Assembly and Functioning of Microbial Communities Along Terrestrial Resource Gradients in Boreal Lake Sediments PDF Download
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Author: Chloé Shoshana Jessica Orland
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Chloé Shoshana Jessica Orland
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Lunhui Lu
Publisher: Frontiers Media SA
ISBN: 2832539874
Category : Science
Languages : en
Pages : 188
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Dams or barriers are among the most significant anthropogenic threats to global freshwater ecosystems, although they provide invaluable services for shipping, hydropower generation, flood protection, and storage of drinking and irrigation water. River fragmentations due to dams and barriers lead the aquatic landscape into isolated river sections, resulting in hydromorphological discontinuities along longitudinal or lateral gradients. Fragmented river habitats are unstable. They experience uncertain disturbances in both time and space with random and complex hydrological and environmental processes, such as water flow, particulate matter sedimentation, reservoir regulation, and terrestrial input. The diversity, composition, functionality, and activity of microbial communities are important indicators of river ecosystem functions and services. Yet, river fragmentations are likely to disrupt and reconstruct microbial communities, redirecting the patterns of biogeochemical cycles of biogenic elements. Methodology, such as mathematical models, is still limited to describing and elucidating microbial processes under changing hydrological environments in the fragmented rivers. Thus, how do the riverine microbial communities and ecosystem functions respond to the fragmentation in rivers? This Research Topic represents a collective focus on microbial ecology, functional diversity, and new microbial modeling in fragmented rivers. We wish to present new findings in community assembly mechanisms, biotic interactions, functional diversity, and ecosystem functioning responses to the river fragmentations. New perspectives will also provide us with deep insights into the ecological effects of river fragmentation. This Research Topic aims to present the original research articles and reviews to provide new findings on microbial diversity and ecosystem functioning in fragmented rivers worldwide. We welcome original research, reviews, mini-reviews, opinions, methods, hypotheses and theories, and perspectives. The directions include but are not limited to the following aspects: - The continuum of the microbial community in responses to dams or barriers. - Novel microbial community assembly mechanisms, functional traits, and biotic interactions in fragmented rivers at local, regional, and global scales. - Functional genes, functional groups, and functional diversity in driving biogenic element cycles. - Mathematical modeling in aquatic microbial ecology.
Author: Kurt Yakimovich
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Freshwater lake sediments play key roles in the cycling of carbon. This includes hosting microbial communities responsible for mineralizing large amounts of carbon into greenhouse gases-namely CO2 and CH4. Yet despite the important roles of sediment communities, their ecology and community structure linkages to biogeochemical cycling are not well known, and little data exists exploring how sediment microbial communities respond to different organic matter inputs. Here I start by reviewing previous literature on lake sediment microbial communities and the physicochemical factors affecting their composition and diversity. Next I report on data from two experiments, first an in-vitro lab study and then an in-situ field study, in which lake sediments were amended with different plant litters that could result from land use change and or succession in catchments. Microbial communities were examined with next generation amplicon sequencing. These data were linked to rates of CO2 and CH4 flux and dissolved organic matter (DOM) components present in pore water were examined as potential controls on community structure and function. I observed in-vitro that methanogen community composition and activity were affected by OM type, with macrophyte derived C enhancing microbial activity, whereas high concentrations of polyphenolic compounds from terrestrial tree litters inhibited methanogen activity. The polyphenols had an environmental filtering effect, selecting for different bacteria, fungi and methanogen communities. The in-situ experiments involved installing mesocosms with artificial sediments with variable amounts of deciduous and coniferous tree leaf litter. In these mesocosms we observed a link between methanogen community composition and decomposition rates, as measured with bulk CO2 and CH4 production and DOM humification. Decomposition rates were influenced by lake physicochemical factors, particularly the degree of photoexposure. With increased decomposition, specialist taxa of methanogens could thrive that conferred higher rates of methanogenesis. The work presented here demonstrates the adaptability of methanogen lake sediment communities as terminal decomposers under changing terrestrial OM subsidies.
Author: Matthew John Hoostal
Publisher:
ISBN:
Category : Erie, Lake
Languages : en
Pages : 189
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Lake Erie demonstrates the greatest productivity of the Laurentian Great Lakes, yet has been critically impacted by anthropogenic activities throughout the Lake Erie watershed. Lake Erie is comprised of three major basins, with east-to-west gradients of increasing drainage areas, increasing riverine inputs of nutrients and xenobiotics, as well as decreasing depth. These large-scale geochemical gradients may be expected to result in spatial patterns of microbial community composition, nutrient cycling, and xenobiotic transformation. As such, Lake Erie provides an excellent system to examine the local adaptation of microbial communities throughout a large freshwater ecosystem. Spatial patterns of microbial community composition, as well as functional diversity, across the three basins of Lake Erie were assessed to examine the potential adaptation of microbial communities to local selective pressures. Community composition was investigated through the generation of 16S rDNA libraries, while functional diversity was evaluated with substrate-induced respiration (SIR) and extracellular enzyme activities (EEA) profiles. EEA profiles were subsequently measured to examine microbial community resilience to metal inoculations in sediments contaminated with heavy metals compared to relatively pristine sediments. Bioinformatic studies of bacterial genes involved in the efflux of heavy metals from the cell were performed to provide a conceptual framework of how horizontal gene transfer may expedite the adaptation of bacterial communities to heavy metal stress. Finally, the local adaptation of bacterial communities to PCBs and PAHs was assessed by comparing the diversity of bphA, a gene that initiates PCB metabolism, in polluted and relatively unpolluted sediments within the Lake Erie watershed. Collectively, results suggested large-scale spatial patterns of microbial community composition, functional diversity, and metabolic resilience consistent with the local adaptation of sediment bacterial communities to allochthonous inputs of organic matter and heavy metal pollutants into Lake Erie. Furthermore, estimates of diversity from bphA environmental gene libraries suggest that PCB and PAH contamination represents a driving force in the adaptation of microbial communities in polluted sediments. Results from this study suggest that microbial communities are highly integrated assemblages of multiple taxa locally adapted to differential inputs of nutrients and xenobiotics across geochemical gradients within freshwater ecosystems.
Author: Petr Šmilauer
Publisher: Cambridge University Press
ISBN: 110769440X
Category : Mathematics
Languages : en
Pages : 375
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Book Description
An accessible introduction to the theory and practice of multivariate analysis for graduates, researchers and professionals dealing with ecological problems.
Author: Marika Pellegrini
Publisher: Frontiers Media SA
ISBN: 2832554490
Category : Technology & Engineering
Languages : en
Pages : 187
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Book Description
The Earth's population, currently estimated at 7.86 billion, is expected to rise to 9.8 billion by 2050. This increase will inevitably lead to a greater pressure on agricultural land in order to achieve food security. However, agricultural sustainability is still constrained by its over-reliance on chemical fertilizers, pesticides, and herbicides. These conventional practices may lead to severe negative environmental consequences, typically evidenced by a loss in soil organic matter and reduction in soil microbial diversity, negatively impacting on food production. The challenging situation identified above is likely to be worsened by climate change, soil health deterioration, and by a range of biotic and abiotic stresses. Biotic and abiotic stress management, enhancement of crop yields, nutrient cycling, and natural bio-resources harnessing optimization can be achieved by modifying the soil microbiome. Discovering and exploiting potentially beneficial soil microbes is crucial to achieving sustainable agriculture production in the face of these issues. Among the plethora of potentially beneficial microbes, plant growth-promoting microbes (PGPM) and arbuscular mycorrhizal fungi (AMF) are often considered to be safe and environment-friendly tools to deal with various stresses. The interest in adopting novel methods that increase crop yield, soil health, and fertility will be positively impacted by a better understanding of the fate and behaviour of PGPM and AMF use in agriculture.
Author: E. C. Pielou
Publisher: New York : Wiley-Interscience
ISBN:
Category : Science
Languages : en
Pages : 296
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Book Description
Population dynamics; Spatial patterns in one-species populations; Spatial relations of two or more species; Many-species populations.
Author: Myles Hollander
Publisher: John Wiley & Sons
ISBN: 1118553292
Category : Mathematics
Languages : en
Pages : 872
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Book Description
Praise for the Second Edition “This book should be an essential part of the personal library of every practicing statistician.”—Technometrics Thoroughly revised and updated, the new edition of Nonparametric Statistical Methods includes additional modern topics and procedures, more practical data sets, and new problems from real-life situations. The book continues to emphasize the importance of nonparametric methods as a significant branch of modern statistics and equips readers with the conceptual and technical skills necessary to select and apply the appropriate procedures for any given situation. Written by leading statisticians, Nonparametric Statistical Methods, Third Edition provides readers with crucial nonparametric techniques in a variety of settings, emphasizing the assumptions underlying the methods. The book provides an extensive array of examples that clearly illustrate how to use nonparametric approaches for handling one- or two-sample location and dispersion problems, dichotomous data, and one-way and two-way layout problems. In addition, the Third Edition features: The use of the freely available R software to aid in computation and simulation, including many new R programs written explicitly for this new edition New chapters that address density estimation, wavelets, smoothing, ranked set sampling, and Bayesian nonparametrics Problems that illustrate examples from agricultural science, astronomy, biology, criminology, education, engineering, environmental science, geology, home economics, medicine, oceanography, physics, psychology, sociology, and space science Nonparametric Statistical Methods, Third Edition is an excellent reference for applied statisticians and practitioners who seek a review of nonparametric methods and their relevant applications. The book is also an ideal textbook for upper-undergraduate and first-year graduate courses in applied nonparametric statistics.
Author: Edward F. DeLong
Publisher: Springer
ISBN: 9783642301193
Category : Science
Languages : en
Pages : 567
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Book Description
The Prokaryotes is a comprehensive, multi-authored, peer reviewed reference work on Bacteria and Achaea. This fourth edition of The Prokaryotes is organized to cover all taxonomic diversity, using the family level to delineate chapters. Different from other resources, this new Springer product includes not only taxonomy, but also prokaryotic biology and technology of taxa in a broad context. Technological aspects highlight the usefulness of prokaryotes in processes and products, including biocontrol agents and as genetics tools. The content of the expanded fourth edition is divided into two parts: Part 1 contains review chapters dealing with the most important general concepts in molecular, applied and general prokaryote biology; Part 2 describes the known properties of specific taxonomic groups. Two completely new sections have been added to Part 1: bacterial communities and human bacteriology. The bacterial communities section reflects the growing realization that studies on pure cultures of bacteria have led to an incomplete picture of the microbial world for two fundamental reasons: the vast majority of bacteria in soil, water and associated with biological tissues are currently not culturable, and that an understanding of microbial ecology requires knowledge on how different bacterial species interact with each other in their natural environment. The new section on human microbiology deals with bacteria associated with healthy humans and bacterial pathogenesis. Each of the major human diseases caused by bacteria is reviewed, from identifying the pathogens by classical clinical and non-culturing techniques to the biochemical mechanisms of the disease process. The 4th edition of The Prokaryotes is the most complete resource on the biology of prokaryotes. The following volumes are published consecutively within the 4th Edition: Prokaryotic Biology and Symbiotic Associations Prokaryotic Communities and Ecophysiology Prokaryotic Physiology and Biochemistry Applied Bacteriology and Biotechnology Human Microbiology Actinobacteria Firmicutes Alphaproteobacteria and Betaproteobacteria Gammaproteobacteria Deltaproteobacteria and Epsilonproteobacteria Other Major Lineages of Bacteria and the Archaea
Author: Suhaib A. Bandh
Publisher: Academic Press
ISBN: 012817496X
Category : Science
Languages : en
Pages : 452
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Book Description
Freshwater Microbiology: Perspectives of Bacterial Dynamics in Lake Ecosystems provides a comprehensive and systematic analysis of microbial ecology in lakes. It offers basic information on how well the bacterial community composition varies along the spatio-temporal and trophic gradients along with the evaluation of the bioindicator species of bacteria so as to act as a key to predict the trophic status of lake ecosystems. The book helps to identify the factors of potential importance in structuring the bacterial communities in lakes as it delves into the dynamics and diversity of bacterial community composition in relation to various water quality parameters. It helps to identify the possibility of bioremediation plans and devising future policy decisions, with better conservation and management practices. - Provides a comprehensive and systematic analysis of microbial ecology - Helps to identify the factors of potential importance in structuring the bacterial community composition - Gives insight into the bacterial diversity of freshwater lake ecosystems along with their industrial potential - Caters to the needs and aspirations of students and professional researchers
