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Biol Bull 136: 2-8. (February 1969)
© 1969 Marine Biological Laboratory
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MAJOR ENVIRONMENTAL FACTORS INDUCING THE TERMINATION OF LARVAL DIAPAUSE IN CHAOBORUS AMERICANUS JOHANNSEN (DIPTERA: CULICIDAE)

WILLIAM E. BRADSHAW 1

1 Department of Zoology, The University of Michigan, Ann Arbor, Michigan 48104

1. The termination of larval diapause in C. americanus is cued by simultaneous long day and food.

2. One long day cycle with food elicits development in a significant proportion of the population.

3. A shift in the major developmental stimulus from long day during the winter to food after prolonged chilling in the laboratory was observed and is hypothesized to be an adaptation to life in shallow ponds in temperate climatic regions.

4. The action of food may occur via the ventral abdominal nervous system as described by Füller (1960) with ultimate neuro-endocrine control of development residing in the brain.




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W. E. Bradshaw
Action Spectra for Photoperiodic Response in a Diapausing Mosquito
Science, March 24, 1972; 175(4028): 1361 - 1362.
[Abstract] [PDF]


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