Theses and Dissertations


Title: Comparisons of a gravimetric and an optical method for the estimation of plankton abundance

Name: Jones, Ralph Russell Jr.

Degree: MS

Chair: John M. Lawrence

Resides:

University: Auburn University

Location: Auburn, Alabama

Date: 1964

Pages: 68

Keywords: Gravimetric Method,Optical Method,Estimation,Plankton Abundance

Abstract:

Initial nephlos measurements were compared with dry weights of plankton to determine if a direct relationship existed between the two methods of estimating the standing crop of plankton. In addition, the efficiencies of Foerst and Servall centrifuges in the removal of plankton from water were compared. Samples of water collected from a series of plastic pools and earthen ponds were brought into the laboratory, centrifuged, and the collected plankton dried and weighed. Nephlometric measurements of plankton abundance of these same samples were made using a Colemen, Model 9, Nepho-Colorimeter. A definite linear relationship was found to exist between initial nephlos measurements and dry weight of plankton recovered by centrifugation. In a comparison of values for 48 plankton samples, the regression equation for the Foerst centrifuge was Y=0.37 + 0.14X.

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