飞蝗越冬卵过冷却点的季节性变化及生态学意义

运用热电偶方法测定了飞蝗LocustamigratoriaL .越冬卵过冷却点月份间的变化。结果表明 :飞蝗卵的过冷却点值波动较大 ,主要形成 2部分 ,一部分分布在 -2 5℃左右 ,另一部分分布在 -1 0℃左右 ,同时 ,这两部分的比例随着季节性气温的变化有明显的差异 ,气温较低的月份 ,-2 5℃左右的比例增加 ,而且最小过冷却点的值也更低 ;反之 ,-1 0℃左右的比例增加 ,过冷却点最高值也升高。这种现象说明了飞蝗卵对冬季低温的一种生态适应。

Seasonal changes in the supercooling point of overwintering eggs of Locusta migratoria

The supercooling points (SCP) of overwintering eggs of the migratory locust were measured monthly with a thermocouple. The results show that the distribution of egg SCP values mainly formed two peaks, one around -25℃, and the other around -10℃. The SCP prorate between the two peaks differed markedly with seasonal changes in climate. In mid-winter, SCP values were about -25℃, and the minimum value also reached its minimum, in contrast they were about -10℃ in spring and summer,and the maximum value become higher. This phenomenon to some extent explains the ability of the migratory locust to withstand low temperature.