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首页> 外文期刊>Ecological research >Seasonal adaptations of the fall webworm Hyphantna cunea (Drury) (Lepidoptera: Arctiidae) following its invasion of Japan
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Seasonal adaptations of the fall webworm Hyphantna cunea (Drury) (Lepidoptera: Arctiidae) following its invasion of Japan

机译：秋季日本入侵的网虫Hyphantna cunea（Drury）（鳞翅目：Arctiidae）的季节性适应

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摘要

The fall webworm, Hyphuntria cunea (Drury) (Lepidoptera: Arctiidae), invaded Japan from North America about 60 years ago. Immediately after its invasion - and for the first three decades - its life cycle was bivoltine, two generations per year throughout its entire distribution in Japan. Thereafter, its life cycle shifted to trivoltine in the southwestern areas of Japan. In the present study we examined the life-history traits proposed to be implicated in this event with the aim of clarifying the mechanism of this life-cycle shift. The critical photoperiod for diapause induction, as defined by the photoperiod at which 50% of individuals enter diapause, was shorter in the trivoltine populations than in their bivoltine counterparts. The temperature sensitivity of the photoperiodic response, as defined by the difference in the critical photoperiod between 20 and 25℃, was greater in the trivoltine populations than in the bivoltine ones. The geographic variation in larval and pupal periods was positively correlated to the latitude of the original localities of the populations. The change in the number of larval instars would be one of the main factors accounting for the regional differences in the developmental period. These results suggest that some life-history traits of H. cunea have changed following its invasion of Japan as an adaptive response to local climates.
机译：大约60年前，秋天的网虫Hyphuntria cunea（Drury）（鳞翅目：Arctiidae）从北美入侵日本。入侵后-在最初的三十年中-生命周期为二伏特，在日本的整个发行过程中每年两次。此后，其生命周期在日本西南部转移到三伏特。在本研究中，我们研究了拟与该事件相关的生活史特征，目的是阐明这种生命周期转变的机制。在三伏族人群中，导致滞育的临界光周期（由50％的个体进入滞育的光周期定义）在三伏人群中要短于双伏人群。三周期人群中光周期响应的温度敏感性（临界温度在20至25℃之间的差异所定义）在三周期人群中要高于二周期人群。幼虫期和periods期的地理变化与人口原始所在地的纬度呈正相关。幼虫龄数的变化将是解释发育期区域差异的主要因素之一。这些结果表明，由于日本对当地气候的适应性反应，其在某些生活史特征上发生了变化。

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