PHOTOPERIODIC AND TEMPERATURE REGULATION OF DIAPAUSE INLABIDOCERA AESTIVA(COPEPODA: CALANOIDA)
نویسندگان
چکیده
منابع مشابه
Photoperiodic regulation
Adult male wild rabbits were exposed to artificial daylengths of 8L:16D, 13L:1 1D or 20L:4D after being taken from the wild during September, when testicular size was minimal. In all groups the testes grew and those in 20L:4D grew more quickly than did those in 8L:16D or 13L:11D. Rabbits kept in the 3 daylength treatments for the whole study maintained enlarged testes after the initial growth p...
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The fruit fly Drosophila melanogaster displays an ovarian diapause that is regulated by photoperiod. Newly eclosed female flies (Canton-S wild type) exposed to short days (less than 14 hr of light per day) at 12 degrees C (or 10 degrees C) enter a fairly shallow reproductive diapause. Females exposed to long days (16 hr of light per day) at the same low temperature undergo ovarian maturation. T...
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Effects of long day and short day treatments during the embryonic and larval stages on induction of pupal diapause were studied on a diapausing race of Sarcophaga peregrina. Two long day (15L 9D) cycles during 2 days before or after the larviposition completely stopped the induction of pupal diapause on larvae which grow in short day condition before and after the long day treatment. The sensit...
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The universal occurrence of photoperiodism in insects is due to convergentevolution. The neuroendocrine system, playing the central role in the photoperiodicresponse, gives diversified terminal expressions of adaptive significance. The responsecurve reflects the distributions of individual threshold photoperiods in three differentranges corresponding to the minimum number of dar...
متن کاملGeographic Variation of Diapause and Sensitive Stages of Photoperiodic Response in Laodelphax striatellus Fallén (Hemiptera: Delphacidae)
Large numbers of the small brown planthopper Laodelphax striatellus (Fallén) (Hemiptera: Delphacidae) occur in temperate regions, causing severe losses in rice, wheat, and other economically important crops. The planthoppers enter diapause in the third- or fourth-instar nymph stage, induced by short photoperiods and low temperatures. To investigate the geographic variation in L. striatellus dia...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1982
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1540969