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Electronic fraction collector used for insect sampling in the photoperiod‐induced diel emergence of bark beetles
Author(s) -
BYERS JOHN A.
Publication year - 1983
Publication title -
physiological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 57
eISSN - 1365-3032
pISSN - 0307-6962
DOI - 10.1111/j.1365-3032.1983.tb00342.x
Subject(s) - diel vertical migration , biology , timer , bark (sound) , photoperiodism , botany , fraction (chemistry) , insect , horticulture , ecology , electrical engineering , engineering , chemistry , organic chemistry , microcontroller
. An electronic timer and fraction collector consisting of CMOS integrated circuits is described. It converts 50‐ or 60‐Hz AC to real‐time pulses in programmable whole‐number increments (1, 10 or 60s) from 3 to 16659, producing timing periods from 3 s to more than 11 days. The fraction collector contains a leaf‐switch feedback circuit that automatically adjusts to various gear motor speeds and sample tube spacings so that proper positioning results. Hourly collections by the device of the bark beetles Ips typographus L. and Pityogenes chalcographus L. (Scolytidae) emerging from logs of Norway spruce, Picea abies , indicated that both species emerged with a diel periodicity. A unimodal emergence peak for both sexes of both species occurred at midday in LD 20:4 at a constant 25°C and 80% r.h.