Effects of spatio-temporal intervals between newly-hatched larvae on larval survival and development inMonochamus alternatus (Coleoptera: Cerambycidae) |
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Authors: | Anbutsu Hisashi Togashi Katsumi |
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Institution: | (1) Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima, 739 Hiroshima, Japan |
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Abstract: | The effects of distance between hatching larvae on survival and development were investigated inMonochamus alternatus. Two newly-hatched larvae were inoculated intoPinus densiflora bolts at a distance of 2.5 cm or 10 cm, simultaneously or at an interval of 2 weeks. Some larvae were inoculated singly as
a control. When larvae were inoculated simultaneously, mortality of the closely-inoculated larvae was significantly higher
than that of distantly-inoculated larvae. Such high mortality was identified as due to conspecific bites. When the two larvae
were inoculated asynchronously, the first-inoculated larvae killed some second-inoculated larvae but were never killed by
them. Consequently, mortality was higher in second-inoculated larvae than in first-inoculated larvae. In particular, there
was a significant difference in mortality between them when the larvae had been inoculated closely. The mortality of second-inoculated
larvae was higher in the closely-inoculated group than in the distantly-inoculated group although there was no significant
difference between them. In the case of two simultaneously-inoculated larvae, the initial distance between them had no significant
effect on the development and growth in the early larval stage. When the larvae were inoculated asynchronously, the first-inoculated
larvae grew more quickly than singly-inoculated control larvae. |
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Keywords: | conspecific bites intraspecific competition larval mortality Monochamus alternatus oviposition scar |
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