to solve the same problem. Read More

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Drivers of diversity and community structure of bees in an agroecological region of Zimbabwe.

Ecol Evol 2021 Jun 1;11(11):6415-6426. Epub 2021 May 1.

Department of Crop science and Post-Harvest Technology Chinhoyi University of Technology Chinhoyi Zimbabwe.

Worldwide bees provide an important ecosystem service of plant pollination. Climate change and land-use changes are among drivers threatening bee survival with mounting evidence of species decline and extinction. In developing countries, rural areas constitute a significant proportion of the country's land, but information is lacking on how different habitat types and weather patterns in these areas influence bee populations. Read More

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Simultaneous removal of Zn and p-nitrophenol from wastewater using nanocomposites of montmorillonite with alkyl-ammonium and complexant.

Environ Res 2021 Jun 15;201:111496. Epub 2021 Jun 15.

Department of Ecosystem Science and Management and Materials Research Institute, 204EEL, The Pennsylvania State University, University Park, PA, 16802, USA. Electronic address:

Three types of alkyl-ammonium with different branching chains and three complexants with different functional groups were used to prepare alkyl-ammonium or complexant intercalated montmorillonite nanocomposite (A-Mt or C-Mt). In addition, synergistic intercalated montmorillonite nanocomposites (A/C-Mt) with alkyl-ammonium along with complexant were also prepared. The adsorption performance of the various nanocomposites toward Zn and p-nitrophenol (PNP) from simulated binary wastewater containing both Zn and PNP were systematically investigated. Read More

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Large-scale reptile extinctions following European colonization of the Guadeloupe Islands.

Sci Adv 2021 May 19;7(21). Epub 2021 May 19.

Max Planck Institute for the Science of Human History, Kahlaische Straße 10, D-07745 Jena, Germany.

Large-scale extinction is one of the defining challenges of our time, as human processes fundamentally and irreversibly reshape global ecosystems. While the extinction of large animals with popular appeal garners widespread public and research interest, the importance of smaller, less "charismatic" species to ecosystem health is increasingly recognized. Benefitting from systematically collected fossil and archaeological archives, we examined snake and lizard extinctions in the Guadeloupe Islands of the Caribbean. Read More

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Woody species distribution across a savanna-dry forest soil gradient in the Brazilian Cerrado.

Braz J Biol 2021 14;83:e243245. Epub 2021 Jun 14.

Universidade Federal de Lavras - UFLA, Departamento de Ecologia e Conservação, Lavras, MG, Brasil.

Although richness and distribution of woody species in the Cerrado physiognomies have been extensively studied, the shifts of woody species from savanna physiognomies to dry forests have not yet been addressed. Here, we investigate the effect of soil physical-chemical traits on the woody species turnover between adjacent cerrado stricto sensu and dry forest physiognomies. Woody species were surveyed, and soil and topographic variables measured, in 30 10×40 m plots systematically distributed, with 15 plots in each physiognomy. Read More

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Effect of organic loading on phosphorus forms transformation and microbial community in continuous-flow A/O process.

Water Sci Technol 2021 Jun;83(11):2640-2651

Tianjin IKWEN Water Treatment Co., Ltd, Tianjin 300000, China.

A continuous-flow Anaerobic/Anoxic/Oxic (A/O) system was operated at different organic concentrations to systematically investigate the effect on the nutrient removal, secretion characteristics of extracellular polymer, phosphorus forms transformation and changes in functional flora in this system. The results showed that high organic loading was more conducive to promote the secretion of extracellular polymeric substance (EPS), the increase of polysaccharide content was more obvious compared with protein, the impact of organic loading on the components of loosely bound EPS (LB-EPS) was higher than that of tight-bound EPS (TB-EPS). Phosphorus in sludge floc mainly existed in the form of inorganic phosphorus (IP), and IP mainly existed in the form of apatite inorganic phosphorus (AP). Read More

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High time-resolved characterization of airborne microbial community during a typical haze pollution process.

J Hazard Mater 2021 08 24;415:125722. Epub 2021 Mar 24.

School of Water and Environment, Chang'an University, Xi'an 710054, China; Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region (Chang'an University), Ministry of Education, Xi'an 710054, China. Electronic address:

Variations of bioaerosol characteristics during the process of haze pollution have rarely been explored. In this study, high time-resolved variations of the community structures of bacteria, fungi, and ammonia-oxidizing microorganisms (AOMs) were assessed during a typical haze pollution process. The impacts of meteorological factors, water-soluble inorganic ions (WSII), and organic dicarboxylic acids (DCA) on the airborne microbial community were systematically evaluated. Read More

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A roadmap towards quantitative cumulative impact assessments: Every step of the way.

Sci Total Environ 2021 Aug 20;784:146847. Epub 2021 Apr 20.

Wageningen University and Research, Wageningen Marine Research, P.O. Box 57, 1780 AB Den Helder, the Netherlands.

Currently most Cumulative Impacts Assessments (CIAs) are risk-based approaches that assess the potential impact of human activities and their pressures on the ecosystem thereby compromising the achievement of policy objectives. While some of these CIAs apply actual data (usually spatial distributions) they often have to rely on categorical scores based on expert judgement if they actually assess impact which is often expressed as a relative measure that is difficult to interpret in absolute terms. Here we present a first step-wise approach to conduct a fully quantitative CIA based on the selection and subsequent application of the best information available. Read More

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Enhanced adsorption of polystyrene nanoplastics (PSNPs) onto oxidized corncob biochar with high pyrolysis temperature.

Sci Total Environ 2021 Aug 16;784:147115. Epub 2021 Apr 16.

College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, PR China; College of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, PR China.

Plastic pollution has become a global threat in the natural environment, and an urgent remedial measure is needed to reduce the negative effects caused by plastic pollutants. In the current study, the effects of pyrolysis temperature (500 °C, 700 °C, and 900 °C) and aging on the adsorption of polystyrene nanoplastics (PSNPs) onto corncob biochar were systematically assessed with kinetic, isotherm, pH-dependent adsorption experiments, FTIR and XPS spectroscopy, and DLVO calculations. The oxidation was done with 5% of HNO/HSO to simulate long-term oxidative aging of biochar in the environment. Read More

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Fish species richness in the Terminos Lagoon: An occurrence data compilation of four sampling campaigns along a multidecadal series.

Biodivers Data J 2021 21;9:e65317. Epub 2021 May 21.

Instituto de Ecologia, Pesquerias y Oceanografia del Golfo de Mexico, Universidad Autonoma de Campeche (EPOMEX-UAC), Campus VI, 24029 San Francisco de Campeche, Campeche, Mexico Instituto de Ecologia, Pesquerias y Oceanografia del Golfo de Mexico, Universidad Autonoma de Campeche (EPOMEX-UAC) Campus VI, 24029 San Francisco de Campeche, Campeche Mexico.

Background: Here we present an occurrence dataset that contributes to the knowledge of tropical fish distribution in coastal habitats from the Terminos Lagoon Flora and Fauna Protection Area, one of the largest lagoon ecosystems in the Gulf of Mexico. Fish are high biomass keystone species in the Terminos Lagoon which provide socio-economic and ecosystem services. An initiative in 1980 was carried out to systematically sample the fish community of Terminos Lagoon for an annual cycle; the effectiveness of its results led to replicate in the lagoon the same sampling design for three more campaigns in 1998, 2010 and 2016. Read More

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Marine litter on the seafloors of the Bohai Sea, Yellow Sea and northern East China Sea.

Mar Pollut Bull 2021 May 31;169:112516. Epub 2021 May 31.

Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Shandong Provincial Key Laboratory of Fishery Resources and Ecological Environment, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, China; Function Laboratory for Marine Fisheries Science and Food Production Processes, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, China; National Field Observation and Research Center for Changdao Marine Ecosystem, Changdao, China.

Seafloor litter was investigated in the Bohai Sea, Yellow Sea, and northern East China Sea (BYnECS) based on fisheries-independent bottom trawl surveys in 2019. The mean density of seafloor litter was 48.44 items∙km (44. Read More

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Characterizing Smart Environments as Interactive and Collective Platforms: A Review of the Key Behaviors of Responsive Architecture.

Sensors (Basel) 2021 May 14;21(10). Epub 2021 May 14.

School of Architecture, Hanyang University, Seoul 04763, Korea.

Since architect Nicholas Negroponte first proposed a vision of responsive architecture smart environments have been widely investigated, especially in the fields of computer science and engineering. Despite growing interest in the topic, a comprehensive review of research about smart environments from the architectural perspective is largely missing. In order to provide a formal understanding of smart environments in architecture, this paper conducts a systematic literature review of scholarly sources over the last decade, focusing on four related subjects: (1) responsive architecture, (2) kinetic architecture, (3) adaptive architecture and (4) intelligent buildings. Read More

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Testing the Contribution of Multi-Source Remote Sensing Features for Random Forest Classification of the Greater Amanzule Tropical Peatland.

Sensors (Basel) 2021 May 13;21(10). Epub 2021 May 13.

Hen Mpoano (Our Coast), Takoradi WS-289-9503, Ghana.

Tropical peatlands such as Ghana's Greater Amanzule peatland are highly valuable ecosystems and under great pressure from anthropogenic land use activities. Accurate measurement of their occurrence and extent is required to facilitate sustainable management. A key challenge, however, is the high cloud cover in the tropics that limits optical remote sensing data acquisition. Read More

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Systematic screening of viral and human genetic variation identifies antiretroviral resistance and immune escape link.

Elife 2021 Jun 1;10. Epub 2021 Jun 1.

Division of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.

Background: Considering the remaining threat of drug-resistantmutations (DRMs) to antiretroviral treatment (ART) efficacy, we investigated how the selective pressure of human leukocyte antigen (HLA)-restricted cytotoxic T lymphocytes drives certain DRMs' emergence and retention.

Methods: We systematically screened DRM:HLA class I allele combinations in 3997 ART-naïve Swiss HIV Cohort Study (SHCS) patients. For each pair, a logistic regression model preliminarily tested for an association with the DRM as the outcome. Read More

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Amplicon-sequencing of raw milk microbiota: impact of DNA extraction and library-PCR.

Appl Microbiol Biotechnol 2021 Jun 1;105(11):4761-4773. Epub 2021 Jun 1.

Chair of Microbial Ecology, TUM School of Life Sciences, Technische Universität München, Weihenstephaner Berg 3, 85354, Freising, Germany.

The highly complex raw milk matrix challenges the sample preparation for amplicon-sequencing due to low bacterial counts and high amounts of eukaryotic DNA originating from the cow. In this study, we optimized the extraction of bacterial DNA from raw milk for microbiome analysis and evaluated the impact of cycle numbers in the library-PCR. The selective lysis of eukaryotic cells by proteinase K and digestion of released DNA before bacterial lysis resulted in a high reduction of mostly eukaryotic DNA and increased the proportion of bacterial DNA. Read More

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Natural water retention ponds for water management in agriculture: A potential scenario in Northern Italy.

J Environ Manage 2021 Aug 26;292:112849. Epub 2021 May 26.

Euro-Mediterranean Center on Climate Change and Ca' Foscari University of Venice, Edificio Porta Dell'Innovazione - Piano 2, Via Della Libertà, 12 - 30175, Marghera-Venice, VE, Italy.

Climate change is affecting water quantity and quality, with severe impacts on agricultural production. The use of nature-based solutions to address these challenges is increasing. Natural water retention ponds have been identified as viable solutions for water management in agriculture. Read More

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[Discussion on the multi-disciplinary dimensional basic problems and methodology systems of macroecosystem science research.]

Ying Yong Sheng Tai Xue Bao 2021 May;32(5):1531-1544

Synthesis Research Center of Chinese Ecosystem Research Network/Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.

The urgent requirement of human society to solve major resource and environmental pro-blems at the regional and global scales promotes the rises of macroecosystem science (MES) and the multidisciplinary fusions of natural science and humanities. Furthermore, it facilitates the innovation of macroecosystem scientific theory, as well as the development of continental and global scale knowledge fusion methodology and key technology. With the aim to serve the construction and deve-lopment of continental and global scale knowledge fusion methodological system for the changes of ecosystem status and resource environmental effect studies, we systematically elaborated the multi-disciplinary dimensional basic scientific problems, logic relationships and frontiers in the macroecosystem science, discussed the ideology and content of constructing the continental and global scale research methodological system, proposed to develop the networked observation-networked experiment-numerical simulation-knowledge fusion four-in-one infrastructures. Read More

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Microplastics in terrestrial ecosystems: Moving beyond the state of the art to minimize the risk of ecological surprise.

Glob Chang Biol 2021 May 27. Epub 2021 May 27.

Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden.

Microplastic (plastic particles measuring <5mm) pollution is ubiquitous. Unlike in other well-studied ecosystems, for example, marine and freshwater environments, microplastics in terrestrial systems are relatively understudied. Their potential impacts on terrestrial environments, in particular the risk of causing ecological surprise, must be better understood and quantified. Read More

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Consistent trade-offs in ecosystem services between land covers with different production intensities.

Biol Rev Camb Philos Soc 2021 May 24. Epub 2021 May 24.

Centre for Integrative Ecology, University of Canterbury, Christchurch, 8140, New Zealand.

Sustaining multiple ecosystem services across a landscape requires an understanding of how consistently services are shaped by different categories of land uses. Yet, this understanding is generally constrained by the availability of fine-resolution data for multiple services across large areas and the spatial variability of land-use effects on services. We systematically surveyed published literature for New Zealand (1970-2015) to quantify the supply of 17 non-production services across 25 land covers (as a proxy for land use). Read More

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What do we know (and need to know) about the role of urban habitats as ecological traps? Systematic review and meta-analysis.

Sci Total Environ 2021 Aug 18;780:146559. Epub 2021 Mar 18.

Centro de Investigaciones Biológicas, Universidad Autónoma del Estado de Hidalgo, Pachuca, Hidalgo, Mexico.

Urban areas represent a spectrum that goes from being safe habitats for biodiversity (i.e., habitats more or equally preferred, without costs to fitness) to being ecological traps (i. Read More

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Carbonate assisted lipid extraction and biodiesel production from wet microalgal biomass and recycling waste carbonate for CO supply in microalgae cultivation.

Sci Total Environ 2021 Jul 14;779:146445. Epub 2021 Mar 14.

School of Bioengineering, Dalian University of Technology, Dalian 116024, China; Ningbo Institute of Dalian University of Technology, No.26 Yucai Road, Jiangbei District, 315016 Ningbo, China. Electronic address:

High cost of microalgal biofuel is caused by all the steps in current technology, including cultivation, harvesting, lipid extraction, biofuel processing and wastewater and waste treatment. This study aims to systematically reduce these costs with one integrated process, in which carbonate is used for cell rupture, lipid extraction and biodiesel processing, and then recycled for CO absorption and carbon supply for a new round of algae cultivation. To reach this goal, carbonate-heating treatment with N, N' - dibutylurea which can enhance cell disruption were used for cell-wall breaking of wet Neochloris oleoabundans (UTEX 1185) biomass. Read More

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Long-term straw return with N addition alters reactive nitrogen runoff loss and the bacterial community during rice growth stages.

J Environ Manage 2021 Aug 19;292:112772. Epub 2021 May 19.

Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China; Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China. Electronic address:

Crop residue return is an effective, eco-friendly tillage method for decreasing reactive nitrogen (Nr) losses via surface runoff. However, the associated variation in Nr characteristics and its prospective mechanisms are not well understood. We systematically evaluated the response of Nr runoff loss and N variation in standing water to the abiotic and biotic parameters of soil in a paddy field after 6 years of straw return. Read More

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Landscape pattern change simulations in Tibet based on the combination of the SSP-RCP scenarios.

J Environ Manage 2021 Aug 17;292:112783. Epub 2021 May 17.

State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, 100875, Beijing, China.

Monitoring landscape pattern change can provide spatial explicit basis for future landscape management. The future socioeconomic and climate change drivers should be systematically combined in landscape pattern monitoring, while they are often regarded as independent parameters in landscape monitoring models. This study sought to project the detailed landscape pattern change based on landscape composition and configuration in Tibet by 2030, and combined the shared socioeconomic pathways (SSPs) and representative concentration pathways (RCPs). Read More

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Historical biogeography, systematics, and integrative taxonomy of the non-Ethiopian speckled pelage brush-furred rats (Lophuromys flavopunctatus group).

BMC Ecol Evol 2021 05 19;21(1):89. Epub 2021 May 19.

State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China.

Background: The speckled-pelage brush-furred rats (Lophuromys flavopunctatus group) have been difficult to define given conflicting genetic, morphological, and distributional records that combine to obscure meaningful accounts of its taxonomic diversity and evolution. In this study, we inferred the systematics, phylogeography, and evolutionary history of the L. flavopunctatus group using maximum likelihood and Bayesian phylogenetic inference, divergence times, historical biogeographic reconstruction, and morphometric discriminant tests. Read More

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Topological clustering of multilayer networks.

Proc Natl Acad Sci U S A 2021 May;118(21)

Department of Electrical and Computer Engineering, Princeton University, Princeton, NJ 08544;

Multilayer networks continue to gain significant attention in many areas of study, particularly due to their high utility in modeling interdependent systems such as critical infrastructures, human brain connectome, and socioenvironmental ecosystems. However, clustering of multilayer networks, especially using the information on higher-order interactions of the system entities, still remains in its infancy. In turn, higher-order connectivity is often the key in such multilayer network applications as developing optimal partitioning of critical infrastructures in order to isolate unhealthy system components under cyber-physical threats and simultaneous identification of multiple brain regions affected by trauma or mental illness. Read More

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Differences in kinetic metabolomics in Eisenia fetida under single and dual exposure of imidacloprid and dinotefuran at environmentally relevant concentrations.

J Hazard Mater 2021 May 8;417:126001. Epub 2021 May 8.

Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China. Electronic address:

Metabolomic responses of earthworms to neonicotinoids are important for understanding their molecular-level toxicity and assessing their ecological risks, but little is known until now. We investigated impact of imidacloprid (IMI, 52.6 ng/g) and dinotefuran (DIN, 52. Read More

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A systematic scoping review of the methodological approaches and effects of pesticide exposure on solitary bees.

PLoS One 2021 14;16(5):e0251197. Epub 2021 May 14.

ORISE Researcher, Oak Ridge Associated Universities, Research Triangle Park, Oak Ridge, North Carolina, United States of America.

Background: Pollination services provided by solitary bees, the largest group of bees worldwide, are critical to the vitality of ecosystems and agricultural systems alike. Disconcertingly, bee populations are in decline, and while no single causative factor has been identified, pesticides are believed to play a role in downward population trends. The effects of pesticides on solitary bee species have not been previously systematically cataloged and reviewed. Read More

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Engineering complex communities by directed evolution.

Nat Ecol Evol 2021 May 13. Epub 2021 May 13.

Department of Ecology & Evolutionary Biology, Yale University, New Haven, CT, USA.

Directed evolution has been used for decades to engineer biological systems at or below the organismal level. Above the organismal level, a small number of studies have attempted to artificially select microbial ecosystems, with uneven and generally modest success. Our theoretical understanding of artificial ecosystem selection is limited, particularly for large assemblages of asexual organisms, and we know little about designing efficient methods to direct their evolution. Read More

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