Hypotheses for the distribution of fungi that are nutritionally important to Drosophila larvae.

The amount of overlap in fungal community composition among plant host substrates would be expected to vary under the different hypotheses described in detail in the main text, as would the precision with which adult flies would need to be able to detect specific substrates for oviposition. Fungi not important to larval development are not considered here, although they may constitute a large proportion of the fungal diversity present on a given substrate.