Zum Einfluß von Photoperiode und Temperatur auf die Entwicklung des Kupferstechers, Pityogenes chalcographus L. (Col., Scolytidae)

Führer, E.; Chen, Ze Yu

doi:10.1007/bf02743103

Cited by 10 publications

(4 citation statements)

References 2 publications

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“…At 20°C, diapause occurred in 50% of insects grown since the egg at a day length of 14.7 ± 0.1 h. This is longer in comparison with a previous report (Schopf 1989) and reflects the upland origin of the examined population. Our insects grown at L:D 12:12 entered diapause at the rearing temperature 20–22°C but not 23 or 25°C (table 2), similar to the distinction between 20 and 24°C in Pityogenes chalcographus (Führer and Chen 1979). The suppression of diapause induction at high temperatures indicated that I. typographus is virtually insensitive to photoperiod during the hot summer months when its population growth reaches a peak.…”

Section: Discussionsupporting

confidence: 73%

Effects of photoperiod and temperature on the development and diapause of the bark beetle Ips typographus

Doležal

Sehnal

2007

J Applied Entomology

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Diapause was induced in a Central European population of Ips typographus grown at 20°C when the day length decreased below 16 h [50% diapause incidence occurred in the 14.7:9.3 h L:D (light:dark) regime]. The nondiapausing adults fed on days 2-6 and 10-14 after the ecdysis and swarmed after the second feeding bout with chorionated eggs in the ovaries and sperm in the spermiducts. Neither gonads nor the flight muscles matured and no swarming occurred in the diapausing adults. The development from egg to adult took about 34 days in both 18:6 h (no diapause) and 12:12 h L:D (diapause) regimes, but it was extended by up to 30% without diapause induction when only larvae or pupae were exposed to L:D 12:12 h. Diapause was induced in insects reared at L:D 12:12 h through the last larval and the pupal instars and/or in the adult stage. Temperature ‡ 23°C prevented diapause induction at L:D 12:12 h but diapause occurred at L:D 14:10 h associated with 26:6°C thermoperiod. The effect of thermoperiods on the developmental rate requires further research. Exposure of the non-diapausing adults to 5°C for several days blocked feeding and evoked a diapause-like state, whereas diapausing adults fed and their gonads slowly developed at this temperature. Diapausing adults exposed in forest to low night temperatures and transferred in October to 20°C readily reproduced at 18:6, but not 12:12 h L:D photoperiods. After 2-months at 5°C and darkness, they became insensitive to the photoperiod, matured and most of them also swarmed at 20°C in the 12:12 h L:D regime. In a Scandinavian population, diapause occurred at 18:6 h L:D and was terminated either by exposure to 5°C or by very long photoperiod (L:D 20:4 h) combined with high temperature (23°C).

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Section: Discussionsupporting

confidence: 73%

Effects of photoperiod and temperature on the development and diapause of the bark beetle Ips typographus

Doležal

Sehnal

2007

J Applied Entomology

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“…The life histories of I. typographus and D. rufipennis are strongly influenced by seasonal events and they respond with similar physiological strategies. For example, both species enter diapause to buffer against harsh winter conditions and to synchronize life cycles, a widespread strategy in insects that is described for multiple bark beetle species (Ryan, ; Scott & Berryman, ; Birch, ; Führer & Chen, ; Gehrken, ; Schopf, ; Sieber & Benz, ; Langor & Raske, , b; Schopf, ; Hansen et al ., ; Doležal & Sehnal, ; Lester & Irwin, ; McKee & Aukema, ; Gent et al ., ). In addition, voltinism of both species is influenced by differing diapause strategies.…”

Section: Introductionmentioning

confidence: 99%

Diapause and overwintering of two spruce bark beetle species

et al. 2017

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Diapause, a strategy to endure unfavourable conditions (e.g. cold winters) is commonly found in ectothermic organisms and is characterized by an arrest of development and reproduction, a reduction of metabolic rate, and an increased resistance to adversity. Diapause, in addition to adaptations for surviving low winter temperatures, significantly influences phenology, voltinism and ultimately population growth. We review the literature on diapause and overwintering behaviour of two bark beetle species that affect spruce‐dominated forests in the northern hemisphere, and describe and compare how these strategies can influence population dynamics. The European spruce bark beetle Ips typographus (L.) (Coleoptera, Curculionidae) is the most important forest pest of Norway spruce in Europe. It enters an adult reproductive diapause that might be either facultative or obligate. Obligate diapausing beetles are considered strictly univoltine, entering this dormancy type regardless of environmental cues. Facultative diapausing individuals enter diapause induced by photoperiod, modified by temperature, thus being potentially multivoltine. The spruce beetle Dendroctonus rufipennis (Kirby) (Coleoptera: Curculionidae) infests all spruce species in its natural range in North America. A facultative prepupal diapause is averted by relatively warm temperatures, resulting in a univoltine life cycle, whereas cool temperatures induce prepupal diapause leading to a semivoltine cycle. An adult obligate diapause in D. rufipennis could limit bi‐ or multivoltinism. We discuss and compare the influence of diapause and overwinter survival on voltinism and population dynamics of these two species in a changing climate and provide an outlook on future research.

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“…Pityogenes chalcographus seems to enter a photoperiodically regulated diapause in the adult stage as well (Führer and Chen, 1979). Developmental studies under long-day and short-day conditions at different temperatures showed that all individuals of a generation emerge from their breeding systems at warmer conditions with only a minor influence of photoperiod.…”

Section: Comparison Of Selected Life-history Traitsmentioning

confidence: 99%

“…Developmental studies under long-day and short-day conditions at different temperatures showed that all individuals of a generation emerge from their breeding systems at warmer conditions with only a minor influence of photoperiod. At lower temperatures, however, a distinct influence of day length on development was described, suggesting a photoperiodically mediated diapause which is modified by warm temperatures (Führer and Chen, 1979). This would be a similar mechanism as described in I. typographus (Schopf, 1985, 1989; Dolezal and Sehnal, 2007), however, additional studies are necessary to get a comprehensive picture.…”

Section: Comparison Of Selected Life-history Traitsmentioning

confidence: 99%

Evolutionary ecology of the bark beetlesIps typographusandPityogenes chalcographus

Schebeck

Schopf

Ragland

et al. 2022

Bull. Entomol. Res.

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Ips typographus (L.) and Pityogenes chalcographus (L.) (Coleoptera: Curculionidae) are two common bark beetle species on Norway spruce in Eurasia. Multiple biotic and abiotic factors affect the life cycles of these two beetles, shaping their ecology and evolution. In this article, we provide a comprehensive and comparative summary of selected life-history traits. We highlight similarities and differences in biotic factors, like host range, interspecific competition, host colonization, reproductive behaviour and fungal symbioses. Moreover, we focus on the species' responses to abiotic factors and compare their temperature-dependent development and flight behaviour, cold adaptations and diapause strategies. Differences in biotic and abiotic traits might be the result of recent, species-specific evolutionary histories, particularly during the Pleistocene, with differences in glacial survival and postglacial recolonization. Finally, we discuss future research directions to understand ecological and evolutionary pathways of the two bark beetle species, for both basic research and applied forest management.

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Zum Einfluß von Photoperiode und Temperatur auf die Entwicklung des Kupferstechers, Pityogenes chalcographus L. (Col., Scolytidae)

Cited by 10 publications

References 2 publications

Effects of photoperiod and temperature on the development and diapause of the bark beetle Ips typographus

Effects of photoperiod and temperature on the development and diapause of the bark beetle Ips typographus

Diapause and overwintering of two spruce bark beetle species

Evolutionary ecology of the bark beetlesIps typographusandPityogenes chalcographus

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