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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

Proportion of females (A-B) and proportion of mated females (C-D) of A. segetum captured in the searchlight trap on BH during 2010–2013.The histograms in A and C indicate mean daily proportion in each month, and the error bars represent standard errors between days in that month. The histograms in B and the lines in D indicate mean proportion of females and mated females from 2010–2013 in each month, and the error bars represent standard errors between years in that month. Bars sharing the same letter indicate that there were no significant inter-month differences at the 5% level by Tukey's HSD tests. Few moths were trapped in April and October, so these months are not presented and the same below. Linear model (dotted lines): y = -0.2143 x + 1.1689; R2 = 0.9377.
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pone.0131639.g004: Proportion of females (A-B) and proportion of mated females (C-D) of A. segetum captured in the searchlight trap on BH during 2010–2013.The histograms in A and C indicate mean daily proportion in each month, and the error bars represent standard errors between days in that month. The histograms in B and the lines in D indicate mean proportion of females and mated females from 2010–2013 in each month, and the error bars represent standard errors between years in that month. Bars sharing the same letter indicate that there were no significant inter-month differences at the 5% level by Tukey's HSD tests. Few moths were trapped in April and October, so these months are not presented and the same below. Linear model (dotted lines): y = -0.2143 x + 1.1689; R2 = 0.9377.

Mentions: From May to September 2010–2013, the vast majority of trapped A. segetum were females and chi-square tests showed that the sex ratio (females: males, monthly sum of catches) was significantly higher than 1:1 in all months: May, χ2 = 25.24, df = 1, P < 0.001; June, χ2 = 15.13, df = 1, P < 0.001; July, χ2 = 187.14, df = 1, P < 0.001; August, χ2 = 58.59, df = 1, P < 0.001; September, χ2 = 57.07, df = 1, P < 0.001. However, there was no significant inter-month difference (F = 0.07, df1 = 4, df2 = 15, P = 0.99) in the mean proportion of females from 2010–2013 (Fig 4A and 4B).


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)

Proportion of females (A-B) and proportion of mated females (C-D) of A. segetum captured in the searchlight trap on BH during 2010–2013.The histograms in A and C indicate mean daily proportion in each month, and the error bars represent standard errors between days in that month. The histograms in B and the lines in D indicate mean proportion of females and mated females from 2010–2013 in each month, and the error bars represent standard errors between years in that month. Bars sharing the same letter indicate that there were no significant inter-month differences at the 5% level by Tukey's HSD tests. Few moths were trapped in April and October, so these months are not presented and the same below. Linear model (dotted lines): y = -0.2143 x + 1.1689; R2 = 0.9377.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0131639.g004: Proportion of females (A-B) and proportion of mated females (C-D) of A. segetum captured in the searchlight trap on BH during 2010–2013.The histograms in A and C indicate mean daily proportion in each month, and the error bars represent standard errors between days in that month. The histograms in B and the lines in D indicate mean proportion of females and mated females from 2010–2013 in each month, and the error bars represent standard errors between years in that month. Bars sharing the same letter indicate that there were no significant inter-month differences at the 5% level by Tukey's HSD tests. Few moths were trapped in April and October, so these months are not presented and the same below. Linear model (dotted lines): y = -0.2143 x + 1.1689; R2 = 0.9377.
Mentions: From May to September 2010–2013, the vast majority of trapped A. segetum were females and chi-square tests showed that the sex ratio (females: males, monthly sum of catches) was significantly higher than 1:1 in all months: May, χ2 = 25.24, df = 1, P < 0.001; June, χ2 = 15.13, df = 1, P < 0.001; July, χ2 = 187.14, df = 1, P < 0.001; August, χ2 = 58.59, df = 1, P < 0.001; September, χ2 = 57.07, df = 1, P < 0.001. However, there was no significant inter-month difference (F = 0.07, df1 = 4, df2 = 15, P = 0.99) in the mean proportion of females from 2010–2013 (Fig 4A and 4B).

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