By J. E. H Martin
E-book by means of Martin, J. E. H
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Extra info for Collecting, preparing, and preserving insects, mites, and spiders (The Insects and arachnids of Canada)
The net rings described previously (p. 12) may be used for collecting aquatic insects, but special modifications will produce better results. It is important to use a net that offers as low as possible resistance to the water. 57 If you are capturing only medium-sized or large insects, select a material for the bag that has meshes just large enough to hold these insects. ) ring. Because most aquatic insects do not escape readily from a net after being taken from the water, the bag does not need to be deep; it may be shallower than the diameter of the ring.
Flotation methods give more complete and unbiased extractions than do Berlese extractors, hecause they do not depend on the reaction or mobility of the arthropods to a given stimulus such as desiccation or a repellent. By these methods, eggs, pupae, and other inactive stages can be collected. However, these methods are tedious, the mechanical processes of washing and sieving may damage delicate specimens, and specimens cannot be recovered alive for rearing. Also, arthropods containing a great amount of organic matter do not separate well because not all the debris is disposed of.
The type and style used depend on the needs of the collector. . '. - ~. '-" .. - .. -.... -::. Fig. 30. A separator box. 41 Searching This method of collecting is not used as often as it deserves, possibly because it is somewhat less productive of species and specimens than are certain other collecting methods. However, searching for and collecting individual specimens by hand is by far the most accurate and reliable way of finding out what species are associated with particular plants or habitats, and results in the acquisition of valuable biological data at the same time.