An engaging little caddisfly that is often found associated with coniferous forest streams is Philopotamus montanus. The larvae live in fast moving streams, spinning long, tubular, bag-like nets on the undersides of rocks which they use to catch diatoms and detritus (3). The clumsy, slow flying adults rarely venture far from these streams and are on the wing from May to August (however the individuals pictured were photographed in April). However the occurrence of P. montanus in forest streams is very much dependent on its management. Specifically, it requires small rocky streams with hard margins (2). Therefore it is essential to take these needs into account when laying out commercial forests near streams if we are to keep these little brown and yellow winged wonders for the future.
- Weatherley et al., 1993. Biological Conservation 63 171-176
- Gibbons, 2010. Insects of Britain and Europe p. 143