DIAPAUSE IN A MIGRANT INSECT, MILKWEED BUG ONCOPELTUS-FASCIATUS (DALLAS) (HEMIPTERA-LYGAEIDAE)
DIAPAUSE IN A MIGRANT INSECT, MILKWEED BUG ONCOPELTUS-FASCIATUS (DALLAS) (HEMIPTERA-LYGAEIDAE)
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DOI：
10.1007/bf00345090
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发表时间：
1974-01-01
期刊：
影响因子：
2.7
通讯作者：
DINGLE, H
中科院分区：
文献类型：
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作者：
DINGLE, H
筋膜Oncopeltus fasatusus表现出由短光周期触发的兼性生殖滞育。触发光周期（“临界光周期”）的持续时间是种群饲养环境条件的函数。有些个体在早期对关键光周期明显敏感，但最大敏感性（100%滞育）发生在5龄后期，即pharate成虫发育期间。60%的人在成年后的头五天仍保持敏感。27°C的温度可以防止滞育。滞育一旦开始，可以通过提高温度或增加日长来打破；它是突然中断的，因为一旦产卵开始，它就以最大的速度进行。在温带地区，滞育对迁徙策略有重要贡献。在热带地区可能也是如此。
Oncopeltus fasciatusexhibits a facultative reproductive diapause which is triggered by short photoperiods. The duration of the triggering photoperiod (the “critical photoperiod”) is a function of the environmental conditions under which populations are reared. Some individuals are apparently sensitive to critical photoperiods in the early instars, but maximum sensitivity, indicated by 100% diapause, occurs in the late 5th instar during development of the pharate adult. Sixty per cent retain sensitivity into the first five days of adulthood. Temperatures of 27°C can prevent diapause. Once initiated, diapause can be broken either by raising the temperature or increasing the day length; it is broken abruptly, for once oviposition starts, it proceeds at maximum rate. Diapause contributes significantly to a migratory strategy in the temperate parts of the range ofO. fasciatusand probably does so in the tropics as well.