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Author : James Joseph Elser
Publisher :
ISBN 13 :
Total Pages : 510 pages
Book Rating : 4.:/5 (42 download)
Download or read book Nutrients, Algae, and Grazers written by James Joseph Elser and published by . This book was released on 1990 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : William Keith Taulbee
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (63 download)
Download or read book Effects of Light and Nutrients on Algae and Invertebrate Grazers in Streams written by William Keith Taulbee and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anne D. Guerry
Publisher :
ISBN 13 :
Total Pages : 384 pages
Book Rating : 4.:/5 (689 download)
Download or read book Grazing, Nutrients, and Marine Benthic Algae written by Anne D. Guerry and published by . This book was released on 2006 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two of the most powerful ways in which humans have altered ecosystems are by increasing productivity and changing the densities of important consumers. The bottom-up effects of productivity and the top-down effects of consumers have been identified as primary determinants of biological diversity, though the links between them remain unclear. Understanding how consumers and productivity act and interact to yield differences in diversity is of both conceptual and pragmatic importance. Here, I describe three experiments designed to examine the links between grazing, productivity, and diversity in rocky intertidal systems in Oregon and New Zealand. In two experiments I used fully-factorial designs in which I manipulated both grazing and nutrients. Both experiments revealed the primary importance of grazing as a structuring force of algal assemblages. In the Oregon experiment, I also document an interaction between grazing and productivity, with nutrient enrichment decreasing algal diversity at low grazer densities and increasing algal diversity at high grazer densities. This interaction was not apparent in the New Zealand experiment. In the absence of grazers, nutrient addition led to increased abundance of foliose algae at this site but had no net effect on algal diversity. In the third experiment, also conducted in New Zealand, I used natural variation in nearshore productivity as a backdrop against which I manipulated the access of grazers. In this experiment, I found that grazers had negative impacts on benthic algal diversity and abundance at sites with lower productivity and negligible impacts on benthic algal assemblages at sites with higher productivity. Overall these three studies suggest that in these intertidal grazer-dominated communities, the strong top-down effects often documented in such systems can be modified by more subtle bottom-up effects. Together, results from these experiments elucidate factors that determine algal diversity in these systems and underscore the importance of the evolutionary context in which experiments are conducted. Finally, I conclude with a synthesis of the literature in which I put these and other findings to work by exploring the ways in which basic marine ecological research can inform the management of human activities that affect the marine environment.
Author : Tom Andersen
Publisher : Springer Science & Business Media
ISBN 13 : 3662034182
Total Pages : 291 pages
Book Rating : 4.6/5 (62 download)
Download or read book Pelagic Nutrient Cycles written by Tom Andersen and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Michael M. Sturt
Publisher :
ISBN 13 :
Total Pages : 249 pages
Book Rating : 4.:/5 (795 download)
Download or read book The Impacts of Plant Nutrients and Riparian Shade on Primary Producers and Consumers in Lotic Systems written by Michael M. Sturt and published by . This book was released on 2010 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nutrient enrichment is common in Irish streams yet despite extensive reports of algal nutrient requirements, generally, this study found no differences in algal biomass across a wide nutrient gradient. In addition, increases in light levels resulted in no net change in algal biomass. Nevertheless, greater densities of grazing benthic macroinvertebrates (grazers), principally Baetis rhodani, were found in high nutrient, high light streams. The ability of grazers to effectively prevent the accrual of highly productive algae was demonstrated through a series of invertebrate grazer exclusion experiments. These experiments also revealed greater grazing pressures at more nutrient rich sites, presumably a function of greater productivity of the grazers{u2019} algal food source. Top-down grazer control of algae was also shown to be highly variable in time and space. Vigorous algal growth during periods of reduced grazing pressure resulted in rapid accrual of the nuisance filamentous alga Cladophora glomerata. Established filaments developed a degree of grazer resistance and there was evidence that these filaments benefitted from the presence of microphyte grazers, suggesting that grazing pressure can shift between a negative and a positive force depending on algal morphology. High-flow events overrode all other interactions and effectively reduced previously accrued algal biomass to levels near zero yet did not negatively effect grazers. Post-spate algal-invertebrate interactions were subsequently reverted to grazer top-down control. During a prolonged low-flow period, Cladophora in shaded habitats accrued to similar levels as in unshaded habitats. These results indicate that despite light-limited growth, algal biomass can attain similar levels over time in shaded habitats, the threshold of which is governed by flow conditions. This study has demonstrated the dominant roles that small bodied grazers and hydraulic disturbance play in regulating algal standing stock in streams in south-west Ireland. These aspects of stream ecosystem function deserve greater attention from a stream management perspective.
Author : Alan R. Longhurst
Publisher : Elsevier
ISBN 13 : 0080465579
Total Pages : 575 pages
Book Rating : 4.0/5 (84 download)
Download or read book Ecological Geography of the Sea written by Alan R. Longhurst and published by Elsevier. This book was released on 2010-08-03 with total page 575 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents an in-depth discussion of the biological and ecological geography of the oceans. It synthesizes locally restricted studies of the ocean to generate a global geography of the vast marine world.Based on patterns of algal ecology, the book divides the ocean into four primary compartments, which are then subdivided into secondary compartments.*Includes color insert of the latest in satellite imagery showing the world's oceans, their similarities and differences*Revised and updated to reflect the latest in oceanographic research*Ideal for anyone interested in understanding ocean ecology -- accessible and informative
Author : Kent W. Thornton
Publisher : John Wiley & Sons
ISBN 13 : 9780471885016
Total Pages : 262 pages
Book Rating : 4.8/5 (85 download)
Download or read book Reservoir Limnology written by Kent W. Thornton and published by John Wiley & Sons. This book was released on 1991-01-16 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: Addresses reservoirs as unique ecological systems and presents research indicating that reservoirs fall into two or three highly concatenated, interactive ecological systems ranging from riverine to lacustrine or hybrid systems. Includes some controversial concepts about the limnology of reservoirs, which make for interesting reading.
Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309069483
Total Pages : 422 pages
Book Rating : 4.3/5 (9 download)
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.
Author : Chandrakasan Sivaperuman
Publisher : Academic Press
ISBN 13 : 0128130652
Total Pages : 808 pages
Book Rating : 4.1/5 (281 download)
Download or read book Biodiversity and Climate Change Adaptation in Tropical Islands written by Chandrakasan Sivaperuman and published by Academic Press. This book was released on 2018-04-05 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biodiversity and Climate Change Adaptation in Tropical Islands provides comprehensive information on climate change, biodiversity, possible impacts, adaptation measures and policy challenges to help users rehabilitate and preserve the natural resources of tropical islands. While biodiversity and climate change of tropical islands has previously received less attention, it is ironically one of the most vulnerable regions in this regard. The core content of the work derives largely from the ideas and research output from various reputed scientists and experts who have recorded climate change impacts on aquatic and coastal life in tropical regions. Contributors have direct working experience with the tribes in some of the tropical islands. All of their expertise and information is compiled and presented in the work, including coverage related to climate change. This work highlights the ever-growing need to develop and apply strategies that optimize the use of natural resources, both on land and in water and judicious use of biodiversity. It functions as a critical resource on tropical island biodiversity for researchers, academicians, practitioners and policy makers in a variety of related disciplines. - Covers a huge range of biodiversity documentation, conservation measures and strategies that can be applied to various sectors, from forests to agriculture - Brings together expertise from researchers in the area who have direct experience in the regions described - Contains a wealth of field research related to biodiversity conservation and its applications from a variety of tropical islands
Author : Walter H. Adey
Publisher : Elsevier
ISBN 13 : 0080469108
Total Pages : 556 pages
Book Rating : 4.0/5 (84 download)
Download or read book Dynamic Aquaria written by Walter H. Adey and published by Elsevier. This book was released on 2011-08-29 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: In its third edition, this praised book demonstrates how the living systems modeling of aquatic ecosystems for ecological, biological and physiological research, and ecosystem restoration can produce answers to very complex ecological questions. Dynamic Aquaria further offers an understanding developed in 25 years of living ecosystem modeling and discusses how this knowledge has produced methods of efficiently solving many environmental problems. Public education through this methodology is the additional key to the broader ecosystem understanding necessary to allow human society to pass through the next evolutionary bottleneck of our species. Living systems modeling as a wide spectrum educational tool can provide a primary vehicle for that essential step. This third editon covers the many technological and biological developments in the eight plus years since the second edition, providing updated technological advice and describing many new example aquarium environments. - Includes 16 page color insert with 57 color plates and 25% new photographs - Offers 300 figures and 75 tables - New chapter on Biogeography - Over 50% new research in various chapters - Significant updates in chapters include: - The understanding of coral reef function especially the relationship between photosynthesis and calcification - The use of living system models to solve problems of biogeography and the geographic dispersal and interaction of species populations - The development of new techniques for global scale restoration of water and atmosphere - The development of new techniques for closed system, sustainable aquaculture
Author : John H. Lancaster
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.E/5 ( download)
Download or read book Algal Nutrition written by John H. Lancaster and published by . This book was released on 1962 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advent of space travel has been accompanied by an increased appreciation of the algae as organisms which are of use to man. These organisms, when grown on human wastes, hold promise of serving as gas exchangers, waste disposers, and food sources for crew members of space vehicles.
Author :
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.3/5 ( download)
Download or read book Protocol for Developing Nutrient TMDLs written by and published by . This book was released on 1999 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rathinam Raja
Publisher : CRC Press
ISBN 13 : 1000457109
Total Pages : 294 pages
Book Rating : 4.0/5 (4 download)
Download or read book Algae for Food written by Rathinam Raja and published by CRC Press. This book was released on 2021-10-25 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Algae for Food: Cultivation, Processing and Nutritional Benefits Algae are a primitive, living photosynthetic form and they are the oldest living organism. In the marine ecosystem, algae are the primary producers that supply energy required to a diverse marine organism and especially seaweed provides a habitat for invertebrates and fishes. There have been significant advances in many areas of phycology. This book describes the advances related to food and nutrition of algae achieved during the last decades, it also identifies gaps in the present knowledge and needs for the future. The 17 chapters, grouped into 6 parts, are written by phycologists. More insight on industrial exploitation of algae and their products is supported by current studies and will help academia. The first part explains new technologies to improve the microalgal biomass, strain improvement and different methods of seaweed cultivation. In the second part, food and nutraceutical applications of algae, food safety aspects, green nanotechnology and formulation methods for the extraction and isolation of algal functional foods are described. The third part deals with pigments and carotenoids while the fourth part exploits the isolation and application of hydrocolloids, nutritional implications of algal polysaccharides and the characterization and bioactivity of fucoidans. In the fifth part, the biomedical potential of seaweed followed by agricultural applications of algae are well described. The book is an important resource for scholars that provides knowledge on wide range of topics. Key Features Covers important fields of algae from biomass production to genetic engineering aspects of algae Useful in the field of algal biotechnology, aquaculture, marine micro and macrobiology, microbial biotechnology and bioprocess technology Focuses on the therapeutic and nutritional areas of algae
Author :
Publisher :
ISBN 13 :
Total Pages : 258 pages
Book Rating : 4.3/5 (121 download)
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:
Author : J. David Allan
Publisher : Springer Science & Business Media
ISBN 13 : 1402055838
Total Pages : 444 pages
Book Rating : 4.4/5 (2 download)
Download or read book Stream Ecology written by J. David Allan and published by Springer Science & Business Media. This book was released on 2007-08-17 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Food and Agriculture Organization of the United Nations
Publisher : Food & Agriculture Org.
ISBN 13 : 9251305625
Total Pages : 227 pages
Book Rating : 4.2/5 (513 download)
Download or read book The State of World Fisheries and Aquaculture 2018 written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2018-07-10 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2018 edition of The State of World Fisheries and Aquaculture emphasizes the sector’s role in achieving the 2030 Agenda for Sustainable Development and the Sustainable Development Goals, and measurement of progress towards these goals. It notes the particular contributions of inland and small-scale fisheries, and highlights the importance of rights-based governance for equitable and inclusive development. As in past editions, the publication begins with a global analysis of trends in fisheries and aquaculture production, stocks, processing and use, trade and consumption, based on the latest official statistics, along with a review of the status of the world’s fishing fleets and human engagement and governance in the sector. Topics explored in Parts 2 to 4 include aquatic biodiversity; the ecosystem approach to fisheries and to aquaculture; climate change impacts and responses; the sector’s contribution to food security and human nutrition; and issues related to international trade, consumer protection and sustainable value chains. Global developments in combating illegal, unreported and unregulated fishing, selected ocean pollution concerns and FAO’s efforts to improve capture fishery data are also discussed. The issue concludes with the outlook for the sector, including projections to 2030. As always, The State of World Fisheries and Aquaculture aims to provide objective, reliable and up-to- date information to a wide audience, including policy-makers, managers, scientists, stakeholders and indeed all those interested in the fisheries and aquaculture sector.
Author :
Publisher : Academic Press
ISBN 13 : 0080526942
Total Pages : 781 pages
Book Rating : 4.0/5 (85 download)
Download or read book Algal Ecology written by and published by Academic Press. This book was released on 1996-06-03 with total page 781 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
