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粘虫幼虫密度对成虫飞行与生殖的影响
引用本文:罗礼智,李光博.粘虫幼虫密度对成虫飞行与生殖的影响[J].昆虫学报,1995,38(1):38-45.
作者姓名:罗礼智  李光博
作者单位:中国农业科学院植物保护研究所
基金项目:国家自然科学基金,“八五”重点资助
摘    要:本文报道了不同幼虫密度下(1、10、20、30、40头/瓶-850m1)粘虫蛾飞行能力与产卵量的变化情况。对未取食1日龄成虫12h飞行能力的测定结果表明,不同幼虫密度羽化的成虫飞行力差异显著(P<0.05),其中以10头/瓶羽化的成虫飞行时间最长(平均225.4分),飞行距离最远(平均17.5km),飞行超过120min的个体为61.1%,超过10 km的为55%。其它处理的各项参数随幼虫密度的增加而下降。粘虫蛾的翅长、翅宽、翅面积和翅负荷随幼虫密度的增加而下降。除翊负荷外,其余各项参数在处理间的差异显著(P<0.05)。成虫飞行能力与蛹重或翅负荷不呈直线相关,但与蛹重具有一定的关系:当蛹重为300-400mg时, 强飞行个体均超过50%, 当小于300mg或大于400mg时,强飞行个体比例下降,当小于225mg时,强飞行个体为零。处理间的成虫产卵量差异显著(P<0.05),且随幼虫密度的增加而下降。密度内的蛹重与成虫产卵量的关系不明显,但密度间的蛹重与产卵量的关系高度相关(r=0.78,P<0.01)。这些结果表明,当粘虫幼虫密度达到一定的阈值时,便可能促使成虫迁飞,而不是等到种群密度很高时才进行迁飞。

关 键 词:粘虫  幼虫密度  飞行能力  产卵量  

THE INFLUENCE OF LARVAL REARING DENSITY ON FLIGHT CAPACITY AND FECUNDITY OF ADULT ORIENTAL ARMYWORM, MYTHMNA SEPSSATA (WALKER)
LUO LIZHI, LI GUANGBO, CAO YAZHONG, HU YI.THE INFLUENCE OF LARVAL REARING DENSITY ON FLIGHT CAPACITY AND FECUNDITY OF ADULT ORIENTAL ARMYWORM, MYTHMNA SEPSSATA (WALKER)[J].Acta Entomologica Sinica,1995,38(1):38-45.
Authors:LUO LIZHI  LI GUANGBO  CAO YAZHONG  HU YI
Institution:Institute of Plant Protection Chinese Academy of Agricultural Sciences Beijing 100094
Abstract:The flight capacity and fecundity of adult Mythimna seperata Walker as affected by larval rearing density under 5 regimes (1, 10, 20, 30 and 40 larvae/850 ml-jar) were investigated in the laboratory. The flight capacity, based on 12hour tethered-flight test of the unfed newly emerged moths from different larval rearing conditions, was the highest at a density of 10 larvae/jar, on the average of 225.4 minutes in duration and 17.5 kilometers in distance and significantly greater than those from other densities. Incidence of long-fliers in this rearing condition was also the highest whether based on flight distance or duration. In other rearing conditions, either flight capacity or proportion of long-fliers was decreased as larval density increased and vice versa, regardless of being significant or not. Neither pupal weight nor wing-loading was significantly correlated to the moth flight capacity or incidence of longfliers. However, there was a relationship between the long-fliers and pupal weight. Incidence of long-fliers exceeded 50% when pupal weight was in the range of 300-400 mg., but decreased beyond this range, and there was no longfliers when the pupal weight less than 225 mg. Fecundity was also significantly affected by and negatively related to larval density. Correlation between pupal weight and fecundity was insignificant within any given larval density but was significant when data from all densities are analysed together (r = 0.78, P < 0.01). Results obtained from this study suggest that larval density is one of the major environmental factors for Mythimna seperata migration, and migration begins when its population reach to certain density threshold in order to avoid its detrimental effect of further increase.
Keywords:Mythimna sepcrata Walker  larval density  flight capacity  fecundity migration  
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