Ciba Foundation Symposium 104 - Photoperiodic Regulation of

Chapter 1 Chairman's advent (page 1): William Mordue
Chapter 2 creation: The hyperlinks among ‘Wet’ and ‘Dry’ body structure (pages 2–6): David S. Saunders
Chapter three solidarity and variety in Insect Photoperiodism (pages 7–25): Sinzo Masaki
Chapter four The Circadian part in Photoperiodic Induction (pages 26–47): C. S. Pittendrigh, J. Elliott and T. Takamura
Chapter five Photoperiod Reception in Spider Mites: Photoreceptor, Clock and Counter (pages 48–64): A. Veerman and M. Vaz Nunes
Chapter 6 Long?Night Summation and Programming of Pupal Diapause within the Flesh?Fly, Sarcophaga argyrostoma (pages 65–96): David S. Saunders and Helen Bradley
Chapter 7 Genetic research of Geographical version in Photoperiodic Diapause and Pupal Eclosion Rhythm in Drosophila littoralis (pages 97–114): Pekka Lankinen and Jaakko Lumme
Chapter eight Neuronal association of a Circadian Clock within the Cockroach Leucophaea maderae (pages 115–135): Terry L. Page
Chapter nine Circadian?Clock regulate of Hormone Secretion in Samia Cynthia ricini (pages 136–149): Hironori Ishizaki, Akira Mizoguchi and Mariko Fujishita
Chapter 10 Circadian keep an eye on of Haemolymph Ecdysteroid Titres and the Ecdysis Rhythm in Rhodnius prolixus (pages 150–169): C. G. H. metal and E. J. Ampleford
Chapter eleven Photoperiodic rules of Prothoracicotropic Hormone unencumber in overdue Larval, Prepupal and Pupal phases of Sarcophaga bullata (pages 170–188): Brian Roberts
Chapter 12 Reproductive Endocrinology and Photoperiodism in a Terrestrial Slug (pages 189–203): P. G. Sokolove, E. J. McCrone, J. van Minnen and W. C. Duncan
Chapter thirteen Photoperiodicity, Rhythmicity and Endocrinology of replica within the Snail Lymnaea stagnalis (pages 204–220): J. Joosse
Chapter 14 Physiological points of the 2 Oscillators That keep an eye on the Timing of Eclosion in Moths (pages 221–239): James W. Truman
Chapter 15 A hormonal foundation for the Photoperiodic keep watch over of Polymorphism in Aphids (pages 240–258): Jim Hardie
Chapter sixteen Environmental signs, the Neuroendocrine procedure, and the law of Larval Diapause within the Southwestern Corn Borer, Diatraea grandiosella (pages 259–275): G. Michael Chippendale

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If the amplitude of the response to the same timemeasurement were changed, the 50% response would occur at a different photoperiod. Reynolds: The problem here is surely that diapause is an all-or-none response and that a proportion of the population is becoming incapable of showing that response. In that case, one ought to measure the critical daylength for 50% diapause induction in thatproportion of the population that is INSECT PHOTOPERIODISM 23 susceptible. The trouble is, of course, we do not know which insects are susceptible!

The merit of external coincidence is its focus on the entrainment mechanism; the focus of internal coincidence is on changing temporal order (phase-relation of constituent oscillators) in a multi-oscillator circadian system. There is now strong evidence that the pacemaker of vertebrate circadian systems is a complex of two mutually coupled oscillators, one of which (E) is entrained principally by evening lighr and the other (M) by morning light (Pittendrigh 1974, Daan & Pittendrigh 1976). As sundown and dawn come close together in summer, the phase-relation between the constituent oscillators is reduced.

Can J Bot 432325-853 Daan S, Pittendrigh CS 1976 A functional analysis of circadian pacemakers in noctural rodents. 11: The variability of phase response curves. J Comp Physiol 106:253-266 Danilevskii AS 1957 Photoperiodism as a factor in the formation of geographical races of insects. Entomol Obozr 36:6-27 Elliott JA 1981 Circadian rhythms, entrainment and photoperiodism in the Syrian hamster. In: Follett BK, Follett DE (eds) Biological clocks in seasonal reproductive cycles. Wright, Bristol, p 203-217 Engelmann W, Mack J 1978 Different oscillators control the circadian rhythm of eclosion and activity in Drosophilu.

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