Lower Mississippi River Environmental Program. Report 9. An Ecological Investigation of Revetted and Natural Bank Habitats in the Lower Mississippi River PDF Download
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Author: John A. Baker Publisher: ISBN: Category : Languages : en Pages : 123
Book Description
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).
Author: John A. Baker Publisher: ISBN: Category : Languages : en Pages : 123
Book Description
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).
Author: Stephen P. Cobb Publisher: ISBN: Category : Maps Languages : en Pages : 0
Book Description
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.
Author: C. H. Pennington Publisher: ISBN: Category : Aquatic biology Languages : en Pages : 0
Book Description
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).
Author: John A. Baker Publisher: ISBN: Category : Languages : en Pages : 104
Book Description
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).
Author: John A. Baker
Author: John A. Baker
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Author: Stephen P. Cobb
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Author: C. H. Pennington
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Author: John A. Baker