Author: William V. SobczakPublisher:
ISBN:
Category :
Languages : en
Pages : 488
Book Description
Microbial Metabolism of Dissolved Organic Carbon in Stream Hyporheic Zones
Author: William V. SobczakCarbon Composition and Source Influence on Microbial Community Function and Structure in the Hyporheic Corridor
Author: Noah W. SternPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
The hyporheic zone is the area just below a river where constant mixing of groundwater and river water occurs. At this intersection between two sources of water, with different organic carbon and nutrient contents, complimentary pairing of electron donors and acceptors occurs, causing elevated rates of microbial metabolism. Due to these constant changes in electron acceptor and donor availability and because of microbial oxygen consumption dynamics, redox cycling process are constantly occurring and changing within the hyporheic zone. Iron oxides are theorized to play an important role in protecting sediment organic carbon from microbial metabolism through the formation of organo-metal aggregates. This thesis document outlines three related experiments investigating how different sources and forms of organic carbon found in freshwater river and groundwater systems effects hyporheic zone microbial metabolism rates. These studies revealed that deposition of autochthonous and allochthonous organic carbon to the riverbed sediment matrix (i.e. hyporheic zone) was correlated with release of labile dissolved organic carbon. Photosynthetic periphyton biomass (i.e. autochthonous epilithic biomass) was identified as a key source of organic carbon, which lead to highly elevated rates of aerobic respiration, anaerobic respiration, and methanogenesis. The presence of small pockets of anaerobic respiration and methanogenesis was observed within predominantly aerobic metabolizing sediment batch reactors; this shows that hyporheic zone sediment microbial community structure is highly heterogenous with patches of flexible metabolism occurring, depending on electron donor/acceptor availability. Iron bound organic carbon content was correlated with the presence of reactive iron oxide minerals, and these organo-metal aggregates were not biodegraded due to preferential metabolism of more labile pools of carbon such as fresh periphyton POM and DOC. The increase in microbial activity associated with fresh periphyton biomass deposition shows that in freshwater river systems periphyton biomass is a major contributor to ecosystem respiration as well as gross primary productivity. Understanding how natural and anthropogenic inputs of organic carbon, nitrogen, phosphorous and sulfate cause changes in periphyton growth and hence changes in hyporheic zone microbial metabolism is on ongoing challenge to modeling the global carbon cycle.
Metabolism of streamwater dissolved organic carbon in the shallow hyporheic zone
Author: S. FINDLAYAquatic Ecosystems: Interactivity of Dissolved Organic Matter
Author: Stuart FindlayPublisher: Academic Press
ISBN: 0122563719
Category : Nature
Languages : en
Pages : 534
Book Description
Overviews of the source, supply and variability of DOM, surveys of the processes that mediate inputs to microbial food webs, and syntheses consolidating research findings provide a comprehensive review of what is known of DOM in freshwater. This book will be important to anyone interested in understanding the fundamental factors associated with DOM that control aquatic ecosystems."--BOOK JACKET.
Stream Ecology
Author: J. David AllanPublisher: Springer Science & Business Media
ISBN: 1402055838
Category : Science
Languages : en
Pages : 444
Book Description
A hugely important text for advanced undergraduates as well as graduates with an interest in stream and river ecology, this second, updated edition is designed to serve as a textbook as well as a working reference for specialists in stream ecology and related fields. The book presents vital new findings on human impacts, and new work in pollution control, flow management, restoration and conservation planning that point to practical solutions. All told, the book is expanded in length by some twenty-five percent, and includes hundreds of figures, most of them new.
The Molecular Ecology of Hyporheic Zones
Author: Catherine M. FebriaPublisher:
ISBN: 9780494976869
Category :
Languages : en
Pages :
Book Description
Streams and Ground Waters
Author: Jeremy B. JonesPublisher: Elsevier
ISBN: 0080517994
Category : Science
Languages : en
Pages : 447
Book Description
Streams around the world flow toward the sea in floodplains. All along this transit, there is exchange of water between the stream itself and the surrounding sediments which form the floodplain. Many chemical, biological, and geological processes occur when water moves back and forth between streams and these flood plain sediments. Streams and Groundwaters focuses on the consequences of water flow between streams, their underlying sediments, and surrounding landscapes. Certain to appeal to anyone interested in stream ecology, the management of stream ecosystems, or landscape ecology, this volume should become a oft-opened reference.
Limnology
Author: Robert G. WetzelPublisher: Gulf Professional Publishing
ISBN: 0127447601
Category : Nature
Languages : en
Pages : 1023
Book Description
This book gives a comparative treatment of topics accross lake, reservoir, and rive ecosystems. These analysis do indeed indicate differences among the properties of lakes, land-water interface regions, reservoirs, and rivers. Importantly, these analysis also indicate marked commonality in function.
Methods in Stream Ecology
Author: F. Richard HauerPublisher: Academic Press
ISBN: 0080547435
Category : Science
Languages : en
Pages : 894
Book Description
Methods in Stream Ecology, Second Edition, provides a complete series of field and laboratory protocols in stream ecology that are ideal for teaching or conducting research. This updated edition reflects recent advances in the technology associated with ecological assessment of streams, including remote sensing. In addition, the relationship between stream flow and alluviation has been added, and a new chapter on riparian zones is also included. The book features exercises in each chapter; detailed instructions, illustrations, formulae, and data sheets for in-field research for students; and taxanomic keys to common stream invertebrates and algae. With a student-friendly price, this book is key for all students and researchers in stream and freshwater ecology, freshwater biology, marine ecology, and river ecology. This text is also supportive as a supplementary text for courses in watershed ecology/science, hydrology, fluvial geomorphology, and landscape ecology. Exercises in each chapter Detailed instructions, illustrations, formulae, and data sheets for in-field research for students Taxanomic keys to common stream invertebrates and algae Link from Chapter 22: FISH COMMUNITY COMPOSITION to an interactive program for assessing and modeling fish numbers
Understanding the Role of the Stream-Groundwater Interface in Dissolved Organic Carbon Cycling in a Third-Order, Lowland River Network
Author: Sydney S. RuhalaPublisher:
ISBN: 9781369730289
Category : Electronic dissertations
Languages : en
Pages : 188
Book Description