Author: Alexander J. ReisingerPublisher:
ISBN:
Category :
Languages : en
Pages : 235
Book Description
Assessing the Role of the Water Column in Nutrient Dynamics of Lotic Ecosystems
Author: Alexander J. ReisingerPublisher:
ISBN:
Category :
Languages : en
Pages : 235
Book Description
Nutrient Dynamics and Biological Structure in Shallow Freshwater and Brackish Lakes
Author: E. MortensenPublisher: Springer Science & Business Media
ISBN: 9401724601
Category : Science
Languages : en
Pages : 500
Book Description
The nutrient dynamics and biological structure of shallow non-stratified lakes differ markedly from that of deep and stratified lakes: for example, the return of nutrients lost through sedimentation is faster and the potential importance of fish and submerged macrophytes as food-web regulators is greater. In addition shallow lakes are more easily influenced by fluctuations in the physical environment caused by wind disturbance, temperature change, etc. Although shallow lakes are often the most common lake type in lowland countries, less attention has been paid to them than to deep stratified lakes and few comparisons have been made between shallow freshwater and brackish lakes. The volume is divided into five main themes, each introduced by an invited speaker: Nutrient dynamics with special emphasis on sediment water interactions and changes in loading (Professor Lambertus Lyklema); Biological structure and trophic interaction (Professor Stephen T. Threlkeld); Submerged macrophytes: dynamics and role in the lake ecosystems (Ass. Professor Kaj Sand Jensen); Comparison of freshwater and brackish lake ecosystems (Professor Brian Moss); Modelling the impact of nutrients, the biological structure and the recovery process (Dr Marten Scheffer).
Riverine Ecosystem Management
Author: Stefan SchmutzPublisher: Springer
ISBN: 3319732501
Category : Science
Languages : en
Pages : 562
Book Description
This open access book surveys the frontier of scientific river research and provides examples to guide management towards a sustainable future of riverine ecosystems. Principal structures and functions of the biogeosphere of rivers are explained; key threats are identified, and effective solutions for restoration and mitigation are provided. Rivers are among the most threatened ecosystems of the world. They increasingly suffer from pollution, water abstraction, river channelisation and damming. Fundamental knowledge of ecosystem structure and function is necessary to understand how human acitivities interfere with natural processes and which interventions are feasible to rectify this. Modern water legislation strives for sustainable water resource management and protection of important habitats and species. However, decision makers would benefit from more profound understanding of ecosystem degradation processes and of innovative methodologies and tools for efficient mitigation and restoration. The book provides best-practice examples of sustainable river management from on-site studies, European-wide analyses and case studies from other parts of the world. This book will be of interest to researchers in the field of aquatic ecology, river system functioning, conservation and restoration, to postgraduate students, to institutions involved in water management, and to water related industries.
Nutrient Dynamics and Retention in Land/Water Ecotones of Lowland, Temperate Lakes and Rivers
Author: A. Hillbricht-IlkowskaPublisher: Springer Science & Business Media
ISBN: 9401116024
Category : Science
Languages : en
Pages : 362
Book Description
Ecotones, or boundary zones between land and inland waters (such as lakes, streams and rivers), are the principal routes for transport of organic matter and nutrients across landscapes via physical and biological vectors. The ecotone is the place of cumulation and transformation of in situ production as well as of allochthonous material from adjacent aquatic and terrestrial systems. The ecotype functions as an important barrier or filter for principal nutrients, such as phosphorus and nitrogen, responsible for the eutrophication and degradation of surface waters. Intensive forest cutting, agriculture, pollution and bank regulation, urbanization and hydrotechnical constructions seriously endanger the ecotone systems and damage their protective function. It is vital to develop a scientific understanding of the behaviour of phosphorus and nitrogen in these transitional boundary habitats. Such an understanding is important for the rational protection, management and restoration of ecotones connected with lakes and rivers. The importance of nutrient cycling and retention is discussed from the point of view of ecotone function, management and reconstruction in order to sustain its protective role for water bodies. Various types of land/water transitory zones are discussed: wetlands, lake littoral systems, riparian zones of rivers, streams and brooks, the contact zones between groundwater and surface waters of lakes and rivers, air--water interfaces, and patch/ecotone structures in watersheds.
The Role of Geomorphology in River Biogeochemical Processing
Author: Elise LeNoir ChapmanPublisher:
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.
Nutrient Criteria Technical Guidance Manual
Author: Proceedings
Author: International Association of Theoretical and Applied LimnologyPublisher:
ISBN:
Category : Freshwater biology
Languages : en
Pages : 536
Book Description
Selected Water Resources Abstracts
Author: Algal Ecology
Author: Publisher: Academic Press
ISBN: 0080526942
Category : Science
Languages : en
Pages : 781
Book Description
Algae are an important component of aquatic benthic ecosystems because they reflect the health of their environment through their density, abundance, and diversity. This comprehensive and authoritative text is divided into three sections to offer complete coverage of the discussion in this field. The first section introduces the locations of benthic algae in different ecosystems, like streams, large rivers, lakes, and other aquatic habitats. The second section is devoted to the various factors, both biotic and abiotic, that affect benthic freshwater algae. The final section of the book focuses on the role played by algae in a variety of complex freshwater ecosystems. As concern over environmental health escalates, the keystone and pivotal role played by algae is becoming more apparent. This volume in the Aquatic Ecology Series represents an important compilation of the latest research on the crucial niche occupied by algae in aquatic ecosystems. - Presents algae as the important player in relation to environmental health - Prepared by leading authorities in the field - Includes comprehensive treatment of the functions of benthic algae as well as the factors that affect these important aquatic organisms - Acts as an important reference for anyone interested in understanding and managing freshwater ecosystems
Author: