- All Journals
- Al-Qadisiyah University
- Basrah University
- Kirkuk University
- Mosul University
- The Iraqi Borad for Medical Specialization
- University of Anbar
- University of Technology
- Al Mustafa University
- Al-Zahraa University for Women
- Alnoor University
- Kunooz University
- Misan University
- Ninevah University
- Tikrit University
- University of Al-Hamdaniya
- University of Kerbala
Functional response of male and female Coccinella undecimpunctata L. (Coccinelliadae : Coccinellidae) to different densities of different nymphal instars of Aphis fabae (Homptera : Aphididae). | ||
| journal of al-qadisiyah for pure science(quarterly) | ||
| Article 1, Volume 12, Issue 1, 2012, Pages 121-127 PDF (0 K) | ||
| Author | ||
| Saadi Mohamed hilal | ||
| Abstract | ||
| The functional response parameters and patterns of male and female Coccinellid Coccinella undecimpunctata L. were evaluated to find out how this predator respond at four different prey nymphal instars across various prey densities levels . Both male and female predator exhibited a decelerating curve Type П responses at all different nymphal instars of the prey . The calculated values of coefficient of attack rates of predators females were much higher than those of male predator at all different nymphal instars of the prey .The calculated values of coefficient of attack for female predator at 1st , 2nd , 3rd and 4th nymphal aphid instars were 1.2 , 1.18 , 0,64 and 0.5 consequently as compared with 0.65 , 0.54 , 0.33 and 0.23 for males . However , the calculated values of handling times of male predator was longer that of female ones at different nymphal instars of the prey , thus , the handling time of male predator at 1st , 2nd , 3rd and 4th nymphal aphid instars were 4.2 , 5.6 , 5.8 and 6.3 min. respectively as compared with 2.3 , 3.6 , 3.9 and 4.5 min. respectively for female predator . | ||
|
Statistics Article View: 51 PDF Download: 34 |
||