10.1007/BF00188248

doi:10.1007/bf00188248

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2011

DOI: 10.1007/bf00188248

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10.1007/BF00188248

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Cited by 11 publications

References 57 publications

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First evidence for photoperiodic regulation of the life cycle in a millipede species, Polydesmus angustus (Diplopoda: Polydesmidae)

David

Geoffroy²,

Célérier

2003

Journal of Zoology

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The hypothesis that the periods of dormancy previously described in the millipede Polydesmus angustus may be photoperiodically induced diapauses was tested experimentally. In this species, biennial individuals exhibit two successive periods of dormancy: aestivation in the penultimate stadium (stadium VII) and reproductive dormancy in the adults, which emerge in autumn. It was first established that the reproductive dormancy is not a thermally controlled state of quiescence. When adults emerging in autumn were kept at 16 • C under natural photoperiod, their reproduction was delayed for several months in comparison with adults emerging in spring at similar temperatures. This indicates that the reproductive dormancy begins with a period of diapause. Further experiments provided evidence of a photoperiodic induction of the adult diapause. When millipedes were reared under short day length (L:D 12:12 h) throughout their development, they required more time to reproduce than millipedes reared under long day length (L:D 16:8 h) at the same temperatures. Photoperiod influenced reproduction in females, but no significant effects were detected in adult males. On the other hand, stadium VII was markedly longer at L:D 16:8 h than at L:D 12:12 h in both sexes, which strongly suggests that aestivation is also induced by photoperiod. However, the effects on the duration of stadium VII varied among individuals, some of which showed no response to long days. This study is the first to document photoperiodic regulation of the life cycle in the class Diplopoda, a trait common in other classes of terrestrial arthropods.

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First evidence for photoperiodic regulation of the life cycle in a millipede species, Polydesmus angustus (Diplopoda: Polydesmidae)

David

Geoffroy²,

Célérier

2003

Journal of Zoology

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Interactive effects of photoperiod and temperature on diapause induction and termination in the yellow‐spotted longicorn beetle, Psacothea hilaris

Asano

Munyiri

Shintani

et al. 2004

Physiological Entomology

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Abstract. The interactive effects of temperature (20 °C or 25 °C) and photoperiod (LD 12 : 12 h or LD 15 : 9 h) on diapause induction and termination are investigated in the west‐Japan type yellow‐spotted longicorn beetle, Psacothea hilaris (Pascoe) (Coleoptera: Cerambycidae). Larval diapause of P. hilaris is induced under three diapause‐inducing conditions (20 °C–SD, 20 °C–LD and 25 °C–SD), and the diapause larvae are transferred to one of four conditions (20 °C–SD, 20 °C–LD, 25 °C–SD or 25 °C–LD) for observation of pupation, which indicates termination of diapause. The intensity of diapause induced under the three conditions increases in the order 20 °C–SD < 25 °C–SD < 20 °C–LD, when assessed by the time course of pupation after the transfer. On the other hand, the effectiveness of the temperature–photoperiod combinations to terminate diapause is in the order 25 °C–SD (ineffective) < < 20 °C–LD < 25 °C–LD < 20 °C–SD. Among the temperatures (5, 10, 15 and 20 °C) examined, 15 °C is the most effective in terminating diapause under the short day; diapause in most larvae appears to have been completed in 15 days.

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Thermal response and reversibility of diapause in the eggs of Locusta migratoria

Ando

1993

Physiological Entomology

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Abstract. Eggs of a local population of Locusta migratoria L. (Orthoptera: Acrididae) collected near Hirosaki (40.5oN) entered diapause when incubated at temperatures between 20 and 35oC. For diapause development the optimum temperature was 10oC. The lower thermal threshold for post‐diapause development was 14.7oC. After chilling at 10oC for 20 days, the rate of hatching varied with incubation temperature, being 0, 61% and 81% at 20, 25 and 30oC, respectively. After chilling for 40 days or more, however, almost all eggs hatched at 20–30oC. Diapause with a reduced intensity seemed to be eliminated easily by a high temperature of 25 or 30oC. When eggs chilled at 10oC for 20 days were kept at 20oC for 7 days or more before incubation at 25oC, almost all eggs maintained diapause. Most eggs chilled at 10oC for three 10 day periods separated by 3 days of warming at 25oC failed to terminate diapause. Daily alternations of 10oC (18 h) and 25oC (6h) decreased the diapause‐terminating effect of chilling. These facts suggest that diapause intensity can be restored if eggs chilled insufficiently are exposed to a moderately high temperature. This reversible change in diapause intensity would play an important role in maintaining diapause before winter.

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10.1007/BF00188248

Cited by 11 publications

References 57 publications

First evidence for photoperiodic regulation of the life cycle in a millipede species, Polydesmus angustus (Diplopoda: Polydesmidae)

First evidence for photoperiodic regulation of the life cycle in a millipede species, Polydesmus angustus (Diplopoda: Polydesmidae)

Interactive effects of photoperiod and temperature on diapause induction and termination in the yellow‐spotted longicorn beetle, Psacothea hilaris

Thermal response and reversibility of diapause in the eggs of Locusta migratoria

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