SS2.05 Phylogenetic and Physiologic Successions in Aquatic Bacterial Communities
Date: Thursday, June 13, 2002
Location: Poster Session - VCC
 
OteroE, University of Puerto Rico, MayagŁez, Puerto Rico, eotero2@coqui.net
 
MICROBIAL PATTERNS IN DIFFERENT TROPICAL SEASCAPES IN SOUTHWESTERN PUERTO RICO
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Coastal, benthic, geographic and climatic differences are widespread throughout the southwestern region of Puerto Rico. These differences are expected to influence inputs of terrestrial materials into coastal systems. Here is examined how seascape and hydrologic differences between study sites (Mayaguez Bay: anthropogenic and riverine inputs vs. La Parguera: coral reefs and mangrove inputs) are reflected on bacterial abundance (DAPI counts) and net production (Leucine incorporation: Leu-inc), picophytoplankton abundance (unicellular cyanobacteria (UC)), phytoplankton biomass (Chlorophyll a; Chla) and colored dissolved organic matter fluorescence (CDOM-Fl). The results indicate a tendency of higher Chla concentration in Mayaguez Bay especially during the wet season (September). La Parguera area showed a tendency towards higher UC numbers than Mayaguez Bay. This may indicate that the phytoplankton size distribution in La Parguera is shifted towards smaller cell sizes relative to phytoplankton in Mayaguez Bay. In general, bacterial production was higher during the low precipitation season (February) in both study areas. DAPI vs. Leu-inc curves indicate that terrestrial inputs to Mayaguez Bay during the period of maximum river flow do not enhance bacterial growth.