Studies on Microbial Methanogenesis in Lake Mendota PDF Download
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Author: David Richard Nelson
Publisher:
ISBN:
Category :
Languages : en
Pages : 188
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Author: David Richard Nelson
Publisher:
ISBN:
Category :
Languages : en
Pages : 188
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Author: Jürgen Overbeck
Publisher: Springer Science & Business Media
ISBN: 1461226066
Category : Science
Languages : en
Pages : 408
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Book Description
Lake Plußsee is a small eutrophic kettle lake in northern Germany. Because it is sheltered and has no inflow from rivers, the Plußsee exhibits stable stratification and is especially suitable for limnological studies. This book presents the results of extensive research conducted on the ecophysiology of microorganisms - principally bacteria - at the Plußsee over the past several decades. It begins with three chapters on the general limnological state of the lake: physical factors, inorganic nutrients, plankton composition and succession, fish fauna, etc. These chapters are followed by discussions of dissolved organic matter and photosynthetic production of organic matter by phytoplankton. The remainder of the book addresses the dynamics of structure, function and metabolism of the microorganisms in the Plußsee.
Author:
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Category : Hydrology
Languages : en
Pages : 884
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Author: Patricia Quynh-Giao Tran
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Microbial communities are made up of microscopic organisms: viruses, bacteria, archaea, eukaryotes, and fungi. Their ability to exist under various and sometimes extreme conditions allows them to thrive in all corners of the environment. Aquatic environments cover 70% of the earth's surface and much of it is undergoing drastic human-impacted change. Rises in atmospheric temperature are leading to an increase in surface water temperatures, which leads to a cascade of ecological impacts, including oxygen depletion through physical and biological means. In this dissertation, I demonstrate how microbial communities, particularly bacteria, archaea, and phages (viruses that can impact prokaryotes) impact biogeochemical cycling in anoxic lakes. Using holistic approaches that cover both cultivation-dependent and independent methods, I aim to expand the way we approach studying microbial communities by leveraging interdisciplinary strengths to demonstrate that microbes and phages are interacting members that are highly dynamic in time and space. In Chapter 1 (Introduction), I summarize the role of freshwater lakes in biogeochemical cycling by focusing on the transformations that occur in the water column. For context, I compare and contrast some of the physical features of Lake Tanganyika and Lake Mendota, the two study sites in this work. I then give a broad summary of what is known about microbial and viral function in anoxic lakes. Together, these form the rationale for the next chapters. In Chapter 2, I used physiological and genomic evidence to characterize bacteria that were able to produce hydrogen sulfide under oxic conditions, a process typically associated with dissimilatory sulfate reduction which occurs under anoxic conditions. This work demonstrates and expands the spatiotemporal scope of hydrogen sulfide sources and sinks in the environment. In Chapter 3, I used genome-resolved metagenomics to characterize the potential contribution of bacteria and archaea in Lake Tanganyika, a permanently anoxic lake that happens to be one of the world's deepest and oldest lakes. This revealed that the anoxic hypolimnion of Lake Tanganyika had an extremely high proportion of Archaea, and endemic microorganisms, compared to other freshwater lakes worldwide, giving insight into the interplay between long-term anoxia and evolution. In Chapter 4, I provide a commentary that argues for a holistic way to study biogeochemical cycling: from an organismal and methodological perspective. In Chapter 5, I apply this holistic framework to assess the impact and interactions between phage and prokaryotes on biogeochemical cycling in a seasonally anoxic freshwater lake. We found that the bacterial community was sensitive to deoxygenation but the viral community was not. A broad range of bacterial taxa were infected by phages, but phages were highly specific. Phage-impacted bacteria were active in methane, sulfur, and nitrogen metabolism. Finally, time-series phage activity data showed the dynamic impact of phage-host interactions for nutrient cycling. Overall, the knowledge and framework generated in these studies improves our understanding of complex multi-kingdom species interactions and their associations with microbiology, ecology, and biogeochemistry in anoxic environments.
Author: Thomas D. Brock
Publisher: Springer Science & Business Media
ISBN: 1441987002
Category : Science
Languages : en
Pages : 320
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Book Description
Lake Mendota has often been called "the most studied lake in the world. " Beginning in the "classic" period of limnology in the late 19th century and continuing through the present time, this lake has been the subject of a wide variety of studies. Although many of these studies have been published in accessible journals, a significant number have appeared in local monographs and reports, ephemeral documents, or poorly distributed journals. To date, there has been no attempt at a synthetic treatment ofthe vast amount of work that has been published. One intent of the present book is to present a com prehensive compilation of the major early studies on Lake Mendota and to examine how they impinge on important present-day biological questions. In addition, this book presents a summary of field and laboratory work carried out in my own laboratory over a period of about 6 years and shows where correlations with earlier work exist. The book should be ofinterest to limnologists desiring a ready reference to data and published papers on this important lake, to biogeochemists, ocean ographers, and low-temperature geochemists interested in lakes as model sys tems for global processes, and to lake managers interested in understanding short-term and long-term changes in lake systems. Although the major thrust ofthe present book is ecologicaland environmental, sufficient background has been presented on other aspects ofLake Mendota's limnology so that the book should also be useful to nonbiologists.
Author: Lacy Daniels
Publisher:
ISBN:
Category :
Languages : en
Pages : 208
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Author:
Publisher:
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Category : Water
Languages : en
Pages : 690
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Author: Christine Cordaro Schilling
Publisher:
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Category : Methanotrophs
Languages : en
Pages : 226
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Author: Laetitia Morris Snow
Publisher:
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Category : Bacteria, Chromogenic
Languages : en
Pages : 154
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Author: Michael R. Winfrey
Publisher:
ISBN:
Category : Methanation
Languages : en
Pages : 512
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