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      Fertility and life expectancy of the predator Supputius cincticeps (Heteroptera: Pentatomidae) exposed to sublethal doses of permethrin

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          Abstract

          The stinkbug Supputius cincticeps (Stål) (Heteroptera: Pentatomidae) can be found in agricultural and forest ecosystems feeding primarily on larvae of Coleoptera and Lepidoptera, where it can be exposed to insecticide applications. This study therefore aimed to evaluate the reproductive potential of'S. cincticeps after exposition to sublethal doses of permethrin (5.74 x 10-3, 5.74 x 10-2, 5.74 x 10-1, 5.74 and 57.44 ppb) through the use of a fertility life table. The development cycle of this predator was determined in order to calculate its net reproductive rate (R0), the infinitesimal (r m) and finite (λ) rates of increase in addition to mean generation time (T). The net reproductive (18.31), infinitesimal (r m) (0.050) and finite (λ) (1.051) rates of increase were higher, while generation time (57.93 days) was shorter for S. cincticeps exposed to 5.74x10-1 ppb of permethrin than in the control. This indicates a higher rate of population increase of this predator when exposed to this permethrin dose

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          Statistical inference on associated fertility life table parameters using jackknife technique: computational aspects.

          Knowledge of population growth potential is crucial for studying population dynamics and for establishing management tactics for pest control. Estimation of population growth can be achieved with fertility life tables because they synthesize data on reproduction and mortality of a population. The five main parameters associated with a fertility life table are as follows: (1) the net reproductive rate (Ro), (2) the intrinsic rate of increase (rm), 3) the mean generation time (T), (4) the doubling time (Dt), and (5) the finite rate of increase (lambda). Jackknife and bootstrap techniques are used to calculate the variance of the rm estimate, which can be extended to the other parameters of life tables. Those methods are computer-intensive, their application requires the development of efficient algorithms, and their implementation is based on a programming language that encompasses quickness and reliability. The objectives of this article are to discuss statistical and computational aspects related to estimation of life table parameters and to present a SAS program that uses jackknife to estimate parameters for fertility life tables. The SAS program presented here allows the calculation of confidence intervals for all estimated parameters, as well as provides one-sided and two-sided t-tests to perform pairwise or multiple comparison between groups, with their respective P values.
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            Is hormesis an evolutionary expectation?

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              Evidence That Hormesis Represents an “Overcompensation” Response to a Disruption in Homeostasis

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                Author and article information

                Journal
                bres
                Biological Research
                Biol. Res.
                Sociedad de Biología de Chile (Santiago, , Chile )
                0716-9760
                2005
                : 38
                : 1
                : 31-39
                Affiliations
                [02] Viçosa State of Minas Gerais orgnameUniversidade Federal de Viçosa orgdiv1Departamento de Biologia Geral Brasil
                [01] Viçosa State of Minas Gerais orgnameUniversidade Federal de Viçosa orgdiv1Departamento de Biologia Animal Brasil
                Article
                S0716-97602005000100005 S0716-9760(05)03800105
                10.4067/S0716-97602005000100005
                69a09046-eaaa-4fca-a913-5fc8ad33d984

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 15 December 2004
                : 20 May 2004
                : 30 November 2004
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 37, Pages: 9
                Product

                SciELO Chile

                Categories
                Articles

                Asopinae,reproduction,pyrethroids,biological control
                Asopinae, reproduction, pyrethroids, biological control

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