Download or read book Implications of Phytoplanktonic Light Limitation in Stratified Lakes with Contrasting Dissolved Organic Carbon Content written by David L. Christensen and published by . This book was released on 1995 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissolved Organic Carbon in Lakes written by Jeffrey Neil Houser and published by . This book was released on 2001 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impact of dissolved organic carbon phosphorus and grazing on phytoplankton biomass and production in experimental lakes written by S.R. CARPENTER and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aquatic Humic Substances written by Dag Hessen and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Humic substances occur in all kinds of aquatic systems, but are particularly important in northern, coniferous areas. They strongly modify the aquatic ecosystems and also constitute a major problem in the drinking water supply. This volume covers all aspects of aquatic humic substances, from their origin and chemical properties, their effects on light and nutrient regimes and biogeochemical cycling, to their role regarding organisms, productivity and food web organization from bacteria to fish. Special emphasis is paid to carbon cycling and food web organization in humic lakes, but aspects of marine carbon cycling related to humus are treated as well.
Download or read book Chlorophyll a Fluorescence in Aquatic Sciences Methods and Applications written by David J. Suggett and published by Springer Science & Business Media. This book was released on 2010-08-23 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of variable chlorophyll fluorescence have revolutionised global research of photosynthetic bacteria, algae and plants and in turn assessment of the status of aquatic ecosystems, a success that has partly been facilitated by the widespread commercialisation of a suite of chlorophyll fluorometers designed for almost every application in lakes, rivers and oceans. Numerous publications have been produced as researchers and assessors have simultaneously sought to optimise protocols and practices for key organisms or water bodies; however, such parallel efforts have led to difficulties in reconciling processes and patterns across the aquatic sciences. This book follows on from the first international conference on “chlorophyll fluorescence in the aquatic sciences” (AQUAFLUO 2007): to bridge the gaps between the concept, measurement and application of chlorophyll fluorescence through the synthesis and integration of current knowledge from leading researchers and assessors as well as instrument manufacturers.
Download or read book The Effects of Dissolved Organic Carbon on Pathways of Energy Flow Resource Availability and Consumer Biomass in Nutrient poor Boreal Lakes written by Joseph Tonin and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past few decades, terrestrially derived dissolved organic carbon (DOC) has been recognized as a fundamental driver of food web productivity in nutrient poor lakes. The mechanisms that underlie these effects remain poorly understood, particularly for higher trophic levels including zooplankton, benthic invertebrates, and fish. In a survey of eight lakes in northwestern Ontario, I determined consumer biomass and used stable isotopes of carbon, nitrogen, and hydrogen to investigate relationships between DOC and pathways of energy flow, resource and habitat availability, and consumer biomass. Using Bayesian stable isotope mixing models, I found that hypolimnetic phytoplankton were an important resource for zooplankton in low-DOC lakes. With increased DOC concentrations, light attenuation increased and chlorophyll a concentrations below the thermocline were reduced relative to epilimnetic concentrations. At higher DOC concentrations, zooplankton acquired proportionately more energy from low quality terrestrial sources. Zooplankton biomass also declined with increasing utilization of terrestrial sources (allochthony), suggesting that terrestrial organic matter suppresses zooplankton productivity through simultaneous limitations on habitat and resource availability and quality. Based on biomass, the dominant fish species across my study lakes was White Sucker (Catostomus commersonnii). Bayesian mixing models indicated that allochthony by White Suckers increased with DOC and that greater allochthony was related to lower White Sucker biomass measured as catch-per-unit-effort (bCPUE). Both White Sucker bCPUE and chironomid biomass were positively related to mean light irradiance, with the highest biomasses of fish and chironomids occurring in lakes with a higher proportion of their volume in the photic zone. White Sucker bCPUE was strongly and positively correlated with chironomid biomass, suggesting that DOC-mediated resource limitation may influence fish productivity via reduced prey availability.
Download or read book Interactive Effects of Temperature Nutrient Availability and Dissolved Organic Carbon Concentrations on the Response of Alpine Phytoplankton Population Growth to Ultraviolet Radiation written by Shaina A. Doyle and published by . This book was released on 2005 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Increasing Atmospheric Nitrogen Deposition and Dissolved Organic Matter on Phytoplankton in Boreal Lakes with Differing Nutrient Limitation Patterns written by Carmen Daggett and published by . This book was released on 2011 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Method to Estimate Chlorophyll a Concentration in the Surface Layer of a Stratified Lake from Surface Layer Temperature Time Series Meteorogical Fluxes a Knowledgeof Blue to red Peak Absorption Ratio and Dissolved Organic Matter Concentration written by Sri Adiyanti and published by . This book was released on 2008 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: In maintaining lake water quality, primary productivity has been a growing interest to lake managers for many years. One commonly used primary productivity parameter is chlorophyll-a (chl a) concentration as a proxy for phytoplankton population, which may vary diurnally. A practical, calibration-less, cost-effective, non-labour intensive method and yet capable producing a real-time and accurate chl a concentration is important. This study aims to provide an alternative method to estimate chl a concentration in the surface layer of a stratified lake using surface layer temperature time series data and meteorological fluxes (physical properties), as well as a knowledge of the blue-to-red peak absorption ratio, the dissolved organic matter concentration and relative composition of four major phytoplankton groups (biological properties). The intention of the method is to produce a better resolution of chl a concentration in between biological properties measurements; hence it can minimize the monitoring cost to produce a time series of chl a concentration. The method consists of a model which derives the light attenuation coefficient from surface layer temperature time series data and water surface flux measurements, and a model that relates the light attenuation coefficient to the total chl a concentration in the surface layer. The one-dimensional surface mixed-layer model, which is the base of the first model, was tested under wind-dominated deepening events in Lake Como (Italy) during which the surface layer deepened as a onedimensional slab-like layer. The simulated and observed surface layer deepening characteristics are shown to agree well over conditions characterized by a range of Richardson number from O(10-1) to O(102). The test was also conducted under lowwind stratifying condition, which is one of the necessary criteria for the method. In the second model, phytoplankton absorption spectra are assumed to vary as a function of the community structure, which distinguishes the method from other similar approaches. The method was valid for cases where the horizontal pressure gradient in the surface layer was negligible, the photic depth was deeper than the diurnal surface layer and the increment in temperature in photic region was considerably larger than the thermistor's precision. The method was validated using data sets measured in Lake Kinneret (Israel), Valle de Bravo (Mexico), and Winamp Gulf (Kenya). The estimated values of the light attenuation coefficient (first model) and the total chl a concentration (second model) were mostly within 10% error of the actual direct measurements. The dissolved organic matter concentration is a critical parameter for the method; hence it is important to have good estimates of this parameter. The method uses fresh phytoplankton footprint (i.e. accumulation of heat), therefore it is useful for a quick assessment of the total chl a concentration in a water body of interest. The sensitivity analyses, possible improvement, as well as the application of the method as a management tool are discussed.
Download or read book Algal Toxins Nature Occurrence Effect and Detection written by Valtere Evangelista and published by Springer Science & Business Media. This book was released on 2008-06-27 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the lectures and seminars given at the NATO Advanced Study Institute on “Sensor Systems for Biological Threads: The Algal Toxins Case”, held in Pisa, Italy in October, 2007. The Institute was sponsored and funded by the Scientific Affairs Division of NATO. It is my pleasant duty to thank this institution. This ASI offered updated information on how far the research on algal toxins has gone in the exploration of structures, biosynthesis and regulation of toxins, and the development of technology for bio-monitoring these c- pounds. Algae can form heavy growths in ponds, lakes, reservoirs and sl- moving rivers throughout the world; algae can house toxins which are - ually released into water when the cells rupture or die. Hundreds of toxins have been identified so far. Detection methods, including rapid screening, have been developed to help us learning more about them, especially to find out which toxins are a real threat for people and what conditions encourage their production and accumulation. Early detection of algal toxins is an - portant aspect for public safety and natural environment, and significant efforts are underway to develop effective and reliable tools that can be used for this purpose.
Download or read book The Dissolved Organic Carbon Released from Lake Phytoplankton written by Ingvar Sundh and published by . This book was released on 1991 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wetzel s Limnology written by Ian D. Jones and published by Elsevier. This book was released on 2023-09-16 with total page 1105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wetzel’s Limnology: Lake and River Ecosystems, Fourth Edition, presents a fully updated revision of the classic textbook Limnology: Lake and River Ecosystems - last published in 2001. The coverage has been thoroughly updated with recent research and theoretical developments. Each chapter of this edited volume has been written by an expert, or team of experts, providing a comprehensive and global perspective, with the editors working closely with the authors to maintain continuity within and between the chapters. This is not only an essential textbook for undergraduate and graduate students in limnology but also a standard reference book for seasoned limnologists and other scientists. Chapters from the third edition have been updated by an international team of experts, incorporating developments from the past two decades Several new chapters have been added, reflecting exciting developments in the field of limnology New color illustrations and images throughout Detailed summaries at the end of each chapter
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Harmful Cyanobacteria written by Jef Huisman and published by Springer Science & Business Media. This book was released on 2005-06-15 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: This outstanding volume provides an up-to-date overview of the advances in our knowledge of harmful cyanobacteria. An essential reference for all scientists and environmental professionals interested in cyanobacterial ecology and water management.
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 North Sea Region Climate Change Assessment written by Markus Quante and published by Springer. This book was released on 2016-08-31 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers an up-to-date review of our current understanding of climate change in the North Sea and adjacent areas, as well as its impact on ecosystems and socio-economic sectors. It provides a detailed assessment of climate change based on published scientific work compiled by independent international experts from climate-related disciplines such as oceanography, atmospheric sciences, marine and terrestrial ecology, using a regional evaluation and review process similar to that of the Intergovernmental Panel on Climate Change (IPCC). It provides a comprehensive overview of all aspects of our changing climate, discussing a wide range of topics including past, current and future climate change, and climate-related changes in marine, terrestrial and freshwater ecosystems. It also explores the impact of climate change on socio-economic sectors such as fisheries, agriculture, coastal zone management, coastal protection, urban climate, recreation/tourism, offshore activities/energy, and air pollution.
Download or read book Photosynthesis in Algae Biochemical and Physiological Mechanisms written by Anthony W.D. Larkum and published by Springer Nature. This book was released on 2020-06-03 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: Algae, including cyanobacteria, are in the spotlight today for a number of reasons; firstly it has become abundantly clear over recent years that algae have been neglected in terms of basic research and that knowledge gap is being rapidly closed with the establishment of some surprising discoveries, such as the presence of Near-Infra-Red-Absorbing cyanobacteria and a wealth of natural products; secondly molecular approaches have provided a wealth of approaches to genetically modify algae and produce value-added products; thirdly it has become clear just how important, marine phytoplankton is to global carbon capture and the production of food globally; and fourthly, it has also become clear that algae present unparalleled opportunities to generate biofuels in a sustainable and non-polluting way. This volume presents 15 chapters by world experts on their subjects, ranging from reviews of algal diversity and genetics to in-depth reviews of special algal groups such as diatoms (which account for over 30% of marine carbon capture). Other chapters chart the ways in which this carbon capture occurs or how there are a multiplicity of ways in which algae intercept sun light and deploy this energy for carbon capture. A fascinating aspect here is the way in which sun light is harvested. A special chapter is devoted to the very recent and exciting possibility that algae use coherent light energy transformation to enhance the efficiency of light capture, an aspect of quantum physics that has implications for future developments at several levels and a variety of industries. Just how and why algae use Chlorophyll a as the major light capture pigment is discussed in several chapters. However, attention is also given to those cyanobacteria, which have been found to use the special Near-Infra Red absorbing chlorophylls mentioned above. And attention is also given to those algae that employ phycobiliproteins to fill in the “green window”, i.e., the spectral region from 400 – 650 nm, which is not efficiently covered by chlorophyll and carotenoid pigments. Photoinhibition and photoprotection is the subject area of several chapters and one which it is essential to understand a we work towards greater efficiency of algal photosynthesis. A final chapter is devoted to understanding the molecular basis for coral bleaching, a much-neglected area that is essential in trying to come up with solutions to this very worrying phenomenon, caused by global warming and ocean acidification. This is a book for research scientists, environmentalists, planners in a range of areas including those of marine resources, nutrient control and pollution of water bodies and that growing body of concerned citizens interested in controlling carbon emissions and global warming. Special attention has been given to generating a set of articles that will be read by university students, informed laymen and all those whose wish to understand the rapid changes that have come about in our knowledge of algae over the past decade.
