Tracking dragons: stable isotopes reveal the annual cycle of a long-distance migratory insect
Tracking dragons: stable isotopes reveal the annual cycle of a long-distance migratory insect
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DOI：
10.1098/rsbl.2018.0741
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发表时间：
2018-12-01
期刊：
影响因子：
3.3
通讯作者：
Studds, Colin E.
中科院分区：
文献类型：
--
作者：
Hallworth, Michael T.;Marra, Peter P.;Studds, Colin E.
昆虫迁徙在全球范围内普遍存在，可能涉及大陆规模的运动和复杂的生活史。除了一些迁徙的飞蛾和蝴蝶，人们对迁徙昆虫的年周期结构知之甚少。使用稳定氢同位素分析的852翼样本从8个国家跨越140年，结合21年的公民科学数据，我们确定了一个大的迁徙鸟类，常见的绿色darner（Anax junius）的完整的年周期。我们证明，darners进行复杂的长距离的年度迁移主要是由温度，涉及至少三代。春季，第一代从南部到北方范围界限进行长距离北行（超过650公里），产卵并死亡。第二代出现并返回南方（超过680公里），在那里产卵并死亡。最后，第三代居民出现，在当地繁殖，并在次年春天向北迁移。由于迁徙时间和若虫发育高度依赖于温度，持续的气候变化可能导致这种和类似迁徙昆虫的生物学发生根本性变化。
Insect migration is globally ubiquitous and can involve continental-scale movements and complex life histories. Apart from select species of migratory moths and butterflies, little is known about the structure of the annual cycle for migratory insects. Using stable-hydrogen isotope analysis of 852 wing samples from eight countries spanning 140 years, combined with 21 years of citizen science data, we determined the full annual cycle of a large migratory dragonfly, the common green darner (Anax junius). We demonstrate that darners undertake complex long-distance annual migrations governed largely by temperature that involve at least three generations. In spring, the first generation makes a long-distance northbound movement (further than 650 km) from southern to northern range limits, lays eggs and dies. A second generation emerges and returns south (further than 680 km), where they lay eggs and die. Finally, a third resident generation emerges, reproducing locally and giving rise to the cohort that migrates north the following spring. Since migration timing and nymph development are highly dependent on temperature, continued climate change could lead to fundamental changes in the biology for this and similar migratory insects.