By J. E. H Martin
Booklet through 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)
The trap captures most of the aquatic insects living at these depths, retaining both the adults and pupal exuviae. Throughout a season, several of these traps set at various depths will collect samples of the insects living in the deeper parts of a lake. To anchor your traps, suspend them from a line laid out between two fixed buoys. See the list of suggested references for other submerged emergence traps that have been developed on the same principle as the funnel trap. Fig. 54. Funnel traps showing detail of collecting chamber.
Aquatic traps and sampling devices are referred to briefly in this publication. For further information see Southwood (1966), Edmondson and Winberg (1971), and others listed in the reference section at the end of this publication. Lentic environment traps A funnel trap (Fig. 54) is most commonly used as a submerged emergence trap. It consists of a funnel with a glass jar at its apex. As the trap is lowered into the water, air is trapped in the jar. Ascending pupae entering the funnel pass up into the jar, and adults emerge into the enclosed air space.
Design and construction of a wooden baffle. Bulbs of over 100 W may kill many of the light, sclerotized, slower moving arthropods, whereas bulbs of under 40 W take too long to produce satisfactory results. ) upper diam with a light bulb of 60 or 100 W process well in about 2 days. Samples of this size usually yield members of species that occur even sparsely in the habitat. A lid or hood that closes over the light bulb and the sample holder of the funnel is advantageous in several ways: the heating effect and desiccation gradient are more pronounced; organisms capable of jumping or flying out of the sample are prevented from doing so; contaminant organisms (particularly flying nocturnal insects that often carry mites) attracted to the light or to the odor of the sample in the -funnel are excluded; and funnels being used outdoors are protected against rain or other falling objects.
Collecting, preparing, and preserving insects, mites, and spiders (The Insects and arachnids of Canada) by J. E. H Martin
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