M.: The use of baits and preservatives in pitfall traps. The natural mortality of the young stages of Pieris. P.: The control of Pieris rapae with DDT. M.: Distribution and movement of adult false wireworms in a wheat field. B.: A comparison of pitfall trapping and soil sampling in assessing populations of two species of ground beetles (Col.: Carabidae). 78, 215–236 (1970)īorg, A.: Forekomsten av carabider i en jordgubbsodling (Col. A.: Phenology and distribution of some Pterostichus (Coleoptera: Carabidae) of eastern Canada. A.: Ecological factors affecting population sampling of desert tenebrionid beetles. The observed differences, between types of trap, in capture and retaining efficiencies accounted for some, but not all, of the variations in catch found in the field.Īhearn, G. Large beetles escaped most from small traps, and small beetles from large ones. Escape was negligible from glass-sided traps, but was about 4% per day from plastic traps, and 10% from metal ones. The rate of escape, from each type of trap, of small, medium and large sized Carabidae was tested. Traps caught about 75% of beetles that contacted their perimeter only small traps caught small beetles efficiently the largest species was caught poorly by nearly all traps. The capture efficiency of each type of trap was tested in the laboratory, using six species of Carabidae. Small traps were most efficient in catching small species, whereas large traps caught relatively more large beetles. Glass traps were most efficient in proportion to their size plastic and metal traps had a reduced catch. Formulae are given for the reduction in catch per trap when traps are placed close together in a grid.įield experiments compared the catch of six types of trap, from 2.5 cm diameter glass tubes, to 2 m long sections of guttering. It is shown theoretically that the catch of circular and rectangular traps can be compared on a basis of their perimeter lengths. Some of the trap features influencing the ability of pitfall traps to catch Coleoptera, especially Carabidae, were investigated by field and laboratory experiments.
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