Geographical variability in the photoperiodical reaction of the noctuid moth Euclidia gliphica (Linnaeus, 1758)
Euclidia gliphica is the widespread Palearctic species. It has one generation, overwintering in the larval stage in Germany [Koch 1958]. Imago are recorded from May to July. Pyatigorsk and SaintPetersburg populations of this moth were investigated. During the experiment it was established that...
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| Formato: | article |
| Lenguaje: | RU |
| Publicado: |
Russian Academy of Science. Southern Scientific Centre. Federal Research Centre
2006
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/a3747a3f9164422e9cb24b6d9f7b341c |
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| Sumario: | Euclidia gliphica is the widespread
Palearctic species. It has one generation, overwintering
in the larval stage in Germany [Koch 1958]. Imago
are recorded from May to July. Pyatigorsk and SaintPetersburg
populations of this moth were investigated.
During the experiment it was established that the winter
pupal diapause in this species is not obligate, however the
tendency to dormant state is very powerful. Under the
temperature 24,4 °С and with the maximal day length 18
h, 80% of the pupi in Pyatigorsk population and 100% of
the pupi in Saint-Petersburg population fell to the diapause.
The investigation of the role of the daily temperature
fluctuations (outdoors variants for both populations)
revealed that the percentage of the diapausing insects was
considerably lower: to 60% in the Pyatigorsk population
and to 80% in the Saint-Petersburg population. Outdoors
variants of the experiment was investigated from the
beginning of July to the middle of August. In this period the
day length was decreasing from 16 to 15.5 h. With this day
length and constant temperature 24.4 °С the percentage of
the diapausing insects in both populations was more than
90%. This explains the appearance of the active insects in
first generation and, in turn, provides an opportunity for
the second generation in these regions. It is possible, that
in warm years, the number of active pupi can increase,
but, according to the parameters of the photoperiodical
reaction, a significant diapausing fraction will constantly
present in the first generation |
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