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Author: Elise LeNoir Chapman Publisher: ISBN: Category : Electronic dissertations Languages : en Pages : 160
Book Description
Although once treated as simple downstream transporters of material, river networks are now recognized for their role in processing, or transformation, storage, and removal, of carbon and nutrients during transport. The linkages between channel geomorphic structure, biogeochemistry, and ecology of lotic ecosystems are important to their functioning. The overarching goal of this research was to develop a better understanding of the relationships among geomorphology, ecosystem metabolism, and carbon and nutrient dynamics in a larger river. This research exploited natural changes in river form associated with broad-scale geologic transitions in the Cahaba River, AL. Spatial and temporal patterns of ecosystem metabolism along the Cahaba indicated an important effect of regional geology. In the Coastal Plain this effect was expressed through strong seasonal changes in plankton productivity, driving high rates of gross primary production and ecosystem respiration. Anthropogenic activity associated with Birmingham, AL, causes elevated water-column nutrient concentrations. However, downstream nutrient levels are comparable to upstream of Birmingham. Corresponding to the location of this decline is a broad geomorphic transition creating shoal habitat, which supports expansive crops of macrophytes. We found whole ecosystem metabolism, and the biomass of macrophytes, could significantly contribute to water column nutrient declines. Recent models of organic matter export from rivers have identified the potential significance of seasonal pulses of autochthonous production and the dearth of knowledge regarding the fate of riverine algal production. Our evaluation of phytoplankton production, in the Coastal Plain, confirmed an important role in fueling water column processing and provided evidence of phytoplankton delivery to sediments. The identity and characteristics of primary producers appears to be constrained by broad geomorphologic transitions and has widespread ecological consequences including altering the timing and character of nutrient and carbon delivery downstream and the spatially and temporally dynamic nature of the relative importance of water-column and benthic processes. Overall, this research contributes to our understanding of river biogeochemistry by highlighting the complexity and variability of interactions among factors influencing rates of carbon and nutrient processing. Expanding the spatial and temporal scales of empirical measurements of ecosystem processes is critical to accurately predicting the biogeochemical activity of river networks.
Author: Elise LeNoir Chapman Publisher: ISBN: Category : Electronic dissertations Languages : en Pages : 160
Book Description
Although once treated as simple downstream transporters of material, river networks are now recognized for their role in processing, or transformation, storage, and removal, of carbon and nutrients during transport. The linkages between channel geomorphic structure, biogeochemistry, and ecology of lotic ecosystems are important to their functioning. The overarching goal of this research was to develop a better understanding of the relationships among geomorphology, ecosystem metabolism, and carbon and nutrient dynamics in a larger river. This research exploited natural changes in river form associated with broad-scale geologic transitions in the Cahaba River, AL. Spatial and temporal patterns of ecosystem metabolism along the Cahaba indicated an important effect of regional geology. In the Coastal Plain this effect was expressed through strong seasonal changes in plankton productivity, driving high rates of gross primary production and ecosystem respiration. Anthropogenic activity associated with Birmingham, AL, causes elevated water-column nutrient concentrations. However, downstream nutrient levels are comparable to upstream of Birmingham. Corresponding to the location of this decline is a broad geomorphic transition creating shoal habitat, which supports expansive crops of macrophytes. We found whole ecosystem metabolism, and the biomass of macrophytes, could significantly contribute to water column nutrient declines. Recent models of organic matter export from rivers have identified the potential significance of seasonal pulses of autochthonous production and the dearth of knowledge regarding the fate of riverine algal production. Our evaluation of phytoplankton production, in the Coastal Plain, confirmed an important role in fueling water column processing and provided evidence of phytoplankton delivery to sediments. The identity and characteristics of primary producers appears to be constrained by broad geomorphologic transitions and has widespread ecological consequences including altering the timing and character of nutrient and carbon delivery downstream and the spatially and temporally dynamic nature of the relative importance of water-column and benthic processes. Overall, this research contributes to our understanding of river biogeochemistry by highlighting the complexity and variability of interactions among factors influencing rates of carbon and nutrient processing. Expanding the spatial and temporal scales of empirical measurements of ecosystem processes is critical to accurately predicting the biogeochemical activity of river networks.
Author: Thibault Datry Publisher: Academic Press ISBN: 0128039043 Category : Science Languages : en Pages : 624
Book Description
Intermittent Rivers and Ephemeral Streams: Ecology and Management takes an internationally broad approach, seeking to compare and contrast findings across multiple continents, climates, flow regimes, and land uses to provide a complete and integrated perspective on the ecology of these ecosystems. Coupled with this, users will find a discussion of management approaches applicable in different regions that are illustrated with relevant case studies. In a readable and technically accurate style, the book utilizes logically framed chapters authored by experts in the field, allowing managers and policymakers to readily grasp ecological concepts and their application to specific situations. - Provides up-to-date reviews of research findings and management strategies using international examples - Explores themes and parallels across diverse sub-disciplines in ecology and water resource management utilizing a multidisciplinary and integrative approach - Reveals the relevance of this scientific understanding to managers and policymakers
Author: Gary J. Brierley Publisher: John Wiley & Sons ISBN: 111868530X Category : Science Languages : en Pages : 424
Book Description
This book outlines a generic set of procedures, termed the River Styles Framework, which provides a set of tools for interpreting river character, behavior, condition, and recovery potential. Applications of the framework generate a coherent package of geomorphic information, providing a physical template for river rehabilitation activities. management and restoration of rivers is a rapidly growing topic for environmental scientists, geologists and ecologists - this book provides a learning tool with which to approach geomorphic applications to river management describes the essential geomorphological principles underlying river behaviour and evolution demonstrates how the River Styles Framework can turn geomorphic theory into practice, to develop workable strategies for restoration and management based on real case studies and authors extensive experience applicable to river systems worldwide synthesises fluvial geomorphology, ecology and management
Author: Jeremy B. Jones Publisher: Elsevier ISBN: 0124059198 Category : Science Languages : en Pages : 566
Book Description
Stream Ecosystems in a Changing Environment synthesizes the current understanding of stream ecosystem ecology, emphasizing nutrient cycling and carbon dynamics, and providing a forward-looking perspective regarding the response of stream ecosystems to environmental change. Each chapter includes a section focusing on anticipated and ongoing dynamics in stream ecosystems in a changing environment, along with hypotheses regarding controls on stream ecosystem functioning. The book, with its innovative sections, provides a bridge between papers published in peer-reviewed scientific journals and the findings of researchers in new areas of study. - Presents a forward-looking perspective regarding the response of stream ecosystems to environmental change - Provides a synthesis of the latest findings on stream ecosystems ecology in one concise volume - Includes thought exercises and discussion activities throughout, providing valuable tools for learning - Offers conceptual models and hypotheses to stimulate conversation and advance research
Author: Bruce L. Rhoads Publisher: Cambridge University Press ISBN: 1108173780 Category : Science Languages : en Pages : 544
Book Description
Rivers are important agents of change that shape the Earth's surface and evolve through time in response to fluctuations in climate and other environmental conditions. They are fundamental in landscape development, and essential for water supply, irrigation, and transportation. This book provides a comprehensive overview of the geomorphological processes that shape rivers and that produce change in the form of rivers. It explores how the dynamics of rivers are being affected by anthropogenic change, including climate change, dam construction, and modification of rivers for flood control and land drainage. It discusses how concern about environmental degradation of rivers has led to the emergence of management strategies to restore and naturalize these systems, and how river management techniques work best when coordinated with the natural dynamics of rivers. This textbook provides an excellent resource for students, researchers, and professionals in fluvial geomorphology, hydrology, river science, and environmental policy.
Author: Kirstie A. Fryirs Publisher: John Wiley & Sons ISBN: 1118305442 Category : Science Languages : en Pages : 650
Book Description
Filling a niche in the geomorphology teaching market, this introductory book is built around a 12 week course in fluvial geomorphology. ‘Reading the landscape’ entails making sense of what a riverscape looks like, how it works, how it has evolved over time, and how alterations to one part of a catchment may have secondary consequences elsewhere, over different timeframes. These place-based field analyses are framed within their topographic, climatic and environmental context. Issues and principles presented in the first part of this book provide foundational understandings that underpin the approach to reading the landscape that is presented in the second half of the book. In reading the landscape, detective-style investigations and interpretations are tied to theoretical and conceptual principles to generate catchment-specific analyses of river character, behaviour and evolution, including responses to human disturbance. This book has been constructed as an introductory text on river landscapes, providing a bridge and/or companion to quantitatively-framed or modelled approaches to landscape analysis that are addressed elsewhere. Key principles outlined in the book emphasise the importance of complexity, contingency and emergence in interpreting the character, behaviour and evolution of any given system. The target audience is second and third year undergraduate students in geomorphology, hydrology, earth science and environmental science, as well as river practitioners who use geomorphic understandings to guide scientific and/or management applications. The primary focus of Kirstie and Gary’s research and teaching entails the use of geomorphic principles as a tool with which to develop coherent scientific understandings of river systems, and the application of these understandings in management practice. Kirstie and Gary are co-developers of the River Styles® Framework and Short Course that is widely used in river management, decision-making and training. Additional resources for this book can be found at: www.wiley.com/go/fryirs/riversystems.
Author: Jerry R. Miller Publisher: Springer Science & Business Media ISBN: 1402056028 Category : Science Languages : en Pages : 427
Book Description
This book provides an introductory understanding of fluvial geomorphic principles and how these principles can be integrated with geochemical data to cost-effectively characterize, assess and remediate contaminated rivers. The book stresses the importance of needing to understand both geomorphic and geochemical processes. Thus, the overall presentation is first an analysis of physical and chemical processes and, second, a discussion of how an understanding of these processes can be applied to specific aspects of site assessment and remediation. Such analyses provide the basis for a realistic prediction of the kinds of environmental responses that might be expected, for example, during future changes in climate or land-use.
Author: Egon T. Degens Publisher: ISBN: Category : Science Languages : en Pages : 394
Book Description
This extract of the SCOPE/UNEP project ``Transport of Carbon and Minerals in Major World Rivers, Lakes, and Estuaries'' provides a comprehensive overview of the biogeochemistry of major rivers and their role in the biogeochemical cycles of its life-supporting animals for the first time. Rivers are viewed by continent or under certain scientific aspects. Concrete data on the chemistry and fluxes of major world rivers are given in addition to a more theoretical approach to the riverine system.
Author: Thomas Bianchi Publisher: Cambridge University Press ISBN: 1107022576 Category : Science Languages : en Pages : 673
Book Description
A comprehensive, state-of-the-art synthesis of biogeochemical dynamics and the impact of human alterations at major river-coastal interfaces for advanced students and researchers.
Author: Elise LeNoir Chapman
Author: Elise LeNoir Chapman
Author: Thibault Datry
Author: Gary J. Brierley
Author: Jeremy B. Jones
Author: Bruce L. Rhoads
Author: Kirstie A. Fryirs
Author: Jerry R. Miller
Author: Egon T. Degens
Author: Thomas Bianchi
Author: Frederick Yiu Sum Cheng