Theses and Dissertations


Title: Benthic fauna of fertilized and unfertilized ponds in winter

Name: Liang, Jium-kuo

Degree: MS

Chair: Dr. John S. Dendy

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1964

Pages: 54

Keywords: Benthic Fauna,Fertilized Ponds,Unfertilized Ponds,Winter.

Abstract:

Populations of benthic fauna in ponds of the Auburn University Agricultural Experiment Station, Auburn, Alabama, were sampled from December, 1963 through February, 1964. The twelve 0.25-acre ponds used in this study had been fertilized with either (N-P-K) 8-8-2, 0-8-2, or 0-0-0. The ponds were stocked with fathead minnows, Pimephales promelas, bluegill, Lepomis macrochirus, and largemouth bass, Micropterus salmoides. Multiple-plate samplers were used for obtaining samples. Part of these samplers in each pond were suspended one foot from the surface of the water and one foot from the bottom, and others were placed in contact with the bottom at depths of 2 feet, 4 feet and 8 feet. Dry weights of organisms on the suspended samplers were obtained. Counts were made of individual animals on the samplers that were in contact with the bottom. The dominant groups of animals were Chaetogaster, Copepoda, other entomostracans including Cladocera and Ostracoda, and chironomid larvae, with their average numbers per square foot being 207, 166, 3899, and 159 respectively. The populations of organisms between the plates of the samplers were protected from predatory activities of the fish and were considered as representing the productivities of the ponds rather than standing crops which were left after predation by fish. Data were analyzed statistically by a computer. The rate of increase of biomass in the samples from ponds that had received 8-8-2 and those that had received 0-8-2 fertilization were significantly greater than those from the ponds that had received no fertilization, but the rates of increase of biomass from the 8-8-2 and the 0-8-2 ponds were not significantly different from each other. The variations in populations due to depth in these shallow ponds were not significant. A comparison of dry weights obtained in winter with previous records of dry weights from samples in summer indicated that the productive capacity in summer was significantly higher than that in winter.

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