Theses and Dissertations

Title: Bottom fauna development in Beaver Reservoir, northwest Arkansas, during the period of filling, 1964-1966

Name: Aggus, Larry Richard

Degree: PhD

Chair: Dr. John S. Dendy

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1969

Pages: 118

Keywords: bottom fauna development,Beaver Reservoir,Arkansas.


Benthos development in the mid-lake region of Beaver Reservoir in northwest Arkansas, was investigated during the periods of June through September from 1964 through 1966. This period approximately corresponded to the time of filling. Littoral benthos development was emphasized. In 1964, the mid-lake region of Beaver Reservoir was essentially a dense stand of partially submerged timber. Large quantities of floatage and duckweed became trapped in this timber and effectively reduced wind generated currents. Bryozoans and fresh water sponges were abundant. A major water level rise in 1965 permitted extensive wave action. These organisms virtually disappeared from exposed areas in the reservoir. Chironomids were numerical benthic dominants throughout the study. Two species of Glyptotendipes were extremely abundant during the summer of 1965. During 1966, specimens of Polypedilum digitifer and several species of Tanytarsinae increased in abundance. Changes in the abundance of these benthic forms coincided with an accelerated rate of shoreline erosion and siltation. Diversity of male chironomids computed from emergence trap collections, indicated only slight differences in community structure between sampling stations during 1965 and 1966. Multiple-plate samplers provided estimates of benthic production. Greater quantities of benthic invertebrates accumulated on samplers placed in areas of flooded herbaceous vegetation. A decline in production was indicated as this vegetation decomposed and fragmented. Benthos development at each study site appeared somewhat independent of other sites.Small invertebrates attached on exposed surfaces of plate samplers while larger forms attached on protected surfaces. Considerable predation by fish appeared probable.

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