Trans-regional migration of the beet armyworm, Spodoptera exigua (Lepidoptera: Noctuidae), in North-East Asia.
Trans-regional migration of the beet armyworm, Spodoptera exigua (Lepidoptera: Noctuidae), in North-East Asia.
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东北亚甜菜夜蛾（鳞翅目：夜蛾科）的跨区域迁徙
DOI：
10.1371/journal.pone.0183582
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发表时间：
2017
期刊：
影响因子：
3.7
通讯作者：
Wu K
中科院分区：
文献类型：
--
作者：
Fu X;Feng H;Liu Z;Wu K
甜菜夜蛾（Spodoptera exigua（Hübner））隶属于鳞翅目夜蛾科（Lessoptera：Noctuidae），是一种世界性的重要害虫。该物种被称为长距离迁徙者，以前对其迁徙的研究主要在其可以越冬的地区进行。然而，这种物种在不能越冬的地区（即，“夏季繁殖区”）仍然未知。在这里，我们通过探照灯捕获和卵巢解剖的方式，提供了位于中国北方渤海海峡中心的一个偏远小岛14年的监测数据。我们发现，这种海外迁徙的种群规模在不同年份之间变化很大，2005年，2007年，2009年和2014年的迁徙规模非常大，导致年总捕捞量超过1万只。此外，夜间渔获量表现出显着的月间变化，与绝大多数的S。8、9月份诱集甜菜夜蛾，诱集率为81.1 ± 3.6%;甜菜是这一时期最常见的物种之一。从最早捕获到最后捕获的平均时间为113 ± 22 d（范围57 d [2003]至138 d [2008]）。性别比例（女性：各月的男女比例均显著低于1：1，但6 ~ 10月女性比例呈上升趋势。夏季诱捕的雌虫大多数已交配（6月为94.4 ± 10.7%，7月为80.0 ± 6.4%）和性成熟（6月为88.9 ± 11.1%，7月为61.8 ± 12.3%），表明交配和/或性成熟的开始并不终止该物种的迁徙行为。这些发现为研究南太平洋的跨区域迁移提供了一个很好的起点。不同气候带的甜菜。
The beet armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), is a serious polyphagous insect pest worldwide. This species is known as a long-distance migrant, and previous studies on its migration have been mostly carried out in regions where it can overwinter. However, what pattern of seasonal migration this species exhibits in regions where it cannot overwinter (i.e., the ‘summer breeding region’) remains unknown. Here, we present data from 14-years of monitoring on a small remote island located in the center of the Bohai Strait, in northern China, by means of searchlight trapping and ovarian dissection. We found that the population size of this overseas migration varied significantly among years, with very large migrations in 2005, 2007, 2009, and 2014 that resulted in annual total catches of more than ten thousand individuals. In addition, nightly catches exhibited a significant inter-month variability, with the vast majority of S. exigua moths being trapped in August and September, (81.1 ± 3.6%), making S. exigua one of the most frequently encountered species in that period. The mean time from the earliest trap capture to the latest capture within a given year was 113 ± 22 d (range 57 d [2003] to 138 d [2008]). The sex ratio (females: males) was significantly less than 1:1 in each month, but the proportion of females showed an upward trend from June to October. The majority of trapped females in summer were mated (94.4 ± 10.7% in June, 80.0 ± 6.4% in July) and sexually mature (88.9 ± 11.1% in June, 61.8 ± 12.3% in July), suggesting the onset of mating and/or sexual maturation does not terminate the migration behavior in this species. These findings provide a good starting point for study of the trans-regional migration of S. exigua across different climate zones.
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