1887

Abstract

Clustering and ordination were used to analyze the results of a study involving phenotypic characterization (61 tests) of 197 strains of gram-negative, oxidase-positive, rod-shaped bacteria isolated from carcharhinid sharks. Also included in the data set were data for 39 reference strains representing the genera , and . Unweighted pair group mathematical averaging cluster analysis resolved nine major groups of operational taxonomic units (OTUs) at simple matching coefficient (S) values of ≥66.5%. In turn, each group contained one or more OTU clusters (phena) at S values of ≥72.6%. A total of 27 phena were resolved; 14 phena were identified as species and contained 182 of the 236 OTUs in the study. Additional phena were identified as members of the genus (two phena), the genus (three phena), the genus (two phena), and (one phenon). One phenon resembled descriptions of the genera and and . The remaining four phena were not identified. The largest phena were identified as (52 OTUs) and (48 OTUs). and formed subclusters (S values, ≥82%) within the third largest phenon (24 OTUs), which was resolved at an S value of ≥72.6%. Human pathogens (e.g., ) and fish pathogens (e.g., , and were isolated from the sharks. Approximately 58% of all of the strains isolated and tested in this study were urease positive.

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1993-01-01
2024-03-29
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