Attractivity of various artificial light sources to caddisfly (Trichoptera) species and its importance in their sampling and conservation

Abstract The artificial light sources are useful tools for sampling night active insects, however, they also possess potential environmental risks in their habitats. To test applicability and evaluate risk caddisflies (Trichoptera), the attractivity of different portable traps working with LED, UV mixed-white was studied compared traditionally used mercury-vapour lamp (in Jermy-type trap), which is tool street-light. Analysing 1135 caught individuals 19 species emitting wavelength spectra showed selectivity on both family levels. Attractivity generally lower than other tested sources. We found that most attractive range between 360 407 nm. One LED lamps together could cover this spectrum a high wide spectral peak source 375 391 nm resulted additional catches considering number individuals. Lamps may be dangerous pollution along lowland water courses where sampled common widespread.