作　　者： ; ; ; ; ; (李敏）;

机构地区： 山东农业大学植物保护学院

出　　处： 《昆虫学报》 2008年第12期1271-1278,共8页

摘　　要： 为研究异色瓢虫Harmonia axyridis自然种群耐寒能力的季节性变化,测定了其过冷却点、体内含水量及总脂肪含量和低温存活力。结果表明:异色瓢虫成虫低温存活力呈现出明显的季节性变化,越冬前成虫的耐寒性显著强于夏季成虫和越冬后成虫。冷驯化(5℃,5d)可以显著提高夏季成虫的低温存活力。雌雄成虫过冷却点和体内含水量随气温的降低而降低,升高而升高。过冷却点7月份最高,分别为-7.6℃和-8.0℃;越冬中期(2008-01-15)最低,分别为-18.1℃和-16.9℃。雌雄成虫体内含水量9月份最高,分别为66.87%和68.01%,10月份显著降低,越冬后期(2008-2-19)最低,分别为52.94%和51.53%。越冬期间过冷却点和体内含水量显著低于其他时期。而雌雄成虫体内总脂肪含量在越冬开始就达到最高,分别为50.07%和47.93%,随后又逐渐降低,越冬期间显著高于其他时期。由此可知异色瓢虫自然种群的耐寒性呈现出明显的季节性变化,文中还就异色瓢虫自然种群耐寒性影响因素及其越冬策略进行了讨论。 In this study, seasonal variation in cold tolerance of Harmonia axyridis adults were investigated by measuring their supercooling point （SCP）, water content, total fat content and cold survival ability. The results indicated that cold tolerance of the adults varied obviously with seasons. The pre-winter adults had higher tolerance to low temperature than the summer and post-winter adults. Summer adults with cold acclimation （5 ℃, 5 d） before the occurrence of low temperatures showed higher cold tolerance. The SCPs and the water and fat content of the female and male adults varied remarkably in different seasons. The SCPs of female and male adults were highest in July （ - 7.6℃ and - 8.0 ℃, respectively） while lowest in January （- 18.1℃ and - 16.9℃, respectively）; the water contents of female and male adults were highest in September （66.87% and 68.01%, respectively） while lowest in February （52.94% and 51.53%, respectively）. The SCP and water content of over-wintering adults were significantly lower than those in other seasons. But the total fat contents of pre-winter female and male adults （50.07 % and 47.93 %, respectively） were significantly higher than those in other seasons.

关 键 词： 异色瓢虫 耐寒性 冷驯化 过冷却点 含水量 总脂肪含量

领　　域： [生物学]