Continuous observations of larvae of the silkworm, Bombyx mori, revealed that feeding occurred at regular intervals throughout larval development. To investigate possible factors influencing meal-timing, the behaviours of diet-deprived Bombyx larvae were also analysed. Diet-deprivation resulted in longer durations of the first meals after diet replacement, but did not affect feeding patterns. Furthermore, long-term diet-deprivation promoted wandering behaviour and a consequent delay in feeding after diet replacement. Under diet-deprivation conditions, meal-starts appeared to be inducible by defecation and physical stimulation. However, stimulation-induced meal-starts were dependent on the time elapsed since the larvae's previous meals. Provided that more than 1h had elapsed since their previous meals, larvae could be induced to feed by defecation and tapping. At less than 1h post-meal, larvae were less likely to begin feeding after defecation or physical stimulation. Activated locomotions such as wandering and feeding were observed in the long-term diet-deprived larvae only after diet blocks were replaced, while long-term diet-deprived larvae did not show activated locomotion during the absence of diet blocks. Collectively, these data suggest that a combination of elevated locomotion activity and the presence of diet may be necessary for the initiation of feeding in diet-deprived larvae.

译文

:对蚕Bombyx mori幼虫的连续观察表明,在整个幼虫发育过程中,定期喂食。为了调查可能影响进餐时间的因素,还分析了饮食缺乏的家蚕幼虫的行为。饮食剥夺导致饮食替代后第一顿饭的时间更长,但不影响喂养方式。此外,长期的饮食剥夺促进了流浪行为,并因此在替代饮食后导致进食延迟。在缺乏饮食的情况下,排便和身体刺激似乎可以诱导进餐。然而,刺激引起的进餐开始取决于幼虫上一次进餐以来经过的时间。如果自从他们进餐以来已经超过1小时,则可以通过排便和敲打来诱使幼虫进食。餐后不到1小时,排便或身体刺激后,幼虫就不太可能开始进食。仅在更换饮食块后,长期饮食剥夺的幼虫才观察到激活的运动,如游荡和进食,而在缺乏饮食块的情况下,长期饮食剥夺的幼虫未表现出激活的运动。总体而言,这些数据表明,开始饮食剥夺的幼虫开始进食可能需要结合运动活动和饮食的存在。

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