SS2.06 Microbial Diversity in Time and Space
Date: Tuesday, June 11, 2002
Time: 10:00:00 AM
Location: Lecture Theatre
 
JeffreyWH, University of West Florida, Pensacola, USA, wjeffrey@uwf.edu
Pakulski, J, D, University of West Florida, Pensacola, USA, jpakulski@uwf.edu
Kase, J, P, University of West Florida, Pensacola, USA, 
Durkin, S, , University of West Florida, Pensacola, USA, 
 
THE ROLE OF COMMUNITY STRUCTURE IN DETERMINING BACTERIOPLANKTON RESPONSE TO ULTRAVIOLET RADIATION
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Inhibition of bacterioplankton production from solar UVR has been widely reported. One goal is to generate models to estimate the effect on production due to ozone depletion. Attempts to model a universal response have proved difficult owing to spatial and temporal variations in the response to UVR. One contributing factor may be differences in bacterioplankton community structure between samples. We investigated effects of UVR on bacterial production during seasonal and latitudinal changes in solar UVR. Seasonal samples were collected near Palmer Station, Antarctica and latitudinal response in surface waters collected in the Southeast Pacific Ocean. Palmer Station samples indicated decreasing sensitivity to UVR with increasing daylength. DGGE analysis of 16S rDNA suggested minimal changes in community structure during the sampling period. Geographical trends generally indicated that bacterioplankton were less sensitive to UVR with increasing solar radiation. DGGE demonstrated significant changes in community structure. Other factors which may have affected UVR response and community structure included temperature and nutrients. These data suggest that community structure and function vary both temporally and spatially and are important for generating models on bacterioplankton processes.