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A Caddisfly - Arctopsyche grandis
General Description
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Observations in Montana Natural Heritage Program Database
Number of Observations: 185
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Relative Density
Recency
(Observations spanning multiple months or years are excluded from time charts)
Habitat
Instream habitat: Hydropsychid larval populations can be very abundant in many Montana river aquatic communities. Larvae are restricted to moderate or fast flowing waters (very cold: Parapsyche--warmwater: Cheumatopsyche), living on cobbles/rocks, boulders or submerged logs
Food Habits
Larvae are omnivorous, and use a silken capture net to filter food particles from the flowing water column, including algae, organic particles (detritus) and small invertebrates.
Ecology
Hydropschidae caddisflies fill the filterer-collector ecological feeding niche of the stream and rivers where they reside. Larvae construct fixed retreats, incorporating plant fragments and mineral particles, on the upper surface or side of stable substrates (cobbles, boulders, logs). A silken capture net is also constructed, which is suspended in the current near the upstream entrance to the retreat. Larvae obtain oxygen from the water through paired ventral gills on each abdominal segment. Some species are able to tolerate fairly warm temperatures as long as they are highly oxygeated. Larval populations thrive at sites impacted by moderate organic enrichment. Their feeding method leads to the common name of ‘net-spinning caddis’.
Stewardship Responsibility
References
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Cushman, R.M. 2014. Biogeography of the caddisfly genus Arctopsyche McLachlan, 1868 (Trichoptera: Hydropsychidae) in North America. The Pan-Pacific Entomologist. 90(4):174-181.- Glorvigen, T.H. 1972. The responses of insect communities in the East Gallatin River, Montana, to sewage effluents. M.Sc. Thesis. Bozeman, Montana: Montana State University. 24 p.
- Gustafson, D. L. 1990. Ecology of aquatic insects in the Gallatin River drainage. Ph.D. Dissertation. Bozeman, MT: Montana State University. 194 p.
- Hauer, F. R. and J. A. Stanford. 1981. Larval specialization and phenotypic variation in Arctopsyche grandis (Trichoptera: Hydropsychidae). Ecology 62:645-653.
- Lohr, S.C. 1993. Wetted stream channel, fish-food organisms and trout relative to the wetted perimeter inflection point instream flow method. Ph.D. Dissertation. Montana State University, Bozeman. 246 p.
- Mcclay, W. 1968. Effects of controlled flow reductions on aquatic insects in a stream riffle. M.Sc. Thesis. Bozeman, MT: Montana State University. 29 p.
- Richards, D.C. 1996. The use of aquatic macroinvertebrates as water quality indicators in mountain streams in Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University. 192 p.
- Vincent, E.R. 1966. A comparison of riffle insect populations in the Gibbon River above and below the geyser basins, Yellowstone National Park. M.Sc. Thesis. Bozeman, MT: Montana State University. 19 p.
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