Characterization and Analysis of the Native Hindgut Flora of Periplaneta americana Using a Culture Independent Analysis
Strong, Thomas A.
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The American Cockroach (Periplaneta americana) is a common insect found throughout the world. Previous studies have shown that within the American Cockroach's gastrointestinal (GI) tract harbors an immensely complex micro flora. Earlier studies have employed various techniques to characterize the microflora of the American Cockroach ranging from scanning and transmission electron microscopes to the use of selective and non-selective medium. The aim of this study is to advance our understanding of the diversity and structure of the American Cockroach's hindgut microflora through the use of 16S rRNA gene amplification, which is a culture independent method. Four independent hindgut samples were sequenced in order to compare the individual hindgut communities and identify the most common bacteria present in each sample. The total number of identified bacterial members were 236 phylotypes, mainly belonging to three bacterial phyla: Bacteroidetes, Firmicutes, and Proteobacteria, which are also known to be present in the GI tract of humans. The Shannon-Weaver and Simpsons diversity indexes showed an even distribution in three samples; however, in the forth sample, the Shannon-Weaver showed the lowest index number, while, the Simpson diversity index was highest, suggesting the presence of high numbers of strains and sub-strains present in this sample.
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