A Comparative Study on the Functional Response of<i>Wolbachia</i>-Infected and Uninfected Forms of the Parasitoid Wasp<i>Trichogramma brassicae</i>

Farrokhi, Shahram; Ashouri, Ahmad; Shirazi, Jalal; Allahyari, Hossein; Huigens, Martinus E.

doi:10.1673/031.010.14127

Cited by 50 publications

(33 citation statements)

References 39 publications

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“…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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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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“…It is again noteworthy that the biological control literature uses comparative functional responses to make such comparisons, but with different questions in mind. Thus, while Dick et al (2010) explicitly tested the enemy release hypothesis, a study by Farrokhi et al (2010) on Wolbachia-infected parasitoid wasps essentially did the same, but the context was to test the effects of parasitism on the biocontrol efficacy of a control agent (see also Bayoumy 2011). Jones et al (2011) used functional responses of an invasive stoat to examine the dynamics of this predator and its mammal prey.…”

Section: History Of Functional Responses In Invasion Ecologymentioning

confidence: 99%

Advancing impact prediction and hypothesis testing in invasion ecology using a comparative functional response approach

et al. 2013

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Invasion ecology urgently requires predictive methodologies that can forecast the ecological impacts of existing, emerging and potential invasive species. We argue that many ecologically damaging invaders are characterised by their more efficient use of resources. Consequently, comparison of the classical 'functional response' (relationship between resource use and availability) between invasive and trophically analogous native species may allow prediction of invader ecological impact. We review the utility of species trait comparisons and the history and context of the use of functional responses in invasion ecology, then present our framework for the use of comparative functional responses. We show that functional response analyses, by describing the resource use of species over a range of resource availabilities, avoids many pitfalls of 'snapshot' assessments of resource use. Our framework demonstrates how comparisons of invader and native functional responses, within and between Type II and III functional responses, allow testing of the likely population-level outcomes of invasions for affected species. Furthermore, we describe how recent studies support the predictive capacity of this method; for example, the invasive 'bloody red shrimp' Hemimysis anomala shows higher Type II functional responses than native mysids and this corroborates, and could -013-0550-8 have predicted, actual invader impacts in the field. The comparative functional response method can also be used to examine differences in the impact of two or more invaders, two or more populations of the same invader, and the abiotic (e.g. temperature) and biotic (e.g. parasitism) context-dependencies of invader impacts. Our framework may also address the previous lack of rigour in testing major hypotheses in invasion ecology, such as the 'enemy release' and 'biotic resistance' hypotheses, as our approach explicitly considers demographic consequences for impacted resources, such as native and invasive prey species. We also identify potential challenges in the application of comparative functional responses in invasion ecology. These include incorporation of numerical responses, multiple predator effects and trait-mediated indirect interactions, replacement versus non-replacement study designs and the inclusion of functional responses in risk assessment frameworks. In future, the generation of sufficient case studies for a meta-analysis could test the overall hypothesis that comparative functional responses can indeed predict invasive species impacts.Biol Invasions (2014) 16:735-753 DOI 10.1007/s10530

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“…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). An additional 3 × 6 Two-way analysis of variance (ANOVA) was applied to study the possible effects of insecticide, host density, and their interaction on the number of parasitized b. tabaci nymphs by E. mundus.…”

Section: Insectsmentioning

confidence: 99%

Effects of buprofezin and imidacloprid on the functional response of Eretmocerus mundus Mercet

Sohrabi¹,

Shishehbor²,

Saber³

et al. 2014

Plant Prot. Sci.

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Sohrabi F.,Shishehbor P., Saber M., Mosaddegh M.S. (2014): Effects of buprofezin and imidacloprid on the functional response of Eretmocerus mundus Mercet. Plant Protect. Sci., 50: 145-150.Eretmocerus mundus Mercet is one of the key natural enemies of bemisia tabaci (Gennadius). In this study, the sublethal effects of LC 25 of imidacloprid and field-recommended concentration of buprofezin on the functional response of E. mundus to different densities of second instar b. tabaci nymphs were evaluated. The results revealed a type III functional response in the control and imidacloprid treatment. The type III functional response was altered into a type II by buprofezin. Although imidacloprid did not alter the type of functional response of E. mundus compared to the control, it negatively affected the handling time and maximum attack rate of the parasitoid. Therefore, the use of this insecticide should be evaluated carefully in IPM programs.

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A Comparative Study on the Functional Response ofWolbachia-Infected and Uninfected Forms of the Parasitoid WaspTrichogramma brassicae

Cited by 50 publications

References 39 publications

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

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

Advancing impact prediction and hypothesis testing in invasion ecology using a comparative functional response approach

Effects of buprofezin and imidacloprid on the functional response of Eretmocerus mundus Mercet

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