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Muhammad Hamayoon Khan,Zeynep Yoldaş 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.4
The functional response of a predator describes the rate at which it kills its prey at different prey densities and is, therefore, an important tool to determine the efficiency of a predator in regulating the population dynamics of a prey. We investigated the functional response of Coccinella septempunctata L. (Coleoptera: Coccinellidae) to varying densities of Acyrthosiphon pisum (Harris) (Hemiptera: Aphididae). The results revealed that the linear coefficient, P 1 in the reduced logistic model was found significantly negative for the 4 th instar larvae and adult male and female of C. septempunctata (−0.002, −0.004 and − 0.002, respectively) indicating a type II functional response. The parameter estimates of adult male, female and 4 th instar larvae of C. septempunctata calculated through Holling's disc model revealed that the highest attack rate (a) (1.047 ± 0.014), shortest handling time (T h ) (0.0984 ± 0.024 h) and largest maximum capture rate (T/T h ) (243.902) was exhibited by female. Parameter estimates calculated through Rogers’s equation also showed the same sequence where maximum attack rate (a) of 0.00256 ± 0.0003 was exhibited by female followed by 4 th instar larvae (0.00251 ± 0.0005). The shortest handling time (T h ) (0.210 ± 0.003 h) and highest maximum capture rate (T/ T h ) (114.17) was also exhibited by female. Comparison of functional response curves of adult male, female and 4 th instar larvae revealed that maximum consumption of prey at all the densities offered was shown by female followed by 4 th instar larvae. The study manifested that C. septempunctata could be an efficient biocontrol agent of pea aphid, A. pisum.
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