The presence of large numbers of mango trees seemed to negatively affect the abundance and diversity of dolichopodids along some Montserrat streams A Fogarty Ghaut seems an ideal place for Dolichopodidae, but few were found B large numbers of mango fruit and leaves filled the stream and stream sides in Fogarty Ghaut, suggesting that chemicals from this material could be killing aquatic or semi-aquatic insects. Photographs by Justin Runyon.