摘要
系统比较了田间粘虫Mythimnaseparata (Walker)迁出与迁入种群在飞行能力、飞行肌干重、卵巢发育、交配以及保幼激素滴度等指标的差异。结果显示 ,迁出种群的飞行潜力显著强于迁入种群 ,雌蛾中胸背纵肌平均干重 (6 5 3mg)也显著高于迁入种群 (5 92mg) ,但卵巢发育程度显著低于迁入种群 ;迁出种群的交配率和平均交配次数均显著低于迁入种群 ;早期迁入的雌蛾卵巢发育级别和交配率相对较低 ,并随迁入时间的延长而增加。迁出与迁入种群雌蛾的保幼激素滴度也存在显著差异 ,两者的JHⅡ滴度平均分别为 4 6 3ng mg和 8 6 9ng mg。这些结果说明 ,粘虫迁飞前后的行为、生理和生殖特性具有明显的变化 ,迁出种群具有较强的飞行潜力 ,生殖系统的发育受到暂时性抑制 ;而迁入种群飞行能力下降 ,卵巢发育级别较高 ,交配率增加。同一世代早期迁入的雌蛾卵巢发育程度较低 ,表明粘虫迁飞是发生在成虫发育的初期 ,迁飞过程中卵巢发育受到暂时性抑制 ,迁入以后便迅速发育并开始繁殖。粘虫迁飞的行为和生理特性与“卵子发生 飞行拮抗综合症候 (oogenesisi flightsyndrome)”相符。内分泌激素 (保幼激素 )在其迁飞与生殖的转换过程中起着重要的调控作用。
Behavioral and physiological characteristics of the emigrant and immigrant populations of the oriental armyworm, Mythimna separata (Walker) moths trapped in field in Ganyu County, Jiangsu Province and Shenyang suburb, Liaoning Province were examined. The results indicated that moths of the emigrant population exhibited stronger flight potential than that of the immigrant population. The flight distance, total flight duration and average flight speed in the emigrant population were 13.6 km, 153.1 min and 5.1 km/h, while in the immigrant population were 6.0 km, 64.3 min and 4.9 km/h, respectively. All of the flight potential variables except flight speed in the immigrant population were significantly less than those in the emigrant population. Dry weight of the thoracic dorsal-longitudinal muscle in female in the emigrant population was 6.53 mg, significantly higher than the value of 5.92 mg in the immigrant population. Most females in the emigrant population exhibited little or no ovarian development and were seldom mated, and mean basal ovariole width, length, wet weight, mating rate and frequency were 0.21 mm, 4.01 cm, 16.34 mg, 27.5% and 0.32 respectively, which were significantly lower than those of 0.51 mm, 5.43 cm, 56.7 mg, 98% and 1.44 in the immigrant population. In addition, the ovarian development and mating rate in the immigrant females early trapped were lower than those later trapped and increased as trapping time prolonged. Juvenile hormone titer (JHⅡ) in the emigrant population was 4.63ng/mg, also significantly lower than that of 8.69 in the immigrant population. Comparison of all of these variables between the emigrant and immigrant populations suggests that there are obvious trade-off between flight and reproduction. The migrants have strong flight potential, and reproduction activities are depressed before migration, while mating and oviposition begin rapidly after they arrive at new habitats. This model fits the “oogenesis-flight syndrome' hypothesis well. The juvenile hormone plays a significant role in the trade-off process between flight and reproduction in the female.
出处
《昆虫学报》
CAS
CSCD
北大核心
2005年第1期61-67,共7页
Acta Entomologica Sinica
基金
国家"973"项目 (G2 0 0 0 0 162 0 6)
关键词
粘虫
迁入种群
迁出种群
卵子发生-飞行拮抗综合症候
保幼激素滴度
Mythimna separata
emigrant population
immigrant population
oogenesis-flight syndrome
juvenile hormone titer
