Environmental and Water Quality Operational Studies. Biota of Selected Aquatic Habitats of the McClellan-Kerr Arkansas River Navigation System

This report describes fish and benthic macroinvertebrate composition in five aquatic habitat types within Pool 5, river miles 89-102, of the McClellan-Kerr Arkansas River Navigation System. Two dike fields, including the dike structures themselves, two secondary channels, two natural banks, two reve...

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Bibliographic Details
Main Authors: Sanders,Larry G, Baker,John A, Bond,Carolyn L, Pennington,C H
Format: Report
Language:English
Subjects:
AQUATIC ANIMALS
Aquatic ecology
ARKANSAS
Arkansas River
BENTHONIC ZONES
Biology
ECOLOGY
HABITATS
Hydrology, Limnology and Potamology
INLAND WATERWAYS
INVERTEBRATES
LPN-EWQOS-VA
McClelland-Kerr Arkansas River Project
RESERVOIRS
RIVERS
SAMPLING
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Summary:This report describes fish and benthic macroinvertebrate composition in five aquatic habitat types within Pool 5, river miles 89-102, of the McClellan-Kerr Arkansas River Navigation System. Two dike fields, including the dike structures themselves, two secondary channels, two natural banks, two revetted banks, and one abandoned channel were sampled during high- (June, 125,000 cfs) and low - (September, 10,000 cfs) flow periods during 1982. Within each sampling period, relatively small differences were observed among habitats in terms of dissolved oxygen, temperature, pH, and conductivity. Fish populations differed most among habitats during the June high-flow period, when the habitats were physically most distinct. Fish species composition was primarily a function of current velocity. The macroinvertebrate fauna colonizing the dike and revetment structures reflected the differences in physical conditions which existed in the study during June. The benthic communities that colonized the bottom substrates differed most among habitats during the June sampling effort due to the extreme differences in current velocities and substrate types present at the various habitats. Increases in density and diversity were noted for all habitats sampled in September as compared to June, with the natural bank habitat exhibiting the highest density estimates of all habitats sampled.