Overwintering biology and morphological characteristics of the migratory locust, Locusta migratoria after outbreaks on Iheya Island, Japan
Overwintering biology and morphological characteristics of the migratory locust, Locusta migratoria after outbreaks on Iheya Island, Japan
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DOI：
10.1303/aez.2009.165
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发表时间：
2009-02-01
影响因子：
1.3
通讯作者：
Tanaka, Seiji
中科院分区：
文献类型：
--
作者：
Yamagishi, Masaaki;Tanaka, Seiji
2005-2006年，日本冲绳岛Iheya岛发生了迁徙性蝗虫Locusta migratoria L.的暴发。本研究始于2006年秋季，目的是调查蝗灾发生后成虫的形态特征。虽然在野外收集到的大多数成虫表现出典型的独居形态特征，但少数成虫的特征是体色深、前凸、相对较小的F/C比和较大的E/F比，通常在暴发时记录到。2006年10月至2007年3月，每月对蝗虫进行取样，以确定其卵巢发育状况。样本中总有少数雌性有发育中的卵母细胞或卵，但大多数雌性直到1月才有小卵母细胞。秋季采集的雌蚊转移到实验室（12L12D和30℃）后开始产卵的平均时间为16 ~ 18天，但12月下旬以后采集的雌蚊产卵时间明显缩短。卵在20℃时有滞育能力，而在25℃和30℃时则没有。滞育的诱导受亲本光周期的影响。这些结果表明，该蝗虫主要在成虫期或卵期越冬。
Outbreaks of the migratory locust, Locusta migratoria L., occurred in 2005-2006 on Iheya Island, Okinawa, Japan. The present study was initiated in autumn 2006 to investigate the morphological characteristics of adult locusts after the outbreaks. Although most adults collected in the field showed morphometric traits typical of solitarious forms, a few adults were characterized by dark body coloration, a concave pronotum, relatively small F/C ratios and large E/F ratios, often recorded in outbreaks. Locusts were sampled every month from October 2006 to March 2007 to determine the status of ovarian development. A few females with developing oocytes or eggs were always present in the samples, but most females had small oocytes until January. The mean time required to start oviposition after transfer to the laboratory (12L12D and 30 degrees C) was 16-18 days in females collected in the autumn, but decreased significantly in those collected in late December onward. Eggs had a capacity for diapause at 20 degrees C, but not at 25 or 30 degrees C. The induction of diapause was influenced by the parental photoperiod. These results suggest that this locust overwinters mainly in the adult or egg stage on this island.