Aquatic Habitat Studies on the Lower Mississippi River, River Mile 480 to 530. Report 2. Aquatic Habitat Mapping

Cobb, Stephen P.; Clark, Jonathan R.

doi:10.21236/ada097659

Cited by 5 publications

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“…At moderate and low flows, however, the entire area is a backwater. Additional details and descriptions of Lower Mississippi River aquatic habitats are presented in Cobb and Clark (1981).…”

Section: Habitat Types Descriptionmentioning

confidence: 99%

Benthic Macroinvertebrates of Selected Habitats of the Lower Mississippi River

Beckett

Bingham

Sanders

1983

Journal of Freshwater Ecology

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We investigated the distribution of benthic macroinvertebrates in four aquatic habitat types in the lower Mississippi River: dike fields, a natural bank, a secondary channel, and an abandoned channel over a high flow (flood stage), two moderate, and two low flow periods. The biotas present in the natural bank, the secondary channel, and the abandoned channel showed only minor changes in composition over the various flow regimes. The natural bank was consistently dominated by the burrowing mayflies Tortopus incertus and Pentagenia vittige2.a and hydropsychid caddisflies; the consistently most common taxa in the secondary channel were the sand-dwelling chironomids Robackia cZaviger and Chemovskiia orbicus; phantom midges, tubificid oligochaetes, and fingernail clams were always the most abundant macroinvertebrates in the abandoned channel. The dike fields, however, showed large changes in biotic composition over the different flow regimes. These compositional changes correlated with changes in river stage and resultant alterations in current and substrate. This study indicates that the distribution of macroinvertebrates in the lower Mississippi River is a function of the physical characteristics of the system, notably current velocity and substrate composition.

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“…At moderate and low flows, however, the entire area is a backwater. Additional details and descriptions of Lower Mississippi River aquatic habitats are presented in Cobb and Clark (1981).…”

Section: Habitat Types Descriptionmentioning

confidence: 99%

Benthic Macroinvertebrates of Selected Habitats of the Lower Mississippi River

Beckett

Bingham

Sanders

1983

Journal of Freshwater Ecology

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Relative Selectivity of Hoopnetting and Electric Fishing in the Lower Mississippi River

Schramm

Pugh²

2000

Management and Ecology of River Fisheries

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Fate of lower Mississippi river habitats associated with river training dikes

Shields

1995

Aquatic Conservation

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1.Regions of reduced velocity adjacent to spur dikes along the Lower Mississippi River are valuable aquatic habitats. Similar zones along other large rivers have been converted to terrestrial habitats by sediment deposition.2. Repetitive hydrographic surveys of 26 representative groups of dikes are examined to determine the direction and rates of change.3. Since the dikes were constructed, the aquatic volume and area of associated low-velocity habitats have been reduced by 38% and 17%, respectively. Examination of time series shows that most changes occur shortly after construction, and after initial adjustment, habitat area and volume fluctuate about a condition of dynamic equilibrium.4. Sedimentation rates were most rapid for dike fields constructed on the inside of bends to prevent chute development. Dike fields built to force or maintain thalweg crossings exhibited erosion rather than deposition.

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Aquatic Habitat Studies on the Lower Mississippi River, River Mile 480 to 530. Report 2. Aquatic Habitat Mapping

Cited by 5 publications

References 0 publications

Benthic Macroinvertebrates of Selected Habitats of the Lower Mississippi River

Benthic Macroinvertebrates of Selected Habitats of the Lower Mississippi River

Relative Selectivity of Hoopnetting and Electric Fishing in the Lower Mississippi River

Fate of lower Mississippi river habitats associated with river training dikes

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