Aquatic Habitat Studies on the Lower Mississippi River, River Mile 480 to 530. report 4. Diel Periodicity of Benthic Macroinvertebrate Drift.
Abstract
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 < 0.05) at dawn than at other times. The lack of pronounced diel periodicity in total drift resulted from the offsetting of dominant day active versus night active species.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1980
- Accession Number
- ADA094425
Entities
People
- A. Dale Magoun
- C. Rex Bingham
- Stephen P. Cobb