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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 mating occurrences of A. segetum females captured in the searchlight trap on BH during 2010–2013.
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pone.0131639.g005: Proportion of mating occurrences of A. segetum females captured in the searchlight trap on BH during 2010–2013.

Mentions: The proportions of mated females with respect to all dissected females, however, varied considerably between months (F = 57.51, df1 = 4, df2 = 15, P < 0.001) (Fig 4C and 4D). The proportion of mated females in May and June reached 87.11 ± 1.37%, 81.38 ± 4.79%, respectively, which were significantly (May: t = 20.49, df = 6, P < 0.001; June: t = 5.15, df = 6, P = 0.014) higher than the mean proportion of unmated individuals (Fig 4C and 4D). The proportion of mated females in July was 62.72 ± 6.33% and was not significantly different (t = 1.95, df = 6, P = 0.15) from the mean proportion of unmated individuals. In August and September, however, the proportion of mated females declined rapidly and dropped to 22.28 ± 4.33%, 9.52 ± 2.30%, respectively, which was significantly (August: t = -5.96, df = 6, P = 0.009; September: t = -12.42, df = 6, P = 0.001) lower than the mean proportion of unmated individuals (Fig 4C). Thus, the proportion of mated females has a significant falling trend from May to September during the 11 years (linear model, y = -0.2143x + 1.1689; R2 = 0.9377, F = 45.13, P = 0.007) (Fig 4D). Among the mated females, the vast majority just mated once, some mated twice, and only a few mated three and four times in the first three months (May, June, and July). Most of mated females mated once in August and September (Fig 5).


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 mating occurrences of A. segetum females captured in the searchlight trap on BH during 2010–2013.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0131639.g005: Proportion of mating occurrences of A. segetum females captured in the searchlight trap on BH during 2010–2013.
Mentions: The proportions of mated females with respect to all dissected females, however, varied considerably between months (F = 57.51, df1 = 4, df2 = 15, P < 0.001) (Fig 4C and 4D). The proportion of mated females in May and June reached 87.11 ± 1.37%, 81.38 ± 4.79%, respectively, which were significantly (May: t = 20.49, df = 6, P < 0.001; June: t = 5.15, df = 6, P = 0.014) higher than the mean proportion of unmated individuals (Fig 4C and 4D). The proportion of mated females in July was 62.72 ± 6.33% and was not significantly different (t = 1.95, df = 6, P = 0.15) from the mean proportion of unmated individuals. In August and September, however, the proportion of mated females declined rapidly and dropped to 22.28 ± 4.33%, 9.52 ± 2.30%, respectively, which was significantly (August: t = -5.96, df = 6, P = 0.009; September: t = -12.42, df = 6, P = 0.001) lower than the mean proportion of unmated individuals (Fig 4C). Thus, the proportion of mated females has a significant falling trend from May to September during the 11 years (linear model, y = -0.2143x + 1.1689; R2 = 0.9377, F = 45.13, P = 0.007) (Fig 4D). Among the mated females, the vast majority just mated once, some mated twice, and only a few mated three and four times in the first three months (May, June, and July). Most of mated females mated once in August and September (Fig 5).

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