Abstract
Seasonal and successional changes in species composition of aquatic hyphomycetes colonizing leaf litter are reported from a small stream in southwestern Michigan, U.S.A. The successional pattern on leaves during the summer was dominated by species typical of tropical and subtropical streams and differed from a cold-season successional pattern at the same site. The spring transition from cold-season to summer species occurred as the maximum temperature approached 20°. In the autumn, cold-season species again assumed dominance as the minimum temperature decreased to 5 °C. The summer successional pattern compared at three sites with different temperatures indicated that cold-season fungal species were dominant at the two cooler, upstream sites. The summer assemblage dominated at the downstream site, and was not detected at either upstream site. Temperature growth responses in culture only partially explain seasonal occurrence, suggesting that interactions among aquatic hyphomycetes play a role in regulating seasonal occurrence.
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