Download or read book Effects of Cultural Eutrophication on Benthic Algae Density in an Oligotrophic Alpine Lake Lake Tahoe CA NV written by Brenda Schweitzer and published by . This book was released on 2000 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Eutrophication of Surface Waters written by Lake Tahoe Area Council and published by . This book was released on 1975 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Eutrophication of Surface Waters written by Lake Tahoe Area Council and published by . This book was released on 1975 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Eutrophication of Lake Tahoe Emphasizing Water Quality written by Charles Remington Goldman and published by . This book was released on 1974 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Error and Variability in Metabolism Estimates from a Stratified Oligotrophic Lake Lake Tahoe CA NV written by Amelia Jones and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Many lakes are experiencing measureable declines in dissolved oxygen (DO) concentrations due to increased oxygen demand caused by urbanization and nutrient pollution. Ecosystem metabolism can inform impacts of this cultural eutrophication, as well as a number of other critical ecosystem interactions. In this study, high-frequency water temperature and free water DO (FWDO) observations were used in two models (an oxygen mass balance model and a Bayesian statistical model, jointly referred to as the FWDO methods) to estimate depth-integrated metabolism at Lake Tahoe over 18 months. These estimates were evaluated against highly accurate measurements of metabolism generated with the 14C bottle incubation method at the same study site. 14C measurements and ecological, meteorological and hydrological data regularly collected at Lake Tahoe were used to supplement modeled metabolism estimates, analyze sources of estimate error, and characterize metabolism variability. The results of this study suggest that while values produced from the various metabolism measurement and estimation methods differ, this estimate error is potentially a product of seasonal changes in water column stability and mixed layer depth. Out of all the ecosystem variables explored in this study, water column stability had the strongest positive correlation with metabolism estimate error. Seasonal and interannual patterns in water column stability and mixed layer depth also track variability in metabolic rate components, indicating that the same variables that may obfuscate estimate accuracy also influence metabolism variability. Following continued collection of high-frequency data, these results will benefit from additional multivariate analysis to parse out the influence of seasonal drivers such as photosynthetically active radiation and water temperature. Despite differences, the FWDO methods are favored over the 14C measurements for their ability to autonomously capture ecosystem dynamics at a much higher temporal resolution.
Download or read book Eutrophication of Surface Waters Lake Tahoe written by Percy Harold McGauhey and published by . This book was released on 1972 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: A survey was made of nutrient and other chemical constituents of surface waters from developed and undeveloped land areas, sewage effluents, seepage from septic tank percolation system and refuse fills, drainage from swamps, precipitation, and Lake Tahoe water. Algal growth stimulating potential of the samples were bioassayed with Selenastrum gracile as a test organism. Algal response to nutrients was measured by maximum growth rate and maximum cell count in a 5-day growth period. Ponds simulating the shallow portions of the lake were used for continuous flow assay of the biomass of indigenous lake organisms produced by sewage effluent. Flask assays and chemical analyses were made over two years on three major creeks. Twenty-eight other creeks and precipitations were monitored by chemical analysis. Evaluating the eutrophication potential, Lake Tahoe is nitrogen sensitive and responds to it in proportion to its concentration.
Download or read book Eutrophication a Review written by Kenton M. Stewart and published by . This book was released on 1967 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Aeration circulation as a Lake Restoration Technique written by Robert A. Pastorok and published by . This book was released on 1981 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Artificial circulation and hypolimnetic aeration are management techniques for oxygenating eutrophic lakes subject to water quality problems, algal blooms, and fishkills. Artificial circulation is achieved by injecting diffused air into lower waters, by mechanical pumping of water from one depth stratum to another, or by inducing turbulence at the surface using large axial-flow pumps. In contrast, hypolimnetic aeration by air or oxygen injection affects primarily bottom waters. In some instances low dissolved oxygen concentrations persist in the metalimnion. In general, both methods lower the concentrations of reduced compounds in lake waters, providing benefits for water supply systems. Aeration may cause supersaturation of nitrogen gas, thereby raising the potential danger of gas bubble disease in downstream fishes.
Download or read book Eutrophication of Surface Waters Lake Tahoe Indian Creek Reservoir written by Percy Harold McGauhey and published by . This book was released on 1971 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: The water impounded at Indian Creek Reservoir near Lake Tahoe, California is approximately one-third surface runoff and direct precipitation and two-thirds reclaimed water exported from South Tahoe Public Utility District Plant. Discussed are the results of tests which determined the temporal changes and relationships between water quality characteristics of Indian Creek Reservoir and those of the reclaimed water. Initially the reservoir would not support fish life, but as the reservoir matured, ammonia levels declined to less than 4 mg/l and by 1970 it was an excellent trout fishery. Approximately 70% of the ammonia nitrogen was lost to the atmosphere by nitrification-denitrification. Good biological productivity indicated access to other phosphorus sources, probably runoff. Relative to conductivity and chemical components the water is of good irrigation quality. Various parameters showed that the reservoir responds to more complex factors than those measurable in the reclaimed waste water, raising the question of the effectiveness of tertiary treatment for recreational impoundments.
Download or read book Modeling and Managing Shallow Lake Eutrophication written by Laszlo Somlyody and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the late 1970s. the adverse effects of man-made eutrophication became manifest in many countries. which explains. perhaps. why there was such a broad interest when the former Resources and Environment Area of the International Institute for Applied Systems Analysis (IIASA) organized a workshop on the subject. There was such an enthusiasm among the partici pants that two further workshops were quickly organized. one on deep and the other on shallow lake eutrophication problems. The organization of these meetings was extremely stimulating. and the round table discussions among scientists from both West and East remain thought provoking for those who took part. The general feeling emerged that the complexity and multifaceted nature of the problem, even though perhaps not fully recognized at that time. clearly demanded a systems analysis approach. No wonder. then. that the request made by the Hungarian Member Organization of nASA to adopt Lake Balaton as a "real life laboratory" for an nASA case study fell on fertile ground. the more so since it appeared that shallow lake eutrophication had received less attention and was less well understood than that of deep lakes. And so the nASA Lake Balaton Case Study began. with the appointment of Gerrit van Straten as the first leader of the project.
Download or read book Eutrophication of Shallow Lakes with Special Reference to Lake Taihu China written by B. Qin and published by Springer Science & Business Media. This book was released on 2007-12-03 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume features papers presented at the International Symposium on the Eutrophication Process and Control in Large Shallow Lakes-–with Special Reference to Lake Taihu, held in Nanjing, China in April 2005. Coverage includes: physical processes and their effects on shallow lake ecosystems; biogeochemistry of sediments and nutrient cycling in shallow lakes; and algal blooms and ecosystem response in shallow lakes.
Download or read book The Algal Bowl written by John R. Vallentyne and published by . This book was released on 1974 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives information about lakes and explains how they are affected by nutrients derived from human activities.
Download or read book An Appraisal of the Potential for Cultural Eutrophication of Tocks Island Lake written by Jack McCormick & Associates and published by . This book was released on 1971 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Spatially and Temporally Heterogeneous Disturbance on Benthic Nearshore Biota in Large Deep Oligotrophic Lakes written by Michael Frederick Meyer and published by . This book was released on 2021 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ecosystem integrity is threatened by disturbance from human activities. Although disturbances can take many different forms, human disturbances are inherently heterogeneous, as these disturbances tend to occur where and when people are present. This inherent spatio-temporal heterogeneity means that we can investigate how independent and intersecting spatial and temporal components of ecological disturbances can influence biotic communities. Wastewater released into aquatic systems is an example of a high-impact human disturbance that can reshape aquatic communities. Algal communities, especially in oligotrophic lakes, can rapidly assimilate nutrients, causing increased biomass and altered resources for grazers, which may likewise relocate or adjust behavior and physiology to compensate. Despite seeming straightforward, associating times and locations of nutrient loading with explicit biological responses is challenging, as heterogeneities in nutrient loading and biological succession can obfuscate patterns.Using Lake Baikal (Siberia) and Flathead Lake (Montana, U.S.) as study systems, this dissertation investigates how human disturbance can alter nearshore communities in large oligotrophic ecosystems. Despite Baikal being remote and globally the largest lake by volume, low-level sewage pollution is suspected near certain small lakeside settlements. To investigate potential sewage pollution along a 40-km transect, we sampled water column sewage-associated micropollutants (i.e., microplastics and pharmaceuticals and personal care products0́3PPCPs), algal and macroinvertebrate abundance, as well as fatty acid profiles that provide insights on trophic interactions. Within the U.S. Pacific Northwest, Flathead Lake also is relatively well protected from human influence yet has demonstrated localized signs of sewage pollution. Building on our spatial study at Lake Baikal, we sampled 15 locations in Flathead Lake over four months for PPCPs as well as periphyton composition, stoichiometry, and fatty acids. Together, these studies evaluate how spatio-temporally heterogenous sewage loading can not only influence community composition, but also nutritional content available to the lake's larger food web. For Lake Baikal and Flathead Lake, these results are timely, as both lakes are experiencing increasing tourism and an aging wastewater management infrastructure. For lakes worldwide, this work details how ecosystems can respond to eutrophication, while also providing data and infrastructure for continued study intensively within systems and extensively across scales.
Download or read book Restoration and Management of Tropical Eutrophic Lakes written by M V Reddy and published by CRC Press. This book was released on 2005-01-09 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an essential knowledge base for both ecological restoration and management. Although tropical lakes are not identical, and therefore require individually developed and restoration and management practices; there are general principles in both restoration and management that can be derived from the case histories in this book and the limnological literature in general.
Download or read book Decaying Lakes written by Brian Henderson-Sellers and published by . This book was released on 1987-01-01 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of Seminar on Eutrophication and Biostimulation Clear Lake written by California. Department of Water Resources and published by . This book was released on 1972 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
