Environmental Entomology 

About: Environmental Entomology is an academic journal published by Oxford University Press. The journal publishes majorly in the area(s): Population & Aphid. It has an ISSN identifier of 0046-225X. Over the lifetime, 10456 publications have been published receiving 261429 citations.

Life-Table Analysis Incorporating Both Sexes and Variable Development Rates Among Individuals

Abstract: Raw data analysis of an age-stage, two-sex life table, incorporating variable development rates among individuals, is described, using data obtained from rearing the potato tuberworm, Phthorimaea operculella (Zeller) (Lepidoptera: Gelechiidae). The intrinsic rate of increase is calculated with respect to both sexes. The stable age-stage distribution, stable age distribution, and the stable stage distribution are also calculated. Different results are obtained when the same data are analyzed using the traditional age-specific life table (Leslie matrix or Birch's method). These differences occur because the traditional age-specific life table deals only with female populations and does not take variable development rates among individuals into account. The relationship between the net reproduction rate and mean female fecundity in the age-stage, two-sex life table is described by a simple formula.

An Analytic Model for Description of Temperature Dependent Rate Phenomena in Arthropods

Abstract: A new description of temperature-dependent, rate phenomena was deduced to describe developmental time and ovipositional data for the McDaniel spider mite, Tetranychus mcdanieli McGregor. The derived equation accounted for asymmetry about optimum temperature and was of particular utility for description of systems operating at or above optimum temperatures. Ovipositional and developmental rate functions were used in a temperature-driven, discrete-time, simulation model describing McDaniel spider mite population dynamics. Temperature dependence of the instantaneous population growth rate was determined by fitting the derived rate-temperature function to data generated through simulation at various fixed temperatures. The functional relationship of important population parameters to temperature provided the mechanism for inclusion of phenological effects on mite populations in a synoptic apple pest management model. Two derived functions were fit to several published rate-temperature data sets. Adequacy of description (as indicated by R2 values) indicated general applicability of both functions for description of temperature-controlled, biological processes. Further, it was concluded that the singular perturbation method of matched asymptotes has potentially wide application in ecology, and an Appendix detailing the application of this method is included.

A Novel Rate Model of Temperature-Dependent Development for Arthropods

Abstract: Two novel and simple mathematical models of arthropod temperature-dependent development are proposed. These models are easy to use and have 3 (equation 1) and 4 (equation 2) ecologically meaningful parameters, respectively. Each parameter can be estimated using nonlinear regression. These models were used to compare developmental rates at constant temperatures for our own experiments on Lobesia botrana (Dennis & Schiffermuller) and for data from 6 insect species described (a total of 13 stages). In all cases, we obtained an accurate nonlinear description of the rate of development against temperature given by the adjusted R 2 ([Kvalseth, 1985][1]). The adjusted R 2 calculated extended from 0.86 to 0.99 and were identical for our equations 1 and 2. In all cases, equation 2 provided the lowest residual sums of squares. The models gave upper T L and lower T temperature threshold estimations, and the estimations obtained were better by using equation 1 rather equation 2. Confidence intervals for each parameter were given and a comparison between estimated and observed temperature thresholds were presented. [1]: #ref-11

Complex Population Dynamics: A Theoretical/Empirical Synthesis

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Improved Rate Model of Temperature-Dependent Development by Arthropods

Abstract: We proposed two improvements to the Logan model of temperature-dependent development. We first eliminated a redundant parameter (modification 1) then incorporated an intercept parameter (modification2), thereby resolving the inability of the original model to estimate a low-temperature developmental threshold. The three model versions were compared using temperature-dependent developmental rates in six insect species (a total of 11 life stages).The original model and modification 1 produced identical curves. In 10 of the 11 cases, modification2 had the highest r2 and the least estimation bias.