Title page for ETD etd-11142012-040232
|Type of Document
||Aquatic microbial community responses to stress :comparison of nontaxonomic and taxonomic indices
||Master of Science
|Buikema, Arthur L. Jr.
|Cairns, John Jr.
|Horner, Sally G.
|Date of Defense
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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