Download or read book Phytoplankton Growth and the Effects of Zooplankton Grazing in a Phosphorus Limited System written by Richard David Pridmore and published by . This book was released on 1979 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Nutrient Input and Microzooplankton Grazing on Phytoplankton Productivity in the Grand Bay Estuary Mississippi written by Gary Christopher Baine (II.) and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: The estuarine system at Grand Bay National Estuarine Research Reserve in Mississippi is a near pristine wetland home to a diversity of flora and fauna. While seasonal fluctuations in water quality are well understood, less is known about the coupled dynamics of water quality and phytoplankton production. Light availability, nutrient levels, and grazing are key factors regulating phytoplankton. Previous studies have revealed Grand Bay to primarily be limited by nitrogen rather than phosphorus or light. Since then extended phosphate inputs from the neighboring Mississippi Phosphates fertilizer plant have occurred provoking the following question: will the phosphate inputs affect the growth and structure of the phytoplankton communities? This study is investigating the effects of inputs of an array of nutrients (ammonium, nitrate, silicon, and phosphate) on phytoplankton growth, community structure, and production over an annual cycle. Phytoplankton production was monitored as biomass (chlorophyll a concentration) and 14C-bicarbonate fixation. Specific comparisons were made between NH4+ and NO3- to distinguish any preference to different forms of nitrogen (N); however, no preference was observed. Interestingly, the manner in which phytoplankton responded to N additions show that not only is N the limiting nutrient, but that limitation is being exacerbated by excess phosphate (P). Furthermore, this is the first study showing that phytoplankton growth in Bangs Lake was controlled by microzooplankton grazing in all but two months of the study when water temperatures were coolest.
Download or read book Simulating the Effects of Increased Temperature in a Plankton Ecosystem written by Gordon L. Swartzman and published by . This book was released on 1979 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Clean Coastal Waters written by National Research Council and published by National Academies Press. This book was released on 2000-08-17 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental problems in coastal ecosystems can sometimes be attributed to excess nutrients flowing from upstream watersheds into estuarine settings. This nutrient over-enrichment can result in toxic algal blooms, shellfish poisoning, coral reef destruction, and other harmful outcomes. All U.S. coasts show signs of nutrient over-enrichment, and scientists predict worsening problems in the years ahead. Clean Coastal Waters explains technical aspects of nutrient over-enrichment and proposes both immediate local action by coastal managers and a longer-term national strategy incorporating policy design, classification of affected sites, law and regulation, coordination, and communication. Highlighting the Gulf of Mexico's "Dead Zone," the Pfiesteria outbreak in a tributary of Chesapeake Bay, and other cases, the book explains how nutrients work in the environment, why nitrogen is important, how enrichment turns into over-enrichment, and why some environments are especially susceptible. Economic as well as ecological impacts are examined. In addressing abatement strategies, the committee discusses the importance of monitoring sites, developing useful models of over-enrichment, and setting water quality goals. The book also reviews voluntary programs, mandatory controls, tax incentives, and other policy options for reducing the flow of nutrients from agricultural operations and other sources.
Download or read book Aquatic Microbial Ecology written by Jürgen Overbeck and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aquatic microbial ecology, a growing interdisciplinary field, has become increasingly compartmentalized in recent years. The aim of this volume is to propose a framework for biochemical and molecular approaches, which are employed ever more widely in studies of aquatic microbial communities and ecosystem functioning. The book presents state of the art applications of modern molecular research techniques to a range of topics in ectoenzymes microbial carbon metabolism bacterial population dynamics RNA chemotaxonomy of microbial communities plasmids and adaptation to environmental conditions. Written for limnologists, marine biologists, and all researchers interested in environmental microbiology and molecular aspects of ecology, this volume will provide a stimulating introduction to this emerging field.
Download or read book Nutrient Criteria Technical Guidance Manual written by and published by . This book was released on 2000 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Mechanistic Approach to Plankton Ecology written by Thomas Kiørboe and published by Princeton University Press. This book was released on 2018-06-26 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: The three main missions of any organism--growing, reproducing, and surviving--depend on encounters with food and mates, and on avoiding encounters with predators. Through natural selection, the behavior and ecology of plankton organisms have evolved to optimize these tasks. This book offers a mechanistic approach to the study of ocean ecology by exploring biological interactions in plankton at the individual level. The book focuses on encounter mechanisms, since the pace of life in the ocean intimately relates to the rate at which encounters happen. Thomas Kiørboe examines the life and interactions of plankton organisms with the larger aim of understanding marine pelagic food webs. He looks at plankton ecology and behavior in the context of the organisms' immediate physical and chemical habitats. He shows that the nutrient uptake, feeding rates, motility patterns, signal transmissions, and perception of plankton are all constrained by nonintuitive interactions between organism biology and small-scale physical and chemical characteristics of the three-dimensional fluid environment. Most of the book's chapters consist of a theoretical introduction followed by examples of how the theory might be applied to real-world problems. In the final chapters, mechanistic insights of individual-level processes help to describe broader population dynamics and pelagic food web structure and function.
Download or read book Limnology of Lake Champlain written by Glenn E. Myer and published by . This book was released on 1979 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Balance of Power Dissolved Nitrogen to phosphorus Ratios and Phytoplankton Growth Rate Determine the Balance Between Bottom up and Top down Processes in Planktonic Food Webs written by Helena Cornelia Laurentia Klip and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phytoplankton are globally responsible for ~50% of the global oxygen production via primary production, fuelling food webs, and can alter biogeochemical cycles. Grazing forms a massive loss factor of phytoplankton standing stocks. Since it can be challenging to measure variation in these relatively tiny organisms, most studies on planktonic predator-prey interactions overlook variation within groups and populations. It has recently become evident that neither prey populations nor predator populations can be viewed as homogeneous entities. Numerous physiological and behavioural differences can influence how predator-prey interactions act out in both phytoplankton and herbivorous zooplankton. Community organization may be influenced by variation in nutrient stoichiometry, cell quotas, and nutritional requirements and, particularly intraspecific (within-population) variation. I therefore concentrated on nutritional stoichiometry as the changeable trait among populations since the processes driving variation in this trait within populations are different in primary and secondary producers, which can result in mismatch phenomena. A series of grazing dilution experiments using field samples, a growth medium literature review, chemostat experiments, grazing experiments and trait-based approaches were used within this dissertation to investigate on different organisational levels the role of dissolved nitrogen-to-phosphorus ratios and phytoplanktonic growth on the balance between bottom-up and top-down processes in planktonic food webs. The dilution experiments indicated that zooplankton protists (i) actively select between and within phytoplankton and bacterioplankton prey populations, (ii) shift their grazing pressure depending on their nutritional requirements, as both prey items are plastic in their composition, and (iii) play roles in termination of spring phytoplankton and bacterioplankton blooms. The chemostat experiment showed changing stoichiometry as well as lower intercellular trait variability in the faster-growing isogenic phytoplankton populations. As there are multiple ways to grow slowly for phytoplankton, but only one way to grow fast, the recommendation for medium optimisation is a Redfield ratio-correction of the nitrogen-to-phosphorus ratio in future use growth media. The grazing experiments demonstrated that the secondary consumers get impacted by fluctuations in dissolved nitrogen-to-phosphorus ratios (resource quality) and growth rates of their prey. This dissertation provides ultimately more insights in biogeochemical cycling and planktonic trophodynamics with fine-tuning implications for food web models.
Download or read book The Ecology of Phytoplankton written by C. S. Reynolds and published by Cambridge University Press. This book was released on 2006-05-04 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: This important new book by Colin Reynolds covers the adaptations, physiology and population dynamics of phytoplankton communities. It provides basic information on composition, morphology and physiology of the main phyletic groups represented in marine and freshwater systems and in addition reviews recent advances in community ecology.
Download or read book Plankton Ecology written by Ulrich Sommer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Coastal Ecosystems in Transition written by Thomas C. Malone and published by John Wiley & Sons. This book was released on 2020-12-17 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores how two coastal ecosystems are responding to the pressures of human expansion The Northern Adriatic Sea, a continental shelf ecosystem in the Northeast Mediterranean Sea, and the Chesapeake Bay, a major estuary of the mid-Atlantic coast of the United States, are semi-enclosed, river-dominated ecosystems with urbanized watersheds that support extensive industrial agriculture. Coastal Ecosystems in Transition: A Comparative Analysis of the Northern Adriatic and Chesapeake Bay presents an update of a study published two decades ago. Revisiting these two ecosystems provides an opportunity to assess changing anthropogenic pressures in the context of global climate change. The new insights can be used to inform ecosystem-based approaches to sustainable development of coastal environments. Volume highlights include: Effects of nutrient enrichment and climate-driven changes on critical coastal habitats Patterns of stratification and circulation Food web dynamics from phytoplankton to fish Nutrient cycling, water quality, and harmful algal events Causes and consequences of interannual variability The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals. Read a review of this book in Marine Ecology review of this book
Download or read book Coastal Wetlands written by Gerardo M.E. Perillo and published by Elsevier. This book was released on 2009-01-18 with total page 975 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coastal wetlands are under a great deal of pressure from the dual forces of rising sea level and the intervention of human populations both along the estuary and in the river catchment. Direct impacts include the destruction or degradation of wetlands from land reclamation and infrastructures. Indirect impacts derive from the discharge of pollutants, changes in river flows and sediment supplies, land clearing, and dam operations. As sea level rises, coastal wetlands in most areas of the world migrate landward to occupy former uplands. The competition of these lands from human development is intensifying, making the landward migration impossible in many cases. This book provides an understanding of the functioning of coastal ecosystems and the ecological services that they provide, and suggestions for their management. In this book a CD is included containing color figures of wetlands and estuaries in different parts of the world. Includes a CD containing color figures of wetlands and estuaries in different parts of the world.
Download or read book Ecological Dynamics of Tropical Inland Waters written by John Francis Talling and published by Cambridge University Press. This book was released on 1998-12-03 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: A synthesis of tropical freshwater systems which illustrates the basic theory of freshwater biology.
Download or read book Effects of Differential Grazing and Phosphorus Recycling on Phytoplankton Community Dynamics written by Hans J. Hartmann and published by . This book was released on 1987 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Ecology of Freshwater Phytoplankton written by C. S. Reynolds and published by Cambridge University Press. This book was released on 1984-02-02 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This describes the lifestyles of planktons and their adaptation for living independently of solid surfaces.
Download or read book The Structuring Role of Submerged Macrophytes in Lakes written by Erik Jeppesen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rapid growth of the discipline of aquatic ecology has been driven both by scientific interest in the complexities of aquatic ecosystems and by their enormous environmental importance and sensitivity. This book focuses on the remarkably diverse roles played by underwater plants, and is divided into three parts: 10 thematic chapters, followed by 18 case studies, and rounded off by three integrative chapters. The topics range from macrophytes as fish food to macrophytes as mollusc and microbe habitat, making this of interest to aquatic ecologists as well as limnologists, ecosystem ecologists, microbial ecologists, fish biologists, and environmental managers.
