Title page for ETD etd-11142012-040232

Type of Document Master's Thesis
Author Toczydlowski, David
URN etd-11142012-040232
Title Aquatic microbial community responses to stress :comparison of nontaxonomic and taxonomic indices
Degree Master of Science
Department Zoology
Advisory Committee
Advisor Name Title
Buikema, Arthur L. Jr. Committee Chair
Cairns, John Jr. Committee Member
Horner, Sally G. Committee Member
  • Aquatic organisms
Date of Defense 1985-05-05
Availability restricted
Three nontaxonomic indices; ATP/Chlorophyll a(ATP/Chla), ATP/ADP, and Chlorophyll a/Pheopigment (Chla/Pheo) were compared to the taxonomic measures of species diversity (d) and species richness as indicators of stress in aquatic environments. Field and laboratory microcosm responses of indigenous microbial communities exposed to municipal sewage treatment plant (STP) effluent were monitored. The STP effluent produced increased adenylate concentrations, ATP/ADP and ATP/Chla ratios, and decreased Chla, Chla/Pheo, d, and species richness relative to upstream reference communities. Nontaxonomic responses were consistent in four separate field tests.

Significant differences in responses were discernible in 3 d when communities were transferred from reference to polluted sites. Chla/Pheo decreased more rapidly than other measurements. The predictive capability of laboratory flow—through microcosm tests was examined by simultaneously transferring communities from upstream reference sites to downstream field sites and to various dilutions of field effluent in the laboratory.

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