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Rarefaction curves for the different phylotypes of rDNA-RIS clones. The number of different phylotypes in each clone library was determined by RIS-RFLP using MspI and MboI in separate restriction digestions. Rarefaction curves were calculated with the analytical approximation algorithm described by Hurlbert (22). Symbols: □, SEP-0; ▵, SEP-3; ○, SEP-6.
