Download or read book The Effects of Irradiance on Nitrate Uptake and Dissolved Organic Nitrogen Release by Phytoplankton in the Ross Sea written by Shuhua Hu and published by . This book was released on 1996 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Irradiance on Nitrate Uptake and Dissolved Organic Nitrogen Release by Phytoplankton in the Ross Sea written by Shuhua Hu and published by . This book was released on 1996 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biogeochemistry of Marine Dissolved Organic Matter written by Dennis A. Hansell and published by Elsevier. This book was released on 2024-07-04 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biogeochemistry of Marine Dissolved Organic Matter, 3rd edition is the most up-to-date revision of the fundamental reference for the biogeochemistry of marine dissolved organic matter. Since its original publication in June 2002, the science, questions, and priorities have advanced, and the editors of this essential guide, have added nine new chapters, including one on the South China Sea. An indispensable manual edited by the most distinguished experts in the field, this book is addressed to graduate students, marine scientists, and all professionals interested in advancing their knowledge of the field. Features up-to-date knowledge on DOM, including 9 new chapters Presents the only published work to synthesize recent research on dissolved organic carbon in the South China, a region receiving a great deal of attention in recent decades Offers contributions by world-class research leaders
Download or read book Nitrogen in the Marine Environment written by Douglas G. Capone and published by Elsevier. This book was released on 2008-08-15 with total page 1759 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the first edition of Nitrogen in the Environment published in 1983, it has been recognized as the standard in the field. In the time since the book first appeared, there has been tremendous growth in the field with unprecedented discoveries over the past decade that have fundamentally changed the view of the marine nitrogen cycle. As a result, this Second Edition contains twice the amount of information as contained in the first edition. This updated edition is now available online, offering searchability and instant, multi-user access to this important information. *The classic text, fully updated to reflect the rapid pace of discovery*Provides researchers and students in oceanography, chemistry, and marine ecology an understanding of the marine nitrogen cycle*Available online with easy access and search - the information you need, when you need it
Download or read book US Southern Ocean JGOFS Program AESOPS written by and published by . This book was released on 2000 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Southern Ocean II written by Paul Tréguer and published by . This book was released on 2002 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissolved Organic Nitrogen Dynamics and Influence on Phytoplankton written by Grigorios Moschonas and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nitrogen Uptake by Phytoplankton in Coastal and Offshore Waters written by Elisabeth Sahlsten and published by . This book was released on 1987 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The microbial nitrogen cycle written by Bess B Ward and published by Frontiers Media SA. This book was released on 2015-01-17 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen is an essential element in biological systems, and one that often limits production in both aquatic and terrestrial systems. Due to its requirement in biological macromolecules, its acquisition and cycling have the potential to structure microbial communities, as well as to control productivity on the ecosystem scale. In addition, its versatile redox chemistry is the basis of complex biogeochemical transformations that control the inventory of fixed nitrogen, both in local environments and over geological time. Although many of the pathways in the microbial nitrogen cycle were described more than a century ago, additional fundamental pathways have been discovered only recently. These findings imply that we still have much to learn about the microbial nitrogen cycle, the organisms responsible for it, and their interactions in natural and human environments. Progress in nitrogen cycle research has been facilitated by recent rapid technological advances, especially in genomics and isotopic approaches. In this Research Topic, we reviewed the leading edge of nitrogen cycle research based on these approaches, as well as by exploring microbial processes in modern ecosystems.
Download or read book FLUXMANCHE II written by and published by . This book was released on 1999 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Release of UV absorbing Compounds by Marine Phytoplankton and Their Effect on the Absorption Properties of Particulate and Dissolved Organic Matter written by Kenia Whitehead and published by . This book was released on 1996 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Production of dissolved organic nitrogen during uptake of nitrate by Synedra planctonica written by Y. COLLOS and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Exploring Light Controls on Phytoplankton Community Structure and the Biogeochemistry of the Ross Sea Antarctica written by Lindsey Rae Kropuenske and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Southern Ocean is one of the most important regions on Earth for absorption of anthropogenic carbon dioxide (CO2) from the atmosphere and long-term storage of that carbon in deep water and ocean sediments. While a significant amount of CO2 enters the deep ocean in this region along oceanographic fronts through the solubility pump, large seasonal phytoplankton blooms form on the Antarctic continental shelf and suggest that the biological pump also plays an important, and possibly underestimated, role in the oceanic sequestration of atmospheric CO2. This dissertation investigates the mechanisms by which light may control phytoplankton species distributions in one of the most productive areas of the Antarctic continental shelf, the Ross Sea. The Ross Sea is commonly dominated by two major phytoplankton species, diatoms, and the haptophyte, Phaeocystis antarctica. The distributions of these species are often correlated with different mixed layer environments, with diatoms dominating shallow mixed layers and P. antarctica dominating deeper mixed layers. Using a series of laboratory experiments, differences were assessed between P. antarctica and the common Ross Sea diatom, Fragilariopsis cylindrus, in their capacity for xanthophyll cycle photoprotection (Chapter 2). This was followed by chemical inhibition experiments that quantified the relative important of xanthophyll cycle photoprotection and the repair of photodamage for maintaining photosynthetic performance in each species. F. cylindrus produced significantly higher concentrations of xanthophyll cycle pigment and epoxidation of activated pigment (diatoxanthin epoxidation to diadinoxanthin) occurred much more slowly upon transition to low light than in P. antarctica. Although both species relied on xanthophyll cycle photoprotection to avoid photoinhibition and maintain maximal photosynthetic rates, P. antarctica was much more adversely affected when repair of photodamage was inhibited. Differences between species in strategies and rates of photoacclimation were also assessed (Chapter 3). F. cylindrus acclimated to shifts in irradiance by adjusting photosynthetic efficiency, with large changes in the functional absorption cross-section of photosystem two ([sigma]PSII) inferred from physiological measurements. P. antarctica exhibited significant changes in both photosynthetic efficiency and the maximum capacity for photosynthesis following shifts in irradiance. Changes in both [sigma]PSII and the number photosynthetic reaction centers or their maximum turnover rate were inferred from physiological measurements. Light was also found to play an important role in controlling elemental ratios in F. cylindrus and P. antarctica (Chapter 4). Particulate organic carbon to nitrogen to phosphorus ratios (C:N:P) varied as a function of growth irradiance in both species, but significant differences between species grown in identical conditions were also observed. F. cylindrus exhibited C:N:P ratios that were significantly lower than those of P. antarctica and often below the Redfield ratio, in agreement with observations from the Ross Sea. In contrast, P. antarctica exhibited ratios above the Redfield ratio when grown in all but very high light conditions. While protein, nucleic acid, and chlorophyll (Chl) concentrations explained the provenance of nearly 100% of particulate N in both species, nucleic acid concentrations were not sufficient to explain particulate P in either species. The remaining P could be partially accounted for if these species produce large concentrations of phospholipids, but storage of inorganic P most likely forms the largest cellular P-pool in nutrient replete cultures. Finally, data from the laboratory experiments were used to calculate phytoplankton growth rates in an ecosystem model of the Ross Sea to test the hypothesis that photophysiological differences between diatoms and P. antarctica can explain their distributions (Chapter 5). The phytoplankton growth model was modified from a previous steady-state model that included four physiological variables, the maximum quantum yield of photosynthesis ([phi]M), the irradiance at which [phi] = 1/2 [phi]M, the carbon to Chl ratio, and mean Chl-specific absorption. The parameters were allowed to vary as a function of mean mixed layer irradiance according to equations derived from laboratory data and acclimation rates measured in light shift experiments. Chl concentrations and distributions of P. antarctica and diatoms in the model agreed well with field observations, demonstrating that light is sufficient to explain phytoplankton community composition in the Ross Sea. These results also demonstrate that physiological information collected from ecologically relevant algal cultures can be used to understand and model phytoplankton dynamics in the natural environment.
Download or read book Modeling Gassy Sediment Structure and Behavior written by Michael D. Richardson and published by . This book was released on 1998 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book written by and published by . This book was released on 1998 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photosynthetic Response and Nutrient Uptake Dynamics of Phytoplankton in the Ross Sea Antarctica written by Christina Marie Van Hilst and published by . This book was released on 2000 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Pelagic Cyanobacteria Trichodesmium and other Diazotrophs written by E.J. Carpenter and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: Planktonic marine cyanobacteria are abundant and significant in the biogeochemistry of the sea. This volume focuses on the filamentous cyanobacteria, particularly those in the genus Trichodesmium which are common in tropical and subtropical seas. A portion of this book also concerns bloom-forming cyanobacteria in the Baltic Sea area. Filamentous cyanobacteria are important as primary producers and for the fixation of atmospheric nitrogen and thus are significant in global cycling of both of these elements. In recent years, through the application of new techniques and intensive multi-disciplinary research programs, progress has been made in understanding both the biology of these cyanobacteria and their place in the marine food web. A broad range of topics is covered in this book, ranging from molecular biology, physiology, ultrastructure, enzyme localization, toxicology, remote sensing, buoyancy, herbivory and the ecology of these organisms in the marine food web. This volume is an outgrowth of a NATO-sponsored meeting held in May 1991 in Bamberg, Germany, and represents the latest synthesis on these marine phytoplankters.
