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The diversity of bacterial communities in CAP LTER soils Do spatial or land use gradients promote changes in bacterial community structure?



The diversity of bacterial communities in CAP LTER soils Do spatial or land use gradients promote changes in bacterial community structure?



Abstracts of the General Meeting of the American Society for Microbiology 103: N-370



Little is currently known about how bacterial communities in nature differ and what causes changes in community structure. Past molecular studies based on constructing 16S rRNA gene clone libraries of environmental samples have yielded insignificant conclusions due to the small numbers of clones generated, the relatively few numbers of libraries constructed, and the lack of statistics that apply to bacterial systems. This project attempts to answer questions in how diverse bacterial communities ecology are by increasing the magnitude of sampling. The Central Arizona-Phoenix Long Term Ecological Research (CAP LTER) site is suitable for this study due to its compactness as a geographical region (1642 km2) as well as its diversity in terms of land use. 16S rRNA gene clone libraries consisting of 500 or more clones have been generated from over 20 different samples of a wide range of areas at the CAP LTER as well as of various land use categories. Amplified Ribosomal DNA Restriction Analysis (ARDRA) was applied to all clones and unique banding patterns were sequenced for identification. Distributions of higher order taxa in the samples showed major differences in community composition in urban, desert remnant, open desert, and agricultural samples. Furthermore, spatial differences in communities were also observed no matter what scale was applied. Using the LIBSHUFF statistical method, bacterial community diversity appears to be influenced by the sample's land use category, but not necessarily on proximity. These trends suggest that there is a land use affect on the structure of bacterial communities in soils.

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