caa a22 4500 397572174 CHVBK 20180308164844.0 cr unu---uuuuu 161202e19960601xx s 000 0 eng 10.1093/ee/25.3.549 doi (NATIONALLICENCE)oxford-10.1093/ee/25.3.549 Functional Responses Revisited [Elektronische Daten] [F. M. Williams, Steven A. Juliano] We note 3 problems with recommendations (Fan, Y., and F. L. Petitt. 1994. Parameter estimation of the functional response. Environ. Entomol. 23: 785-794) for using a linearization of the instantaneous form of the type II functional response ("disc equatioun”) for parameter estimation. First, the disc equation itself is not appropriate for most experimental designs where there is depletion of prey over the course of the experiment. The time integral form (the "random predator” equation) takes into account declining prey density over time, and despite its implicit form, is tractable statistically using the Newton method and nonlinear regression, or a nonparametric method (Juliano, S. A., and F. M. Williams, 1987. A comparison of methods for estimating the functional response parameters of the random predator equation. J. Anim. Ecol. 56: 641-653; Juliano, S. A. 1993. Nonlinear curve fitting: predation and functional response curves. pp.159-182. In S.M. Scheiner and J. Gurevich [eds.], Design and analysis of ecological experiments, Chapman & Hall, New York), Second, the experimental design mimicked in Fan and Petitt's simulations, as well as in some of our earlier simulations, is not one where the disc equation is appropriate; thus, neither study can address the best method for that design. Third, regressions using means of replicated dependent variables, as advocated by Fan and Petitt, ignore interreplicate variation and are likely to lead to overestimation of the precision of parameter estimates, and a greater probability of type I statistical errors. © 1996 Entomological Society of America Forum nationallicence predation nationallicence statistics nationallicence functional responses nationallicence nonlinear regression nationallicence simulations nationallicence Newton method nationallicence Williams F. M. Department of Biology, Penn State University, University Park, PA 16802; and Department of Biological Sciences, Illinois State University, Normal, IL 61790-4120 aut Juliano Steven A. Department of Biology, Penn State University, University Park, PA 16802; and Department of Biological Sciences, Illinois State University, Normal, IL 61790-4120 aut Environmental Entomology Oxford University Press 25/3(1996-06-01), 549-550 0046-225X 25:3<549 1996 25 ee https://doi.org/10.1093/ee/25.3.549 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.3.549 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Williams F. M. Department of Biology, Penn State University, University Park, PA 16802; and Department of Biological Sciences, Illinois State University, Normal, IL 61790-4120 aut NATIONALLICENCE 700 1- Juliano Steven A. Department of Biology, Penn State University, University Park, PA 16802; and Department of Biological Sciences, Illinois State University, Normal, IL 61790-4120 aut NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/3(1996-06-01), 549-550 0046-225X 25:3<549 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford