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Author: Tom Andersen Publisher: Springer Science & Business Media ISBN: 3662034182 Category : Science Languages : en Pages : 291
Book Description
An analysis of the interactions between pelagic food web processes and element cycling in lakes. While some findings are examined in terms of classical concepts from the ecological theory of predator-prey systems, special emphasis is placed on exploring how stoichiometric relationships between primary producers and herbivores influence the stability and persistence of planktonic food webs. The author develops simple dynamic models of the cycling of mineral nutrients through plankton algae and grazers, and then goes on to explore them both analytically and numerically. The results thus obtained are of great interest to both theoretical and experimental ecologists. Moreover, the models themselves are of immense practical use in the area of lake management.
Author: Tom Andersen Publisher: Springer Science & Business Media ISBN: 3662034182 Category : Science Languages : en Pages : 291
Book Description
An analysis of the interactions between pelagic food web processes and element cycling in lakes. While some findings are examined in terms of classical concepts from the ecological theory of predator-prey systems, special emphasis is placed on exploring how stoichiometric relationships between primary producers and herbivores influence the stability and persistence of planktonic food webs. The author develops simple dynamic models of the cycling of mineral nutrients through plankton algae and grazers, and then goes on to explore them both analytically and numerically. The results thus obtained are of great interest to both theoretical and experimental ecologists. Moreover, the models themselves are of immense practical use in the area of lake management.
Author: W.R. Siegfried Publisher: Springer Science & Business Media ISBN: 3642822754 Category : Science Languages : en Pages : 715
Book Description
It is a pleasure and a distinct honour for me to greet the participants, guests and ob servers of this Fourth International Symposium on Antarctic Biology which has adopted nutrient cycles and food webs as its central theme. On behalf of the Scientific Committee on Antarctic Research (SCAR) and other bodies of the International Council of Scientific Unions (ICSU), I bid you welcome. SCAR is pleased to acknowledge the role of the co-sponsors for this Symposium which include the Scientific Committee on Oceanic Research (SCOR), the Interna tional Association of Biological Oceanography (IABO), and the International Union of Biological Sciences (IUBS). In addition, SCAR and its co-sponsors wish to acknowledge the financial support of the Council for Scientific and Industrial Re search (CSIR) and the Department of Transport (DOT) of the South African govern ment. Nor should we forget to acknowledge also the role of the South African Scientific Committee on Antarctic Research (SASCAR) and one of its leaders and Vice President of SCAR, Mr. Jan de Wit, in arranging this charming venue for this Symposium.
Author: T. Tamminen Publisher: Springer Science & Business Media ISBN: 9401714932 Category : Science Languages : en Pages : 335
Book Description
The PELAG 1996 Symposium Proceedings provides the reader with the latest advances in the study of planktonic cycling of matter and energy, placing a strong emphasis on the effects of eutrophication on these processes. This book covers a wide range of topics in the field, including: Nutrient limitation of phytoplankton growth Nutrient cycles in the planktonic food web DOM sources, composition, and uptake Resource limitation vs. shaping of the food web by grazing Spatio-temporal variability: coupling of physical and biological processes Processes controlling sinking losses from the pelagic system Planktonic food web modelling . The book should be of interest to everybody involved in planktonic ecosystem research, from the advanced student to the distinguished scientist. This volume brings to the reader the expertise of internationally renowned authors on the main issues of today's ecological plankton research.
Author: Subhadeep Rakshit Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The biogeochemical cycling of nutrients and oxygen in the coastal ocean is of high importance given that anthropogenic nutrient inputs have doubled the preindustrial nutrient load to water bodies. In particular, excess nitrogen (N) causes eutrophication and hypoxia in the coastal ocean, which is further exacerbated by increased stratification due to global warming. Owing to relatively shallow waters in coastal regions, processes within the sediment and water column play equally important roles in key biogeochemical cycles. To understand the factors that regulate the nutrient and oxygen cycle in seasonally hypoxic coastal basins, this thesis employs high-resolution field observations conducted in Bedford Basin, coupled with numerical modeling, to investigate the impact of various geochemical, biological, and physical drivers. In Chapter 2, field observations of weekly CTD casts and measured benthic oxygen uptake were used to develop and parameterize a numerical model to understand the development of hypoxia in Bedford Basin and quantify different sources and sinks of oxygen in three contrasting years. Chapter 3 is focused on understanding the annual development of the nitrogen cycle based on weekly timeseries of geochemical parameters and phylogenetic marker genes in bottom waters over four consecutive years. Measured geochemical and biological parameters were incorporated into a box model to simulate the nitrification dynamics and identify the controlling factors. Through this approach, a novel mechanism of nitrification was identified whereby strong physical mixing dilutes the resident nitrifier biomass leading to delayed and decoupled nitrification. Weak physical mixing during winter may have the reverse effect. In Chapter 4, benthic biogeochemical processes were studied through seasonal measurements of organic matter remineralization rate, benthic fluxes, sediment geochemical profiles, along with reaction-transport modeling. Overall, this thesis studied the development of hypoxia in a coastal basin, nutrient cycles in the water column and sediment, and the physical and biological drivers of coupled biogeochemical cycles.
Author: Ulrich Sommer Publisher: Springer Science & Business Media ISBN: 3642748902 Category : Science Languages : en Pages : 378
Book Description
All relevant ecological aspects of plankton, especially seasonal changes in the species composition, the role of competition for limiting resources in species replacements, the role of parasitism, predation and competition in seasonal succession are treated in detail considering phytoplankton, zooplankton and bacteroplankton. In addition to its use as a valid reference book for plankton ecology, this monograph may well be used as a model for other kinds of ecological communities.
Author: Rachael James Publisher: Butterworth-Heinemann ISBN: 0750667931 Category : Biogeochemical cycles Languages : en Pages : 131
Book Description
This Volume belongs to a series on Oceanography. It is designed so that it can be read on its own, or used as a supplement in oceanogrphy courses. After a brief introduction to sea-floor sediments, the book shows how the activities of marine organisms cycle nutrients and other dissolved constituents within the oceans, and influence the rates at which both solid and dissolved material is removed to sediments. It goes on to review the carbonate system and shows how sediments that come from continental areas may be transported to the deep sea, explores what sea-floor sediments have taught us about the history of the oceans, and describes the biological and chemical processes that continue long after sediments have been deposited on the deep sea-floor. * Covers the basics on the occurrence, distribution, and cycling of chemical elements in the ocean * Features full-color photographs and beautiful illustrations throughout * Reader-friendly layout, writing, and graphics * Pedagogy includes chapter summaries, chapter questions with answers and comments at the end of the book; highlighted key terms; and boxed topics and explanations * Can be used alone, as a supplement, or in combination with other Open University titles in oceanography
Author: Tom Andersen
Author: Tom Andersen
Author: Anna-Stiina Heiskanen
Author: Tobias Vrede
Author: V. SMETACEK
Author: W.R. Siegfried
Author: Timo Tamminen
Author: T. Tamminen
Author: Subhadeep Rakshit
Author: Ulrich Sommer
Author: Rachael James