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Book Lower Mississippi River Environmental Program Report 9 An Ecological Investigation of Revetted and Natural Bank Habitats in the Lower Mississippi River

Download or read book Lower Mississippi River Environmental Program Report 9 An Ecological Investigation of Revetted and Natural Bank Habitats in the Lower Mississippi River written by John A. Baker and published by . This book was released on 1988 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical, physical, and biological attributes of the aquatic habitats associated with four revetments and two natural banks in the Lower Mississippi River were surveyed during summer and fall 1985. The revetments were located at approximately river miles 446, 370, 309, and 41; the two natural banks were located at river miles 368 and and 41. With the exception of water temperature in the fall, temperature, dissolved oxygen, pH, conductivity, turbidity, oxidation-reduction potential, total organic carbon, and dissolved and suspended solids showed relatively little variation over the entire study reach. Natural bank substrates were characterized by consolidated clays, with sand and silt, or sand and gravel, occurring frequently. Revetted banks were characterized by articulated concrete mattress (ACM), about one-half of which appeared to be overlayed with sand and silt. Macroinvertebrate community composition depended primarily upon the substrate type and current speed encountered at both revetted and natural banks. ACM surface modification experiments showed that mean densities, biomasses, and number of taxa of macroinvertebrates were greater on grooved blocks than on other modification type, or on control blocks. Both traditional fish collecting gears and hydroacoustics indicated differences in fish density between the two natural banks, among the three revetted banks, between the natural and revetted banks at sites at which both occurred, and between seasons. (fr).

Book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530

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.

Book An Ecological Investigation of the Baleshed Landing Ben Lomond and Ajax Bar Dike Systems in the Lower Mississippi River Mile 481 to 494 AHP

Download or read book An Ecological Investigation of the Baleshed Landing Ben Lomond and Ajax Bar Dike Systems in the Lower Mississippi River Mile 481 to 494 AHP written by and published by . This book was released on 1988 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Fishes of Selected Aquatic Habitats on the Lower Mississippi River

Download or read book Fishes of Selected Aquatic Habitats on the Lower Mississippi River written by C. H. Pennington and published by . This book was released on 1983 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to investigate the ecological role of dikes and revetments in a riverine ecosystem. Collections were made from the Lower Mississippi River near Greenville, Miss., to compare the relative value of four habitat types for fish. Sampling was conducted from April 1979 to September 1980 to describe species diversity, abundance, and distribution of fish from dike fields, revetted banks, natural banks, and an abandoned river channel. Fish populations differed considerably among the four habitat types investigated. The greatest number of species was captured in the dike field habitat (53), followed in order by the abandoned channel (31), revetted banks (27), and natural banks (24).

Book Fisheries Review

Download or read book Fisheries Review written by and published by . This book was released on 1988 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Sport Fishery Abstracts

Download or read book Sport Fishery Abstracts written by and published by . This book was released on 1988 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Lower Mississippi River Environmental Program Report 12 An Ecological Investigation of the Baleshed Landing Ben Lomond and Ajax Bar Dike Systems in the Lower Mississippi River River Miles 481 to 494 AHP

Download or read book Lower Mississippi River Environmental Program Report 12 An Ecological Investigation of the Baleshed Landing Ben Lomond and Ajax Bar Dike Systems in the Lower Mississippi River River Miles 481 to 494 AHP written by John A. Baker and published by . This book was released on 1988 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The chemical, physical, and biological attributes of aquatic habitats associated with two Lower Mississippi River dike system pools were investigated from August 1985 to January 1986. The habitats included the dike pool at river miles (RM) 488.6 to 491.4, and the pool at RM 483.6 to 484.4. A discontinuous stretch of sandbar habitat bordering the two pools was also sampled for comparison, though at a lower level of effort. The larger pool received substantial inflow around the channelward end of the dike, and over low points in the dike, during the entire study. Sand and gravel sediments were common in the larger pool in all months. Water temperature, dissolved oxygen levels, pH, and conductivity were similar in all three habitats during all sampling periods. Chlorophyll A concentrations were relatively high only in September. The benthic macroinvertebrate assemblages found in sediment samples from the two pools were generally similar during both August and October. No substantial differences were noted between the fish assemblages of the two pools; the fish assemblage found in the river sandbar habitat was somewhat different. Hydroacoustics indicated that fish were widely distributed in all microhabitats in both pools. (fr).

Book Selected Water Resources Abstracts

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1987 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530

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.

Book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530

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

Book Lower Mississippi River Environmental Program Report 15 Vegetation Development on Revetments Along the Lower Mississippi River

Download or read book Lower Mississippi River Environmental Program Report 15 Vegetation Development on Revetments Along the Lower Mississippi River written by James W. Webb and published by . This book was released on 1988 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nearly 900 miles of bank protection works (revetments) are in place along the Lower Mississippi River. These structures are composed of a variety of materials and support various degrees of vegetation cover. Plant establishment on revetted banks has implications for both bank stability and wildlife habitat quality; therefore, a study was initiated to investigate the relationship between vegetation development and revetment features and materials. Field sampling at 25 sites indicated that vegetation development was more pronounced on upper than lower banks and on sites protected from direct impacts of high-velocity flows. Loose rock paving (riprap), which is typically employed on upper banks, generally supported the most vegetation. Plants were frequently found growing between the blocks of articulated concrete mat revetments. Asphalt paving had high herbaceous cover, but tree establishment was limited. In general, only two species of trees (Salix nigra and Salix interior) commonly occurred on the lower half of revetted banks. Upper banks and the top bank zone supported a more diverse tree species assemblage. Vines were a major component of revetment plant communities on the upper bank. Ground cover vegetation was more abundant in higher bank zones, but many annual species were able to colonize the lower bank where sediment was deposited as the river receded. (fr).

Book Aquatic Habitat Studies on the Lower Mississippi River River Mile 480 to 530

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.