Theses and Dissertations


Title: Evaluation of masonite plates for sampling macroinvertebrates in streams

Name: Riemer, Donald Neil

Degree: MS

Chair: Dr. Homer S. Swingle

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1960

Pages: 69

Keywords: Masonite Plates,Sampling,Macroinvertebrates,Streams.

Abstract:

This study was designed to gather certain information about the use of masonite plates as artificial substrata for sampling aquatic macroinvertebrate populations. Each sampling device consisted of eight 3-inch-square plates, which were bolted together by means of a hole drilled through the center of each. A one-eighth inch space was left between the plates for the organisms. The specific objectives of the study were to determine the effects of distance from bottom, duration of exposure, and position in relation to current, on the samples taken. Samples were taken 1 foot from the bottom and 6 feet from the bottom in the Tombigbee River, (Sumter and Marengo Counties, Alabama) in order to determine the effects of locating the devices different heights above the river bottom. Data showed that distance from bottom had little effect on numbers and species collected in areas where precipitation of silt was minimal. In areas where silt was being deposited in large amounts, however, the deeper devices collected far fewer organisms than the shallow devices. Samples were also taken from Chewacla Creek, Lee County, Alabama. Half of the sampling devices were emplaced with plates perpendicular to the current, and the other half with plates parallel to the current. The parallel plates collected significantly more organisms than the perpendicular plates. No difference was noted in the variety of organisms collected by the two methods. Samples taken after an exposure of one week in Chewacla Creek did not differ greatly in numbers or species from those taken after an exposure of two weeks, but there was a marked increase in numbers after 3 weeks' exposure. Samples taken during a period when fish were dying contained practically no organisms at all. The fertile Tombigbee River yielded many more invertebrates per sample than did the relatively infertile Chewacla Creek.

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