摘要
研究结果表明:小地老虎在我国北方不能越冬,1月份0℃等温线为其越冬界线,10℃等温线以南为北方非越冬区春季小地老虎的虫源基地。其自然种群标记回收获得了小地老虎远距离迁飞的直接证据,基本明确了它迁飞的路线、距离与节律。迁飞活动与天气条件关系密切,以群体方式进行迁飞,其方向受气流控制。飞翔临界低温(6℃)和飞行适温下限(10℃),可用于判断迁飞空间的边界与迁飞的主流位置,也是春季迁入区始见蛾与始盛期的温度指标。前翅长宽比值超过3,脂肪储备丰富(约占干体重的30％),强大的飞行肌与其独特结构,以及飞翔时体温升高5—9℃,均为其远距离迁飞提供了形态、物质等基础。
It was found that the black cutworm Agrotis ypsilon (Rottemberg)can not overwinter in northern China,the spring source base of thisinsect for this area is far from the south of 10℃ January isotherm,andits overwintering boundary line is at 0℃ January isotherm. A large number of tagging-recapturing experiments had directlyconfirmed the hypothesis that the black cutworm possesses an ability forlong distance migration.The migration routes,distance and rhythmwere basically clarified.There was close correlation between the migra-tion of black cutworm and weather conditions,and the migration di-rection was controlled by air flow.The critical low temperature andlower limit of optimum temperature for flight were 6℃ and 10℃,re-spectively;these criteria could be used for determining the boundary ofmigration space and location of main migration flow,and as the tem-perature indices of the begin and beginpeak stage of moth occurrence inimmigration area. The≥3 length-width ratio of forewing,plentiful fat storage(about 30% of dry body weight),strong flight muscle and its uniquestructure,and that the body temperature increased by 5—9℃ duringflight,all these facts had provided the morphological and physical ba-ses for long distance migration.
出处
《植物保护学报》
CAS
CSCD
北大核心
1990年第4期337-342,共6页
Journal of Plant Protection
关键词
小地老虎
越冬
迁飞
black cutworm——overwintering——migration
