The caddisfly assemblages of Finch Creek, a small woodland stream in northern Lower Michigan, was sampled along its entire continuum during May, June, July, and September 2021–2022 using ultraviolet blacklight traps. A total of 98 species representing 15 families and 49 genera were collected, including two species [Lepidostoma prominens (Banks) and L. sommermanae (Ross)] not previously reported from Michigan, and several others either not previously found in the Lower Peninsula or not reported from the state for >70 years. A non-metric multidimensional scaling ordination determined distinct species assemblages corresponding to the spring, summer, and fall months. Shredders dominated the assemblages of nearly all sites and seasons, with 60–90% of assemblage total organic biomass. Changes in caddisfly functional feeding group biomass approximated those predicted by the river continuum concept, except for an unexpected decrease in scrapers as the stream widened, possibly due to high sediment input into the creek. In addition to the new species records, this study further validated the use of caddisfly adults to assess aquatic ecosystems and demonstrated the dominance of shredders in small temperate woodland streams.
Houghton, David and Haack, Robert
"The Caddisflies (Trichoptera) of Finch Creek, Antrim County, Michigan (USA),"
The Great Lakes Entomologist, vol 56
Available at: https://scholar.valpo.edu/tgle/vol56/iss1/8