A Comparison of Methods for Estimating the Functional Response Parameters of the Random Predator Equation

Juliano, Steven A.; Williams, Frederick M.

doi:10.2307/5074

Cited by 87 publications

(57 citation statements)

References 27 publications

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“…2) was used to obtain functional response parameters. The handling time and attack rate for a type III functional response were estimated with replacing Equation (3) (Juliano & Williams 1987) in Equation (2):…”

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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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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“…We tried first to fit a Type II functional response for each of the four experiments using a SAS NONLIN Procedure (SAS Institute 1990), and compared the fit with a linear regression by comparing the coefficient of determination, R 2 , coefficient of variation, CV, the biological relevance of parameter values and their standard errors if necessary (Juliano andWilliams 1987, Lundberg 1988). The R 2 were calculated with the corrected sum-of-square (Motulsky and Ransnas 1987) and we used all individual points to allow a better estimate of the parameter values (Juliano and Williams 1987). The use of the biological criteria is crucial to determine between models that generate similar R 2 and CV (Lundberg 1988).…”

Section: Statistical Analysesmentioning

confidence: 99%

Shape and sources of variations of the functional response of wildfowl: an experiment with mallards, Anas platyrhynchos

Fritz¹,

Durant²,

Guillemain³

2001

Oikos

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Understanding the variations of the functional response of an organism, i.e. the predation rate in relation to prey density, is necessary to understand the interactions between the animal and its food supply. This has received little attention in dabbling ducks so we investigated experimentally the shape of the functional response of mallard feeding on poultry pellets, and assessed the influence of several factors such as the size of food items, sex or individual performance on this functional response. Individual differences in intake rate are of crucial importance in group or gregarious foraging species. We used two approaches of the functional response: 1) the relation between feeding rate (pellets/s) and pellet densities (pellets/m 2 ), and 2) the relationship between instantaneous intake rate (g/s) and biomass density (g/m 2 ). For both approaches, we found that the Type II functional response gave better estimates than a Type I linear functional response but explained only a third of the variance. Our results show that pellet size has a large effect on instantaneous intake rate. The comparison of the functional response parameters suggest that handling time per prey may not reflect the real constraints on intake rate, but that handling time per gram ingested may be more appropriate to integrate the effect of item size in the functional response. We then discuss the possible mechanisms involved. We also found individual variations in the functional response for each of the experiments, with some consistency in the hierarchy regarding feeding efficiency. We did not find any differences between males and females. Our results provide an evaluation of individual variations in intake rate in interference-free conditions, which has rarely been done, and call for more controlled experiments to allow a finer understanding of the mechanisms of food acquisition in dabbling ducks.

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“…Examples can be found in De Wit and Goudriaan (1978), who used De Wit's yield equation (valid only under conditions of constant prey density), Akre and Johnson (1979) who used Holling's disc equation (under the same condition as the former), and Cock (1978), Fernando and Hassell (1980) and Colton (1987), who used Rogers' variant of the Holling disc equation (valid also under condi-tions of prey depletion). Useful comments on estimating the parameters are given by Juliano and Williams (1987).…”

Section: Abstract: Prey Preference -Predation -Behaviour -Acarimentioning

confidence: 99%

How to analyse prey preference when prey density varies? A new method to discriminate between effects of gut fullness and prey type composition

Sabelis

1990

Oecologia

100

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How to analyse prey preference when prey density varies? a new method to discriminate between effects of gut fullness and prey type composition Sabelis, M.W. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible.

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A Comparison of Methods for Estimating the Functional Response Parameters of the Random Predator Equation

Cited by 87 publications

References 27 publications

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

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

Shape and sources of variations of the functional response of wildfowl: an experiment with mallards, Anas platyrhynchos

How to analyse prey preference when prey density varies? A new method to discriminate between effects of gut fullness and prey type composition

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