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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.


Related in: MedlinePlus

Nightly catches (A) and mean logarithm of numbers in the 11 years (B) of A. segetum in the searchlight trap on BH from April to October.
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pone.0131639.g003: Nightly catches (A) and mean logarithm of numbers in the 11 years (B) of A. segetum in the searchlight trap on BH from April to October.

Mentions: Besides the annual fluctuations in the number of A. segetum moths, we also observed considerable variation in months from May to September. Light trapping indicated that there were three noticeable peak periods of migration over the sea, namely, in late-May, early- and late-July, mid-September to early-October (Fig 3). There were no catches in late-October (Fig 3). There was significant inter-month difference (F = 4.46, df1 = 6, df2 = 63, P = 0.001) in the nightly mean catches of A. segetum in the 11 years (Fig 3).


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)

Nightly catches (A) and mean logarithm of numbers in the 11 years (B) of A. segetum in the searchlight trap on BH from April to October.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0131639.g003: Nightly catches (A) and mean logarithm of numbers in the 11 years (B) of A. segetum in the searchlight trap on BH from April to October.
Mentions: Besides the annual fluctuations in the number of A. segetum moths, we also observed considerable variation in months from May to September. Light trapping indicated that there were three noticeable peak periods of migration over the sea, namely, in late-May, early- and late-July, mid-September to early-October (Fig 3). There were no catches in late-October (Fig 3). There was significant inter-month difference (F = 4.46, df1 = 6, df2 = 63, P = 0.001) in the nightly mean catches of A. segetum in the 11 years (Fig 3).

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