Abstract
The adult emergence patterns and species distribution and abundance of Tipulidae in three woodland floodplains diffenng in size and in the diversity of vegetation were studied in southwestern Michigan during 1977. Adults and larvae were sampled by using emergence traps and core samples of leaf litter and humus, respectively. Twentyfour species of Tipulidae belonging to 15 genera were recorded from emergence trap samples. Adult emergence patterns among species groups were characterized and there were differences in species composition among floodplains. Abundance and distribution of larval tipulids were influenced by two closely related environmental factors: soil moisture and organic content. Adult distribution appeared to be influenced by factors affecting evaporation rate, that is, relative humidity, air movement, and insolation.
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