Density and sex ra
*Amir Ansari pour1, Keyvan Aghasi2, Mostafa Bedoreh3
1- Agriculture faculty, Islamic Azad University, Khorramabad branch, Khorramabad, Iran. Email:Amir.email@example.com
2- Graduated student, Department of Entomology, Agriculture faculty, Islamic Azad University, Arak branch, Arak, Iran.
3- Agriculture faculty, Department of Plant protection, Ilam University, Ilam, Iran.
Abstract: Frequencies of seven spotted ladybird (C. septempunctata) were sampled from three altitudes of; 1700, 1800 and 1900 meters above sea level in the Rieg-sefid region of the Khorramabad district of Iran (33º48'N, 48º57'E, 1638m) in 2009 and 2010 during summer and autumn seasons. There was a higher frequency of females than males at all three altitudes (1700, 1800 and 1900 m) in both years. The average ratio of females to males in 2009 at an altitude of 1700 meters above sea level was 1.53:1; at the altitude of 1800 m it was 1.54:1 and at the altitude of 1900 m it was 1.55:1. The average ratio of females to males in 2010 at an altitude of 1700 meters above sea level was 1.49:1, at an altitude of 1800 m it was 1.51:1 and at an altitude of 1900 m it was 1.54:1. According to this information, results demonstrated that the ratio of females to males in seven spotted ladybird species increased at higher altitude. It was also observed that populations of this ladybird in farms at high altitude decreased and increased according to season.
[Amir Ansari pour, Keyvan Aghasi, Mostafa Bedoreh. Density and sex ratio of seven spotted ladybird (Coccinella septempunctata) in three altitudes of Khorramabad district. Life Sci J 2012;9(1):830-834] (ISSN:1097-8135).http://www.lifesciencesite.com. 120
Keywords: sex ratio, ladybird, Khorramabad, coccinella septempunctata Full Text 120