By J. E. H Martin
Booklet by means of Martin, J. E. H
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Extra resources for Collecting, preparing, and preserving insects, mites, and spiders (The Insects and arachnids of Canada)
To prevent excessive amounts of detritus 47 Fig. 36. A Berlese funnel. from being brought down the funnel by the activity of the specimens, place a grid, screen, or baffle (Fig. 37) between the sample holder and the collection bottle. Experience has shown that these filtering devices produce a cleaner sample of organisms, which greatly aids in the final sorting and mounting of specimens from the sample. However, these barriers must not be so elaborate that they prevent the arthropods from moving down the funnel.
Deep, are commonly used for pan traps, but almost any suitable size of container will do; in locations where someone may steal the pans, use sheets of plastic or aluminum foil. Set the pans in the ground with their tops flush with the surface. Fill them with water and add a small amount of detergent, which acts as a wetting agent, and 1-3 % Formalin, which acts as a killing and preserving agent. If evaporation is a problem, as in hot or windy locations, or if the traps are left untended for long periods, up to 90% of the water may be replaced by ethylene glycol, which does not evaporate.
Funnel traps showing detail of collecting chamber.
Collecting, preparing, and preserving insects, mites, and spiders (The Insects and arachnids of Canada) by J. E. H Martin