Limnology. Limnology - 3rd Edition - ISBN: , Authors: Robert Wetzel. eBook ISBN: DRM-free (EPub, PDF, Mobi). Editorial Reviews. Review. "This newest edition is marked not only by substantial reworking, Limnology: Lake and River Ecosystems 3rd Edition, Kindle Edition. by. Limnology deal with the study of fresh waters contained within continental boundaries. Limnology evolved into limnology (from the Greek λίμνη (limne) = lake and λόγος (logos) = study. It is considered as a .. Wetzel, R.G. (). Limnology.
|Language:||English, Spanish, Indonesian|
|Country:||Papua New Guinea|
|Genre:||Fiction & Literature|
|Distribution:||Free* [*Sign up for free]|
Wetzel, Robert A. Limnological analyses/Robert G. Wetzel, Gene E. Likens. . book in an intensive course in limnology during a single semester. Hopefully our. ISBN ; Digitally watermarked, DRM-free; Included format: PDF; ebooks can be used on all reading devices; Immediate eBook download after. Limnology: lake and river ecosystems Robert G. Wetzel Publisher: Academic Press Release Date: ISBN: Author: Robert G. Wetzel Download.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Upcoming SlideShare. Like this document? Why not share! Lives of conifers a comparative acc Embed Size px.
Start on. Show related SlideShares at end. WordPress Shortcode. YoungCarlton01 Follow. Published in: Full Name Comment goes here. Free Preview.
download eBook. download Hardcover. download Softcover. FAQ Policy. About this Textbook In this thoroughly updated third edition, the authors have provided a series of carefully designed and tested field and laboratory exercises that represent the full scope of limnology. Show all. From the reviews of the third edition: Pages Light and Temperature Wetzel, Robert G.
Physical Characteristics: In preparing its recommendations, the committee surveyed major universities with aquatic science programs and sought input from professional societies that include limnologists among their membership. The committee also held a workshop with aquatic resource managers to help develop practical recommendations for improving education in limnology.
Traditionally, many have perceived limnologists as scientists who study primarily the biological properties of lakes. In this report, the Committee on Inland Aquatic Ecosystems has defined limnology broadly to include the biology, physics, and chemistry of all inland waters, including rivers and wetlands as well as lakes.
Some scientists who study streams and wetlands, including several committee members, identify themselves as limnologists as well as stream or wetland scientists, while others do not.
Regardless of where one draws the line in defining limnologist, lakes, rivers, and wetlands are interconnected, and the sciences that study them are closely allied. This report is designed to broaden the understanding of limnology and to provide a foundation for developing educational programs in limnology that will better prepare the next generation to address the world's many water quality challenges.
Administrators of university and government science programs, students of aquatic science, and aquatic resource managers in government agencies and the private sector can use the report to learn more about the history and current status of human efforts to understand lakes, rivers, and freshwater wetlands.
For administrators and teachers of aquatic science, the report recommends ways to strengthen university limnology programs to produce a generation of well-educated citizens, aquatic resource managers, and researchers capable of understanding and alleviating the many sources of water quality degradation. This chapter highlights the status of inland waters and the role of limnologists in improving these waters.
Chapter 3 describes key contemporary water problems that have been studied by limnologists and whose solution will require further limnological research. Chapter 4 analyzes the current system for teaching limnology in institutes of higher education and recommends ways to restructure the system to strengthen limnological training.
Chapter 5 recommends strategies for linking education and research in limnology with aquatic resource management. Also included in this volume are eight background papers prepared by committee members to stimulate the discussions that led to the writing of this report. The papers do not represent the consensus views of the committee as a whole but instead reflect the range of perspectives from which problems in aquatic science education and research can be viewed. Nevertheless, many North American fresh waters remain degraded or at high risk.
Similarly, 31 percent of lakes are too contaminated for drinking even with conventional treatment, 40 percent are unable to fully support aquatic life, and 36 percent are unsuitable for swimming, based on surveys of 46 percent of total U. Based on these data, it is clear that the United States is still a long way from achieving the goals of the Clean Water Act.
Continued degradation of surface waters causes substantial economic losses, some of the most significant of which are associated with lost fishing revenues, increased costs for treating drinking water, and lost recreational opportunities. The fishing restrictions and fish consumption advisories common in polluted water bodies jeopardize the multibillion-dollar fishing industry.
This type of treatment is designed primarily to remove turbidity and microbiological contaminants. Pollution episodes in the Potomac date back as early as the s, when sewers first conveyed human wastes to the river from Washington, D. Pollution in the river continued to worsen until, in , the federal government appropriated funds to build the Blue Plains sewage treatment plant to remove settleable solids before the sewage entered the river.
The plant's capacity was soon exceeded, however.
As a result, discharges of raw sewage became increasingly common, and the river continued to deteriorate. In , participants at a Washington, D. By , the pollutant loading to the river was higher than it had been in Uman, Algal mats choked a mile stretch of the river downstream from Washington in late summer.
Fishing and swimming were prohibited. Recreational boating is now possible on the river. Bottom vegetation and bass have returned after a long absence Uman, Despite these notable improvements, swimming in and consuming fish from portions of the river remain health risks Interstate Commission on the Potomac River Basin, Contaminants such as chlordane, polychlorinated biphenyls, and heavy metals remain.
In addition, the river is subject to bacterial contamination from discharges of raw sewage when major storms overload Blue Plains and other local sewage treatment plants. Thus, although the quality of the Potomac has improved substantially, it still does not meet the "fishable and swimmable" goal of the Clean Water Act. According to the EPA , 1, fish consumption advisories—warning consumers and fishermen to limit intake of certain fish because of contamination—were in effect in 47 states in ; contaminant levels in fish tissues can be more than a million times those in surrounding water because of the tendency of contaminants to concentrate in species at higher levels of the aquatic food web.
The need to provide more advanced levels of treatment for degraded sources of drinking water also has significant costs. Losses of recreational opportunities when water is contaminated have extremely high costs. A survey by the President's Commission on Americans Outdoors found that 59 percent of Americans over age 12 fish and 27 percent boat each year Kealy et al.
In , Resources for the Future, an economic study institute in Washington, D. Worldwide, contamination of waterways places artificial limits on the supply of potable water. The time required to replenish the water supply of a contaminated lake can be a decade or more Wetzel, , and the time to cleanse contaminated sediments can be much longer.
Consequently, the effects of water quality degradation can be long-lasting and in some cases permanent. Where water resources are scarce, such as in parts of the western United States and other arid areas of the world, contamination of water bodies can threaten the livelihood of surrounding populations. In particular, the Clean Water Act addressed primarily one form of pollution: it required treatment of "point-source" discharges from municipal sewage treatment plants and industries.
Contemporary water problems arise from a multitude of other causes in addition to point sources. Key causes of problems in freshwater ecosystems, described in more detail in Chapter 3 , include the following: Runoff of pollutants from agricultural and urban lands: The EPA estimates that agricultural runoff impairs 56 percent of the nation's lakes and reservoirs and 72 percent of the nation's rivers and streams.
Urban runoff from storm sewers is a cause of impairment of 24 percent of lakes and reservoirs and 11 percent of rivers and streams, according to the EPA.
In the first part of the twentieth century, the Great Lakes in general and Lake Erie in particular supported one of the world's most valuable commercial fisheries. Lake Erie was more productive than the other lakes, in part because its relative shallowness provided an ideal environment for many species of commercially valuable fish Egerton, Beginning in the s, the composition of Lake Erie's aquatic community began to shift from commercially valuable fish such as lake trout and sturgeon toward fish such as catfish and carp that have lower market values.
Lake trout, once abundant, had disappeared by and sturgeon by Egerton, Fisheries biologists attributed loss of these and other valuable species to pollution, loss of habitat, and overfishing Egerton, Several major urban and industrial centers—Buffalo, Cleveland, Toledo, and Detroit—lie along Lake Erie or its major tributaries.
Prior to the passage of the Clean Water Act and the signing of the Great Lakes Water Quality Agreement, discharges of untreated or inadequately treated sewage and industrial wastes from these industrial centers into the lake were widespread. One of the key results of waste discharges to the lake, limnologists discovered, was an overabundance of phosphorus.
The excess phosphorus caused excessive growth of algae, which in turn led to the proliferation of bacteria that decompose algae, a decline in the oxygen content of lake bottom waters as the algae decomposed, and loss of the valuable commercial fish that require high oxygen concentrations. For example, the concentration of algae near Cleveland increased fold between and Eos,