Download or read book The Effects of Altered Nutrient Loads on the Upper Mississippi River Chain of Lakes in the Vicinity of Bemidji Minnesota written by Patrick T. Trihey and published by . This book was released on 1982 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Checklist of State Publications written by Library of Congress. Exchange and Gift Division and published by . This book was released on 1983 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt: June and Dec. issues contain listings of periodicals.

Download or read book Nutrient Control Actions for Improving Water Quality in the Mississippi River Basin and Northern Gulf of Mexico written by National Research Council and published by National Academies Press. This book was released on 2009-08-13 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: A large area of coastal waters in the northern Gulf of Mexico experiences seasonal conditions of low levels of dissolved oxygen, a condition known as hypoxia. Excess discharge of nutrients into the Gulf of Mexico from the Mississippi and Atchafalaya rivers causes nutrient overenrichment in the gulf's coastal waters and stimulates the growth of large algae blooms. When these algae die, the process of decomposition depletes dissolved oxygen from the water column and creates hypoxic conditions. In considering how to implement provisions of the Clean Water Act to strengthen nutrient reduction objectives across the Mississippi River basin, the U.S. Environmental Protection Agency (EPA) requested advice from the National Research Council. This book represents the results of the committee's investigations and deliberations, and recommends that the EPA and U.S. Department of Agriculture should jointly establish a Nutrient Control Implementation Initiative to learn more about the effectiveness of actions meant to improve water quality throughout the Mississippi River basin and into the northern Gulf of Mexico. Other recommendations include how to move forward on the larger process of allocating nutrient loading caps-which entails delegating responsibilities for reducing nutrient pollutants such as nitrogen and phosphorus-across the basin.

Download or read book Trends in Nutrient Concentration and Load for Streams in the Mississippi River Basin 1974 94 written by Dee L. Lurry and published by . This book was released on 1997 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mississippi River West Bank New Orleans Vicinity written by and published by . This book was released on 1987 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spatial Distribution of Nutrients in the Mississippi River System 1991 1992 written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Concentrations of dissolved nutrients (nitrate, nitrite, ammonium and orthophosphate) were measured on surface-water grab samples collected at ten mile intervals along the entire length of the navigable portion of the Mississippi River during three cruises in June?July 1991, September?October 1991 and March? April 1992. Samples were also collected at the mouths of some of the major tributaries and, at selected points, three-sample cross sections were collected across the river to measure cross-channel variability. Simultaneously with collecting each sample, the discharge of the Mississippi River was estimated, permitting the calculation of the nutrient load in the Mississippi River at each sample point. The large number of samples collected (between 179 and 207 per cruise) give a picture of the instantaneous longitudinal variation of nutrients in the Mississippi River during three different seasons. Both nitrate and orthophosphate loads appear to increase or remain constant downriver for each cruise, indicating that mechanisms for the removal of these compounds are not as rapid as their introduction into the river. In addition, below the confluence of most of the major tributaries, the loads show a?step? increase caused by the nitrate and orthophosphate contributions from the tributaries. From this data, one can identify the possible sources of nitrate and orthophosphate arriving at the Gulf of Mexico from the Mississippi River. During each of the three cruises (at three different seasons), the majority of the nitrate and ortho-phosphate appears to have originated from the Upper Mississippi River Basin, above the con-fluence of the Missouri River. Ammonium and nitrite loads appear to originate as point-sources, but disappear within approximately one hundred miles of their introduction, probably as a result of conversion to nitrate and/or nitrogen gas. Any nitrite or ammonium from the Mississippi River deposited into the Gulf of Mexico therefore probably originated within one hundred miles of the Gulf.

Download or read book Spatiotemporal Drivers of Tributary Nutrient Dynamics written by Robert James Mooney and published by . This book was released on 2020 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Index to the Annual Proceedings of the Upper Mississippi River Conservation Committee written by Upper Mississippi River Conservation Committee and published by . This book was released on 1989 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ambient Water Quality Criteria Recommendations written by and published by . This book was released on 2001 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contaminants in the Upper Mississippi River written by Mississippi River Research Consortium. Meeting and published by Butterworth-Heinemann. This book was released on 1984 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Annual Meeting of the Upper Mississippi River Conservation Committee written by Upper Mississippi River Conservation Committee. Meeting and published by . This book was released on 1984 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt: These annual proceedings discuss Mississippi River conservation and management issues, ongoing research, and UMRCC projects.

Download or read book Proceedings of the Annual Meeting Upper Mississippi River Conservation Committee written by Upper Mississippi River Conservation Committee. Meeting and published by . This book was released on 1997 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Addressing Nutrient related Water Quality Impacts on the Upper Mississippi River written by Upper Mississippi River Basin Association and published by . This book was released on 2011 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Growth Tissue Composition and Stoichiometry of Duckweed Grown in Low Nutrient Backwaters of the Upper Mississippi River written by John F. Sullivan and published by . This book was released on 2012 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cultural eutrophication of aquatic systems has received considerable attention in our nations waters though much of it in the past has focused on nutrient enrichment problems in lakes. More recent attention has been made on evaluating the impacts of nutrients in riverine systems (Hilton 2006, UMRBA 2011). Recent evidence suggests that nutrient-related impacts in rivers may come in forms other than nuisance blue-green algae blooms that are typical in eutrophic lakes. The development of thick benthic or surface mats of filamentous algae or duckweed in quiescent in riverine aquatic habitats as a result of nutrient enrichment are examples of problems that may develop in these systems. These mats can result in negative impacts to aquatic life and obstruct recreational uses. Such conditions occur commonly during mid-summer periods in shallow vegetated areas of the Upper Mississippi River (UMR), especially in off-channel sloughs, backwaters and marshes. The objective of this work was to further define and verify nutrient conditions that limit the growth of FFP in UMR backwaters and to identify tissue nutrient thresholds and stoichiometry that are suggestive of nutrient-limited growth. We focused our study in areas where summer water column nutrient concentrations were normally low and seeded the sites with healthy duckweed placed in enclosures. This allowed us to measure duckweed growth rates, tissue nutrient composition and stoichiometry in areas where nutrient limitation was more likely and duckweed was uncommon or absent. We believed this approach would allow us to more accurately characterize nutrient conditions and tissue composition that are suggestive of nutrient limitation and help verify our evaluations made in comparative studies of FFP growth in different UMR backwaters.

Download or read book A Diatom Population and Nutrient Survey in the Mississippi River at Lock 7 and Lock 8 written by Clement C. Ozburn and published by . This book was released on 1969 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study is twofold: (1) to obtain information which may be used to determine to what extent diatoms can be used as water quality indicators; (2) to supplement baseline data on annual plankton standing crops of the upper Mississippi River. This survey began 3 October, 1967 and continued through 30 September, 1968. Three samples were taken every two weeks: one in Pool 7 above Lock and Dam No. 7, one in the channel at Lock and Dam No. 7, and one in the channel at Lock and Dam No. 8. A water nutrient analysis was done in addition to the diatom survey. Sixty seven species of diatoms are identified in this survey. The data includes only the ten species which made up 5% or more of each sample. Species domination, timing of annual maximum standing crops, and per cent occurrence-per cent volume relationships are compared to the Department of Health, Education and Welfare's Water Pollution Surveillance System reports (1957-1967). Correlations of standing crop and physiochemical factors are discussed.

Download or read book Diffusive and Kinetic Fluxes of Phosphorus from Sediments in Relation to Phosphorus Dynamics in Lake Pepin Upper Mississippi River written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over a 3-year period (1994-96), suspended seston and phosphorus (P) dynamics were examined in the Upper Mississippi River (UMR) and naturally impounded Lake Pepin, with special attention to external and internal P loading processes that may be contributing to deteriorating water quality conditions. The Minnesota River accounted for most of the annual and summer suspended seston (81 %) and total phosphorus (44 %) load, while the Metropolitan Wastewater Treatment Plant (Metro Plant) accounted for 18 % of annual soluble reactive phosphorus (SRP) loading to the UMR. External loading during the summer of suspended seston, total P, and SRP to Lake Pepin averaged 30,000/m2/day, and 60 mg/m2/day, respectively. The lake retained a substantial portion of the summer suspended seston load and was also a sink for total P. While total P concentrations generally declined in Lake Pepin from headwaters to outflow, SRP exhibited a trend of increasing concentration from headwaters to outflow with net SRP export during the summer. These contrasting patterns in total P and SRP indicated the occurrence of internal P loading and/or transformations in the water column of P from particulate to soluble phases. Internal diffusive P flux from profundal sediments, estimated from laboratory incubation systems under different temperature and redox conditions, averaged 7.5 mg/m2/day during the summer under predominately oxic conditions over all years. Although this oxic rate was high relative to other eutrophic lakes, it accounted for

Download or read book Aquatic Synthesis for Voyageurs National Park written by and published by . This book was released on 2003 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Voyageurs National Park (VOYA) in northern Minnesota contains significant aquatic resources including 30 lakes and numerous wetlands. This synthesis contains an integrated account of what is known about the aquatic resources of VOYA; compares VOYA resources to those of other areas; and identifies opportunities and needs for future studies and surveys. Surveys and studies in VOYA have identified fifty-four fish species from 16 families 820 vascular plant species and 7 amphibian and 3 reptile species (higher numbers probably occur). Estimates of relative abundance for phyto- and zooplankton vary among VOYA lakes and depths surveyed. The VOYA fish populations and communities have been the most intensively studied. Twenty-eight percent of VOYA wetlands are the result of beaver activity. Mercury contamination and its food-chain bioaccumulation in VOYA are of particular concern. An integrated monitoring plan is needed in VOYA to provide continuous data and information on the complex physical chemical, and biological factors that influence aquatic systems. Resource managers in VOYA will use this information to understand and explain observed changes and to predict the potential for future changes.