三种木蠹蛾越冬幼虫的过冷却能力差异比较

Comparison of the supercooling capacity in three species of Cossidae overwintering larvae

以宁夏地区3种木蠹蛾越冬幼虫(榆木蠹蛾、沙蒿木蠹蛾和沙棘木蠹蛾)为研究对象,分析了3种木蠹蛾越冬幼虫在不同时期的过冷却点和结冰点,同时比较了沙棘木蠹蛾不同虫龄阶段的过冷却点和结冰点。结果表明,3种木蠹蛾的过冷却能力基本相似,沙蒿木蠹蛾在3种木蠹蛾中对低温环境的适应能力较强。低温驯化对木蠹蛾越冬幼虫的过冷却能力影响明显,榆木蠹蛾和沙蒿木蠹蛾2013年3月的过冷却点及结冰点显著高于2014年1月,两种木蠹蛾表现出耐结冰型昆虫的特征。沙棘木蠹蛾各虫龄阶段之间的过冷却能力差异不显著,但高龄越冬幼虫具有更好的适应温度变化的能力。

The supercooling points（SCPs）and freezing points（FPs）of the overwintering larvae of three species of Cossidae（Deserticossus tsingtauana,D.artemisiae and Eogystia hippophaecolus）were analyzed in different time points in Ningxia Hui Autonomous Regions,and the SCPs and FPs of E.hippophaecolus in different instars were also detected.The results showed that the supercooling capacity of the three Cossidae larvae were basically the same.D.artemisiae had the best adaptation to low temperature.Cold acclimation had a significant effect on the supercooling capacity;the SCPs and FPs of D.tsingtauana and D.artemisiae in March2013 were higher than those in January 2014,and both Cossidae species showed the characteristics of＂freezing-tolerance＂.No difference in supercooling capacity were found among the three instars of E.hippophaecolus,but the older larvae showed better adaptation to temperature variation.