Further Difficulties in the Analysis of Functional-Response Experiments and a Resolution

Williams, Frederick M.; Juliano, Steven A.

doi:10.4039/ent117631-5

Cited by 44 publications

(13 citation statements)

References 20 publications

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“…In case of a Type II response, the handling time and attack rate coefficients were estimated by fitting a modified Holling disk equation to the data (Williams and Juliano 1985):…”

Section: Discussionmentioning

confidence: 99%

Prey density-dependent feeding activity and life history of Scymnus subvillosus

Atlıhan

Güldal

2008

Phytoparasitica

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The functional response, development time, survival and reproduction of the lady beetle Scymnus subvillosus (Goeze) (Coleoptera: Coccinellidae) were evaluated at different densities of the mealy plum aphid Hyalopterus pruni (Geoffroy) (Homoptera: Aphididae). Treatments were carried out at 25±1°C, 60±10% r.h. and 16L:8D photoperiod in a controlled temperature room. The larvae and adults of S. subvillosus were fed with different densities (5, 10, 20, 40 and 80) of H. pruni in petri dishes. The shape of the functional response was determined by logistic regression, and the values of the coefficient of attack rates (α) and handling times (T h ) were estimated by using nonlinear leastsquares regression. Behavior of each larval stage and adults matched Holling's type II functional response. Estimates of α for all stages of S. subvillosus tested were similar, but estimates of T h varied; it was the shortest for adult females and the longest for third instar larva. Larvae were able to complete their development at each of the five prey densities, but increased prey densities reduced development time and mortality rate. Increased prey consumption did not change longevity, but resulted in a higher intrinsic rate of increase (r), the finite rate of increase (λ), net reproduction rate (R 0 ), gross reproductive rates (GRR), and shorter mean generation time (T) and doubling time (DT).

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“…In case of a Type II response, the handling time and attack rate coefficients were estimated by fitting a modified Holling disk equation to the data (Williams and Juliano 1985):…”

Section: Discussionmentioning

confidence: 99%

Prey density-dependent feeding activity and life history of Scymnus subvillosus

Atlıhan

Güldal

2008

Phytoparasitica

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“…The behavioural response of C. carnea to different prey densities was described by fitting Holling's equation to the data (Williams and Juliano 1985):…”

Section: Discussionmentioning

confidence: 99%

Feeding activity and life history characteristics of the generalist predator, Chrysoperla carnea (Neuroptera: Chrysopidae) at different prey densities

Atlıhan

Kaydan

Özgökçe

2004

Journal of Pest Science

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Larvae of the common green lacewing, Chrysoperla carnea (Stephens) (Neuroptera :Chrysopidae) were fed with different densities of Hyalopterus pruni (Geoffer) (Homoptera: Aphididae) in Petri dishes under laboratory conditions. Functional response, developmental time, mortality rate and fecundity of the predator were measured. Treatments were carried out at 25±1°C, 65±5% RH and a 16L:8D photoperiod in a controlled temperature cabinet. Prey was given at densities of 5, 10, 20, 40, 80, 160 and 250 aphids per larva per day and the number of consumed prey, developmental time and mortality rate of the predator were recorded daily. Larvae of C. carnea responded to increasing prey densities with increasing food consumption and older larval stages displayed a higher rate of predation than younger ones. The behaviour of each of the three larval stages matched Holling's type II functional response. Larvae were able to complete their development in each of the seven prey densities, although increased prey densities reduced developmental time and mortality rate. Increased prey consumption in immature stages resulted in a higher net reproduction rate (R 0 ) and the intrinsic rate of increase (r m ) of adult females.

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“…These parameters were estimated using the Maximum Likelihood Analysis (CATMOD) procedure in SAS software (Juliano 2001). In the second step, a nonlinear least square regression was used [Nonlinear (NLIN) procedure with Multivariate Secant or False Position (DUD) method in SAS (2002)] to estimate the functional response parameters of the Holling's disc equation (Williams and Juliano 1985) Then, the obtained parameters were compared [T h and either a (for type II)]. The coefficient of determination was calculated as r 2 = 1 -residual sum of squares/corrected total sum of squares (Allahyari et al 2004;Farrokhi et al 2010).…”

Section: Discussionmentioning

confidence: 99%

Effects of Azadirachtin, Cypermethrin, Methoxyfenozide and Pyridalil on Functional Response of Habrobracon Hebetor Say (HYM.: Braconidae)

Abedi¹,

Saber²,

Gharekhani³

et al. 2012

Journal of Plant Protection Research

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Abstract:Habrobracon hebetor Say is one of the most important natural enemies of the Helicoverpa armigera Hübner (Lep.: Noctuidae). In this study, the sublethal effects of LC 30 concentration of azadirachtin, cypermethrin, methoxyfenozide and pyridalil on the functional response of H. hebetor to different densities of 5th instars larvae of Ephestia kuehniella Zeller were evaluated. Young females were exposed to LC 30 of the insecticides for an appropriate time of exposure. Then, six randomly selected alive females were transferred individually to plastic Petri dishes (10 cm in diameter) and supplied with the following densities: 2, 4, 8, 16, 32 and 64 of 5th instars of E. kuehniella for 24 h. Eight replicates were considered for each insecticide treatment and the control. The results revealed a type II functional response in the control, and all of the insecticide treatments. This study showed that the control and the cypermethrin treatment had the shortest (0.4143 h) and longest (0.624 h) handling time, respectively. The highest (0.0035 per hour) and lowest (0.0029 per hour) attack rate was observed in pyridalil and cypermethrin treatments, respectively. Based on values of handling time, cypermethrin had the highest adverse effect on host-finding in H. hebetor.

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Further Difficulties in the Analysis of Functional-Response Experiments and a Resolution

Cited by 44 publications

References 20 publications

Prey density-dependent feeding activity and life history of Scymnus subvillosus

Prey density-dependent feeding activity and life history of Scymnus subvillosus

Feeding activity and life history characteristics of the generalist predator, Chrysoperla carnea (Neuroptera: Chrysopidae) at different prey densities

Effects of Azadirachtin, Cypermethrin, Methoxyfenozide and Pyridalil on Functional Response of Habrobracon Hebetor Say (HYM.: Braconidae)

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