Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 written by Thomas D. Wright and published by . This book was released on 1982 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 written by Michael P. Farrell and published by . This book was released on 1982 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: To expedite the research data management system (RDMS) required for complex and large-scale ecological field studies being done at the U.S. Army Engineer Waterways Experiment Station (WES), a graphical display system was developed. The Statistical Analysis System (SAS) provides the framework for making open-ended RDMS practical and cost-effective. PROC VIVIPLOT is the first of a series of SAS procedures that will produce copy-ready figures with some independence as to choice of plotter. Several approaches are available that minimize errors in coding variables. Numeric codes, 'smart codes, ' with embedded information allocated to positions within the value codes are widely used but unacceptable for variables with many values and/or many levels of classification. 'Nonsense' codes, or codes without embedded information, however, efficiently circumvent the problems associated with smart codes. Using nonsense codes, alphanumeric variable values are assigned a sequential numeric code as new values are encountered in the data base, irrespective of the position of the value in the classification scheme for that variable. With the use of nonsense codes, the management approach is open-ended and does not require a knowledge of the number of potential classification levels for the variables. In addition, experience with several large environmental data bases indicates that coding errors appear to be less frequent using nonsense codes than in those studies in which a smart code approach was used.
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 Report 1 Introduction written by and published by . This book was released on 1981 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: A pilot survey on the Lower Mississippi River, river mile 480 to 530, was conducted from April to October 1978. The objectives of this field survey were to collect data on fish, benthos, and water quality as they are impacted by the placement and design of navigational structures such as dikes and bank revetments. Information obtained on gear types and procedures from the pilot study was used to design further waterway studies on the Lower Mississippi River. Rationale for selection of sample sites, description of the study area and the 12 habitat types investigated, literature review, and general information on navigational structures are presented in this introductory report. A complete discussion of the fishery, benthos, water quality investigations, and other results of these studies as they relate to the Lower Mississippi River are found in Reports 2 through 8 of this series.
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 Report 8 Summary written by Thomas D. Wright and published by . This book was released on 1982 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: The pilot investigations provided significant guidance in the choice of methods and the experimental design for the long-term effort. In addition to increasing the overall validity of the data, cost savings were also obtained through the use of the most efficient techniques and in the reduction of unneccessary sampling. (Author).
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 written by Andrew C. Miller and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 written by Stephen P. Cobb and published by . This book was released on 1981 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 written by Stephen P. Cobb and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: TO PROVIDE DATA FOR DESIGN OF FIELD STUDIES TO DETERMINE THE IMPACTS AND ECOLOGICAL VALUE OF THE MAN-MADE HABITATS FORMED BY DIKE AND REVETMENT STRUCTURES IN THE LOWER Mississippi River, the aquatic habitat of a 50-mile reach of the river (mile 480 to 530 Above Head of Passes, AHP) was quantitatively mapped to determine spatial relationships among and within habitat types as a function of river stage and discharge. Twelve aquatic habitat types were defined within the study reach based on hydraulic, geomorphological, and ecological criteria: main channel, natural banks, revetted banks, sandbars, dike fields, permanent and temporary secondary channels, abandoned river channels(Types I and II), oxbow lakes, borrow pits, and inundated floodplain. By use of controlled aerial photography and hydrographic survey data, aquatic habitat surface acreages were computed for three river stages (low flow = +13.2 ft, medium flow = +24.6, and high flow = +38.4 ft on the Greenville, Mississippi, gage). Results of the habitat mapping revealed a significant change in total aquatic habitat acreage with changes in river stage and discharge. At the low flow stage 18,581 acres of habitat were present. Habitat area increased to 29,020 acres at medium flow and rose to 56,902 acres for high flow--a total increase of 222 percent in area over low flow conditions.
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 written by Andrew C. Miller and published by . This book was released on 1981 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 written by Thomas D. Wright and published by . This book was released on 1982 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 written by C. H. Pennington and published by . This book was released on 1980 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 written by and published by . This book was released on 1980 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on results of the pilot study, the following recommendations are made: when the choice of gear is limited because of manpower or equipment constraints, seines, electroshocking, gill nets, and hoop nets should be used in riverine systems; the number of habitats studied should be limited to dike fields, revetted banks, natural banks, and abandoned channels; the same habitat type should be sampled at two or more different locations to determine variance and comparability of physical and biological parameters; the number of samples taken with a particular gear in any given habitat should be increased to reduce the variation in C/f values; because of considerable temporal variation in species composition and abundance of fish communities in the different habitats, sampling should be conducted throughout the year; and before beginning a major field study, a pilot study should be conducted to familiarize field personnel with the physical characteristics of a study area, the fish species associated with the different habitats, and adequate sampling methods for the different fish communities.
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 written by David B. Mathis and published by . This book was released on 1981 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is Report 3 of the EWQOS series 'Aquatic Habitat Studies on the Lower Mississippi River, River Mile 480 to 530.' This is a pilot report on the benthic macroinvertebrate studies. For the purposes of this study, sampling was conducted along a 50-mile reach of the Lower Mississippi River. A habitat approach was taken wherein nine habitat types were selected for study. From these nine aquatic habitats, a total of 20,562 organisms, representing 72 distinct taxa, 17 orders, and 5 classes of benthic macroinvertebrates were collected. Dike structures were the most productive habitat (563.4 organisms/rock sample). Abandoned channels were the second most productive habitat (70.04 organisms/0.05 sq. m.). Natural banks were the next most productive habitat (9.4 organisms/0.05 sq. m.).
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 written by Harold L. Schramm and published by . This book was released on 1981 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 Report 3 Benthic Macro Invertebrate Studies Pilot Report written by and published by . This book was released on 1981 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is Report 3 of the EWQOS series 'Aquatic Habitat Studies on the Lower Mississippi River, River Mile 480 to 530.' This is a pilot report on the benthic macroinvertebrate studies. For the purposes of this study, sampling was conducted along a 50-mile reach of the Lower Mississippi River. A habitat approach was taken wherein nine habitat types were selected for study. From these nine aquatic habitats, a total of 20,562 organisms, representing 72 distinct taxa, 17 orders, and 5 classes of benthic macroinvertebrates were collected. Dike structures were the most productive habitat (563.4 organisms/rock sample). Abandoned channels were the second most productive habitat (70.04 organisms/0.05 sq. m.). Natural banks were the next most productive habitat (9.4 organisms/0.05 sq. m.).
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 written by and published by . This book was released on 1981 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Larval fish were collected in the Lower Mississippi River from 8 March to 13 November 1978 to describe variations in diversity and abundance of larval fish among nine types of habitats for the entire spawning season, investigate diel fluctuations in diversity and abundance, and evaluate replicate sampling procedures. The abandoned channel and oxbow lake habitats had similar larval populations; these habitats showed relatively low diversity and high densities of clupeids and centrarchids. Natural banks and revetted banks had high and similar diversities and abundance of larval fish. There were considerable variations in density and diversity among the four revetted bank stations sampled. The dike field habitat was characterized by a high diversity and moderate density of larval fish. All families of larval fish collected during the entire study were represented in the dike field habitat. The diversity and density of larval fish differed greatly among the six dike field stations sampled. Three of the four main channel stations sampled showed low diversity and density of larval fish. The fourth main channel station had high diversity of larval fish and high densities were observed on two sampling dated. Density of larval fish was low but diversity of larval fish was relatively high in the temporary secondary channel habitat. Density and diversity of larval fish were low in the permanent secondary channel and the sandbar habitats. A variance component analysis demonstrated that samples taken within a 1- to 2-hr time period of a diel cycle did not constitute significant (probability
Download or read book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530 written by C. Rex Bingham and published by . This book was released on 1980 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A diel periodicity study of drifting benthos in the lower Mississippi River at mile 529 resulted in the collection of 5090 macroinvertebrates consisting of 80 taxa. Samples collected with 505 micrometer mesh, 0.5-m (mouth diameter) plankton nets at midnight (0100 hr), dawn (0600 hr), noon (1200 hr), afternoon (1600 hr), and dusk (2100 hr) on 27-28 June 1978, had an average total drift density over all sampling times of 140 organisms/100 cubic meters of water filtered. Total drift density did not fluctuate markedly over the five sampling times, except that concentrations were significantly lower (P
Download or read book Macroinvertebrate Gear Evaluation written by Larry G. Sanders and published by . This book was released on 1986 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
