摘要
5南美斑潜蝇是我国重要入侵种 ,已在我国广泛分布。为了解其不同地理种群的冷适应能力 ,2 0 0 2年5月底至 7月初在其分布区从南到北每隔大约 5° (纬度 )安排 1个采样点 ,包括昆明、成都、西安、北京和赤峰 ,采集这些地理种群蛹和幼虫 ;在室内实验测定蛹的过冷却点 (SCP)。蛹的SCP随纬度升高显著增加 ,最大相差 3 7℃ ;5个地理种群的SCP与当地气温年较差呈显著负相关 ,但与年均温无关。上述结果说明 ,南美斑潜蝇向北扩散过程包含了包括SCP逐步降低的适应机制。
The pea leafminer Liriomyza huidobrensis is an invasive species,which has widely distributed in China.To specify its adaptation to cold (stress),we sampled pupae and larvae of the species from Kunming,Chengdu,Xian,Beijing and Chifeng,stepping up about every 5° from south to north.Supercooling points (SCP) of pupae were experimentally tested.The SCP increased with latitude,and the difference between populations at the two extremes was 3.7?℃,and the SCP was negatively related to the yearly margin of ambient temperature for the geographical populations,but not to the monthly or yearly temperatures they experienced.The results imply that an adaptive course of lowing SCP involves in the species dispersing northwards.
基金
国家重点基础研究发展规划项目 (G2 0 0 0 0 4680 3 )
关键词
南美斑潜蝇
过冷却
地理种群
种群扩散
Liriomyza huidobrensis
Supercooling
Geographical population
Population dispersion
