SS2.05 Phylogenetic and Physiologic Successions in Aquatic Bacterial Communities
Date: Monday, June 10, 2002
Time: 4:30:00 PM
Location: Carson C
 
OlsonJB, University of Alabama, Tuscaloosa, USA, jolson@bama.ua.edu
Ward, A, K, University of Alabama, Tuscaloosa, USA, award@biology.as.ua.edu
 
EFFECT OF INCREASED INORGANIC NITROGEN AVAILABILITY ON RIVERINE MICROORGANISMS
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Recent studies have clearly shown that anthropomorphic activities have drastically increased the amount of inorganic nitrogen available in aquatic ecosystems. While we know that changes in water quality have had negative effects on the biodiversity of macroorganisms, there is little data on the responses of the microbial community to these changes. Water quality parameters, including inorganic nitrogen, have been recorded during the past year for sites along the Cahaba River, in central Alabama. These data demonstrate that the selected sites include pristine waters as well as locations with significant nutrient loading (e.g., near the mouth of a wastewater treatment plant). Preliminary data examining the microbial communities responsible for the various transformations of nitrogen (i.e., nitrogen fixation, nitrification, denitrification) suggest that molecular genetic analyses may be able to indicate which of these functional communities are present at each site and provide some background on the biodiversity within each functional community. This information will provide a baseline for further studies and will provide valuable information on possible effects of eutrophication on microbial community structure.