温度对2个地理种群莲草直胸跳甲成虫产卵量及存活率的影响

【背景】温度对莲草直胸跳甲种群增长具有重要作用，了解引进的莲草直胸跳甲泰国种群的温度适应性，同时与福州本地种群相比较，可以有效地利用其防治空心莲子草。【方法】采用室内继代饲养的方法，设置3个温度，对莲草直胸跳甲福州本地种群和泰国热带种群的成虫产卵量及存活率进行了研究。【结果】在相同温度条件下，泰国热带种群的繁殖力显著高于福州本地种群。随着温度的升高，泰国热带种群和福州本地种群的产卵量均有显著下降，但泰国热带种群的产卵量均稍高于福州本地种群。在3个试验温度下，莲草直胸跳甲泰国热带种群的成虫寿命较福州本地种群的寿命长。【结论与意义】莲草直胸跳甲泰国热带种群对温度的适应性和繁殖力强，更容易构建种群，有利于对空心莲子草的生物防治。

Effects of temperature on the fecundity and survival of Agasicles hygrophila from two geographic populations

【Background】 Agasicles hygrophila was introduced to control Alternanthera philoxeroides. This paper studied two geographically distinct populations of Agasicles hygrophila to examine their differential adaptive responses to temperature. 【Method】The fecundity and survival of Agasicles hygrophila of a Thailand population and a Fuzhou, China, population were exposed to three different temperatures by continuously rearing over a period of three generations. 【Result】The study showed that the reproductive rate of the Thailand population was faster than the Chinese population of Fuzhou when exposed at the same temperature. With temperatures increasing, the fecundity of the two geographic populations both decreased significantly, but the oviposition amount of Thailand tropical population was more than Fuzhou local population. At the same time Agasicles hygrophilaof Thailand tropical population had longer lifetime than Fuzhou local population at the test temperature. 【Conclusion and significance】 The reproductive capacity of Thailand tropical Agasicles hygrophila, with stronger adaptation to temperature, is better than Fuzhou local population. It can establish populations more rapidly in the summer and can be beneficial to control of Alternanthera philoxeroides.