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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

Incidence of ovarian development (A) and mean proportion of sexually mature females (B) of A. segetum captured in the searchlight trap on BH during 2010–2013.The lines in B indicate average proportion of sexually mature females from 2010 to 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. Linear model (dotted lines): y = -0.1993x + 1.115; R2 = 0.9019.
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pone.0131639.g006: Incidence of ovarian development (A) and mean proportion of sexually mature females (B) of A. segetum captured in the searchlight trap on BH during 2010–2013.The lines in B indicate average proportion of sexually mature females from 2010 to 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. Linear model (dotted lines): y = -0.1993x + 1.115; R2 = 0.9019.

Mentions: The ovaries of captured females from May to September show different levels of development (Fig 6A). The proportion of sexually immature females with the ovaries at the development level 1 and 2 exhibited an upward trend from May to September during 2010–2013 (Fig 6A). In other words, the proportion of sexually mature females (ovarian development levels 3–5) showed an apparent downward trend from May to September (linear model, y = 0.1993x + 1.115; R2 = 0.9019, F = 27.59, P = 0.013) (Fig 6B). In May, most of A. segetum females showed a certain degree of ovarian development, at the levels 3–5, and the mean proportion of sexually mature females reached 84.02 ± 3.28%, which was significant (t = 8.02, df = 6, P = 0.004) higher than the mean proportion of sexually immature females. The mean proportions of sexually mature females in June and July reached 78.34 ± 7.43%, 63.58 ± 6.41%, respectively, which was not significantly different (June: t = 2.52, df = 6, P = 0.086; June: t = 2.08, df = 6, P = 0.130) from the mean proportion of sexually immature females. However, the proportion of sexually mature females declined rapidly and dropped to 18.28 ± 2.44%, 14.42 ± 3.90% in August and September, respectively, which was significantly (August: t = -10.91, df = 6, P = 0.002; September: t = -7.26, df = 6, P = 0.005) lower than the mean proportion of sexually immature (Fig 6B).


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)

Incidence of ovarian development (A) and mean proportion of sexually mature females (B) of A. segetum captured in the searchlight trap on BH during 2010–2013.The lines in B indicate average proportion of sexually mature females from 2010 to 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. Linear model (dotted lines): y = -0.1993x + 1.115; R2 = 0.9019.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0131639.g006: Incidence of ovarian development (A) and mean proportion of sexually mature females (B) of A. segetum captured in the searchlight trap on BH during 2010–2013.The lines in B indicate average proportion of sexually mature females from 2010 to 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. Linear model (dotted lines): y = -0.1993x + 1.115; R2 = 0.9019.
Mentions: The ovaries of captured females from May to September show different levels of development (Fig 6A). The proportion of sexually immature females with the ovaries at the development level 1 and 2 exhibited an upward trend from May to September during 2010–2013 (Fig 6A). In other words, the proportion of sexually mature females (ovarian development levels 3–5) showed an apparent downward trend from May to September (linear model, y = 0.1993x + 1.115; R2 = 0.9019, F = 27.59, P = 0.013) (Fig 6B). In May, most of A. segetum females showed a certain degree of ovarian development, at the levels 3–5, and the mean proportion of sexually mature females reached 84.02 ± 3.28%, which was significant (t = 8.02, df = 6, P = 0.004) higher than the mean proportion of sexually immature females. The mean proportions of sexually mature females in June and July reached 78.34 ± 7.43%, 63.58 ± 6.41%, respectively, which was not significantly different (June: t = 2.52, df = 6, P = 0.086; June: t = 2.08, df = 6, P = 0.130) from the mean proportion of sexually immature females. However, the proportion of sexually mature females declined rapidly and dropped to 18.28 ± 2.44%, 14.42 ± 3.90% in August and September, respectively, which was significantly (August: t = -10.91, df = 6, P = 0.002; September: t = -7.26, df = 6, P = 0.005) lower than the mean proportion of sexually immature (Fig 6B).

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