Download or read book Association of Macroinvertebrate Communities with Dike Habitats in the Lower Mississippi River written by John Michael Thron and published by . This book was released on 2008 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Benthic Macroinvertebrates of Selected Aquatic Habitats of the Lower Mississippi River written by David C. Beckett and published by . This book was released on 1983 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Environmental and Water Quality Operational Studies Macroinvertebrate Gear Evaluation written by Larry G. Sanders and published by . This book was released on 1986 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies were conducted to evaluate the effectiveness of nine methods for collecting macroinvertebrates associated with dikes, revetments, and sandbar habitats. Data were collected on the Lower Mississippi River between river miles 440 and 448. The nine methods evaluated included circular rock basket implants, rock samples, the push sled, the diaphragm pump, the electroshocker, articulated concrete matress (ACM) implants, ACM slabs, ACM blocks, and a modified Hess sampler. Some gear types were used to test diel variations in the macroinvertebrate communities while others were used to obtain information on community structure and seasonal variation at dike, revetment, and sandbar habitats.

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 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 Lower Mississippi River Environmental Program Report 7 An Ecological Evaluation of Five Secondary Channel Habitats in the Lower Mississippi River written by John A. Baker and published by . This book was released on 1987 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical, physical, and biological attributes of the aquatic habitat of five Lower Mississippi River secondary channels were surveyed during summer (July) 1984; two of the channels were resurveyed during fall (October). Dikes at least partially restricted flow through two of the channels (Lakeport Towhead and Cottonwood Bar, river miles 470 and 528, respectively); flow through the remaining three (Wolf Island, river mile 935; Island 8, river mile 915; Profit Island, river mile 250) was not restricted. The channel at which flow was most restricted, Lakeport Towhead, showed both physical and chemical differences from the others. Electroshocking catches of fish were highest at Profit Island due to unusually large collections of catfishes. The macroinvertebrate assemblages found within the channels were similar overall, and they appeared to reflect the current speed and substrate conditions. The dike macrofauna was similar to that noted in earlier studies on the Lower Mississippi River. Dikes that block or greatly restrict flow through secondary channels produce habitats in which the macroinvertebrate and fish assemblages are quite different from undiked channels, at least when river stages are near or lower than the controlling elevation of the dikes. (fr).

Download or read book Water Quality Macroinvertebrates Larval Fishes and Fishes of the Lower Mississippi River a Synthesis written by David C. Beckett and published by . This book was released on 1986 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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).

Download or read book Lower Mississippi River Environmental Program Report 5 Physical and Hydrologic Characteristics of Aquatic Habitat Associated with Dike Systems in the Lower Mississippi River River Mile 320 to 610 AHP written by Stephen P. Cobb and published by . This book was released on 1985 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of the investigation indicated that there is a significant amount of aquatic habitat found within dike systems (pool habitat) and associated sandbars. Total aquatic habitat surface area ranged from 10,971 acres at a 0-foot LWRP river stage to 25,778 acres at a stage of +15 feet LWRP for pool areas, and from 14,404 acres to 23,599 acres at these river stages in sandbars associated with dike systems. These data were based on hydrographic surveys taken in dike systems between 1978 and 1982. Four main types of dike structures were present in the river: transverse, L-head, vane, and stone-filled pile. A total of 156 individual dike structures had been constructed through 1982, with a total length of 60.1 miles. Transverse dikes constitute 77 percent of the dikes that have been built. Hydrologic analyses based on a 29-year period of record indicated that dike system pool habitat is relatively unstable during the river's low-flow period in the summer and fall (July through December); average number of days per event or occurrence of pool habitat in three 5-foot river stage intervals ranged from 7 to 11 days with 3.88 to 5.15 events per year. An estimated 54.5 to 100 percent of the total quantity of dike structure is inundated an average of 79 percent of the time during the river's high-flow period (January through June).

Download or read book ASSESSMENT OF IMPLANTED SUBSTRATE SAMPLERS FOR MACROINVERTEBRATES INHABITING STONE DIKES OF THE LOWER MISSISSIPPI RIVER written by David B. Mathis and published by . This book was released on 1982 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aquatic macroinvertebrate assemblage of a dike in the Lower Mississippi River was evaluated by implanting substrate basket samplers into the structure. The resulting data indicated that a diverse (38 taxa) and productive (average density = 101,968.4 organisms/sq. m assemblage was present, and was characterized by net-spinning caddisflies, tube-building chironomids, clinging mayflies, and isopods. A comparison of the surface stones of the basket samplers with adjacent surface stones of the dike indicated that the implanted substrates provided representative estimates of both the composition and structure of the macroinvertebrate assemblage. These data also indicated significant macroinvertebrate activity below the surface substrate of the dike. Differences in habitat conditions among dike positions (downstream, top, upstream) were the major contributors to overall sample variability. Thus, stratified random sampling based on dike position is recommended for future comparative studies. (Author).

Download or read book Macroinvertebrate Drift Associated with a Dike Field on the Lower Mississippi River written by Edward R. Bowles and published by . This book was released on 1985 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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).

Download or read book Ecological Databases of the Lower Mississippi River written by P. D. Close and published by . This book was released on 1992 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of Water Quality and Plankton in Selected Aquatic Habitats on the Lower Mississippi River written by Bruce M. Sabol and published by . This book was released on 1984 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main channel was characterized by high current velocities, high suspended solids, low light penetration, relatively high nutrient concentrations, generally low chlorophyll and zooplankton concentrations, stable and slightly alkaline pH levels, and stable oxygen saturation (approx. 90 percent). Detrital particulate organic matter (POM) comprised over 80 percent of the total POM for all sampling periods except August when algal POM comprised over half the total. The abandoned channel was characterized by quiescent, generally stratified eutrophic waters low in suspended solids and high in chlorophyll and zooplankton concentrations with moderately fluctuating pH levels and widely fluctuating oxygen saturation levels. Water quality and planktoon conditions observed in the secondary channel were indistinguishable from the main channel during periods of flow. During quiescent periods, suspended solids and turbidity decreased although other variables showed no appreciable difference from the main channel. Dike fields were transient lentic environments. During lotic periods, water quality was indistinguishable from the main channel. During isolations from the main channel, water clarity increased, soluble nutrients decreased, chlorophyll and zooplankton concentrations increased, and high pH and oxygen saturation levels were often observed. During the long period of isolation from the main channel, the dike fields became increasingly different from the main channel and from one another.

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 Environmental and Water Quality Operational Studies Water Quality Macroinvertebrates Larval Fishes and Fishes of the Lower Mississippi River A Synthesis written by David C. Beckett and published by . This book was released on 1986 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a synoptic report describing water quality and composition and distribution of benthic macroinvertebrates, larval fishes, and fishes within a 62-mile reach of the lower Mississippi River. Major water quality differences among habitates were related to the presence or absence of current. Continual flow and high turbulence in lotic habitats such as the main channel and permanent secondary channel resulted in high suspended solids concentrations, high turbidites, low water transparencies, and low light penetration. Such physical characteristics resulted in low algal biomass, more stable pH and dissolved oxygen levels, and the constant availability of algal nutrients. In contrast, lentic areas, such as the abandoned channel at most river stages, and the dike fields at low flows, had relatively lower suspended solids and increased water clarity. This resulted in high algal biomass, higher pH readings, frequent dissolved oxygen supersaturation in surface waters, and nutrient depletion in slack-water areas.

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: