Overlap among cohabiting ciliates in their growth responses to various prey bacteria

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Abstract
The growth responses of 8 cohabiting species of bactivorous ciliates to 13 potential prey species (12 bacteria and 1 yeast) were examined in monoxenic cultures. Growth responses were scored simply as positive or negative. The mean number of prey species to which the ciliate species showed a positive growth response was 9.625 out of 13 or 74%. However, this proportion differed significantly among the ciliates. The observed pattern of responses did not reduce overlap among ciliates more than would be expected if the responses were independent.

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