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Annual Migration of Agrotis segetum (Lepidoptera: Noctuidae): Observed on a Small Isolated Island in Northern China.

Guo J, Fu X, Wu X, Zhao X, Wu K - PLoS ONE (2015)

Bottom Line: The early summer populations migrate in a south-north direction, which might undertake a long-distance flight on several successive nights.The autumn populations migrate in a north-south direction, which might originate not far from the trapping site.Based on these findings, the migratory physiology of A. segetum was discussed.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China; Department of Entomology, College of Plant Protection, Henan Agricultural University, Zhengzhou, China.

ABSTRACT
Migration behavior of the turnip moth, Agrotis segetum (Lepidoptera: Noctuidae), is not well known by far. Here, we present the data from an 11-year study on A. segetum by means of searchlight trapping and ovarian dissection on Beihuang (BH) Island, which located in the center of the Bohai Strait in northern China. The data showed a large number of A. segetum flight across the strait each year, which provides direct evidence that A. segetum is a long-distance migrant, migrating at least 40-60 km to reach the trapping site. The migration period during 2003-2013 ranged from 115 to 172 d. Among the catches, the proportion of females was significantly higher than that of males in each month from May to September. Ovarian dissection showed that the proportion of mated females and the proportion of sexually mature females was significantly higher than that of unmated females and sexually immature females in early summer, respectively, but conversely in autumn. The early summer populations migrate in a south-north direction, which might undertake a long-distance flight on several successive nights. The autumn populations migrate in a north-south direction, which might originate not far from the trapping site. Based on these findings, the migratory physiology of A. segetum was discussed.

No MeSH data available.


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Annual catches of A. segetum in the searchlight trap on BH from 2003 to 2013.
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pone.0131639.g002: Annual catches of A. segetum in the searchlight trap on BH from 2003 to 2013.

Mentions: During the study period of 2003–2013, no A. segetum larvae were found on BH. However A. segetum adults were regularly captured in the searchlight trap, strongly suggesting that A. segetum moths immigrate from the mainland rather than emerging locally. They migrated at least 40 to 60 km to reach the trapping site across the sea. The total number of captured A. segetum individuals during the 11-year period was 16875, and for each year the number ranged from 494 to 3660, except for 27 individuals in 2003 (Fig 2).


Annual Migration of Agrotis segetum (Lepidoptera: Noctuidae): Observed on a Small Isolated Island in Northern China.

Guo J, Fu X, Wu X, Zhao X, Wu K - PLoS ONE (2015)

Annual catches of A. segetum in the searchlight trap on BH from 2003 to 2013.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4482664&req=5

pone.0131639.g002: Annual catches of A. segetum in the searchlight trap on BH from 2003 to 2013.
Mentions: During the study period of 2003–2013, no A. segetum larvae were found on BH. However A. segetum adults were regularly captured in the searchlight trap, strongly suggesting that A. segetum moths immigrate from the mainland rather than emerging locally. They migrated at least 40 to 60 km to reach the trapping site across the sea. The total number of captured A. segetum individuals during the 11-year period was 16875, and for each year the number ranged from 494 to 3660, except for 27 individuals in 2003 (Fig 2).

Bottom Line: The early summer populations migrate in a south-north direction, which might undertake a long-distance flight on several successive nights.The autumn populations migrate in a north-south direction, which might originate not far from the trapping site.Based on these findings, the migratory physiology of A. segetum was discussed.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China; Department of Entomology, College of Plant Protection, Henan Agricultural University, Zhengzhou, China.

ABSTRACT
Migration behavior of the turnip moth, Agrotis segetum (Lepidoptera: Noctuidae), is not well known by far. Here, we present the data from an 11-year study on A. segetum by means of searchlight trapping and ovarian dissection on Beihuang (BH) Island, which located in the center of the Bohai Strait in northern China. The data showed a large number of A. segetum flight across the strait each year, which provides direct evidence that A. segetum is a long-distance migrant, migrating at least 40-60 km to reach the trapping site. The migration period during 2003-2013 ranged from 115 to 172 d. Among the catches, the proportion of females was significantly higher than that of males in each month from May to September. Ovarian dissection showed that the proportion of mated females and the proportion of sexually mature females was significantly higher than that of unmated females and sexually immature females in early summer, respectively, but conversely in autumn. The early summer populations migrate in a south-north direction, which might undertake a long-distance flight on several successive nights. The autumn populations migrate in a north-south direction, which might originate not far from the trapping site. Based on these findings, the migratory physiology of A. segetum was discussed.

No MeSH data available.


Related in: MedlinePlus