How Insecticides Trigger Single-Stage Outbreaks in Tropical Pests

Godfray, H. C. J.; Chan, M.

doi:10.2307/2389594

Cited by 25 publications

(9 citation statements)

References 19 publications

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“…Consistent with this, in our model, intraspecific competition alone cannot be at the origin of generation cycles. However, as shown by previous work, parasitism can favour generation cycles if the ratio between host and parasitoid development times leads to a gap between host and parasitoid density peaks (Godfray and Hassell 1987, Godfray and Hassell 1989, Godfray and Chan 1990, Reeve et al 1994, Briggs and Godfray 1995, Knell 1998. Consequently, there is an antagonistic effect between parasitism and intraspecific competition and, depending on the relative strengths of each of these two mechanisms, one or the other predominates.…”

Section: Discussionmentioning

confidence: 85%

“…The effect of the distribution of attacks on the dynamics of host‐parasitoid models has received considerable attention in the last few decades (Bernstein 2000). Previous theoretical work (Godfray and Hassell 1987, 1989, Godfray and Chan 1990, Reeve et al 1994) has shown that parasitism can lead to generation cycles if parasitoid attacks are moderately density‐dependent (i.e. if the instantaneous rate of parasitism is non‐linearly related to parasitoid density).…”

Section: Discussionmentioning

confidence: 99%

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Combined effects of intraspecific competition and parasitoid attacks on the dynamics of a host population: a stage‐structured model

Spataro¹,

Bernstein²

2004

Oikos

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Spataro, T. and Bernstein, C. 2004. Combined effects of intraspecific competition and parasitoid attacks on the dynamics of a host population: a stage-structured model. Á/ Oikos 105: 148 Á/158.Although it is well known that intraspecific competition affects host-parasitoid dynamics, previous studies have adopted oversimplified descriptions of competition. We developed and analysed a host-parasitoid stage-structured model in which host intraspecific competition is accounted for by a flexible density dependence function. We focused particularly on the influence of two factors generally neglected in previous studies: the strength of competition and possible differences in the effect of intraspecific competition between healthy and parasitized hosts. We showed, by means of a combination of analytical studies and simulations, that the presence of parasitoids in the system markedly changes the effects of competition on population dynamics. In particular, position in the ''contest''-''scramble'' spectrum, which plays a crucial role in single-population dynamics, may have a smaller effect in populations subjected to parasitism. We also showed that stability is increased when healthy hosts are more susceptible to competition than parasitized hosts. The effects of host intraspecific competition and its characteristics on dynamics strongly depend on the characteristics of parasitism and on the distribution of attacks in particular. Moreover, interactions between top-down (parasitism) and bottom-up (intraspecific competition) effects may be crucial for the regulation of host-parasitoid systems.

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Section: Discussionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Combined effects of intraspecific competition and parasitoid attacks on the dynamics of a host population: a stage‐structured model

Spataro¹,

Bernstein²

2004

Oikos

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“…Models including seasonally varying parameters have been shown to produce a wealth of complex dynamics in addition to alternative stable cycles (Godfray and Chan 1990, Roberts and Grenfell 1991, Bolker and Grenfell 1993, Hanski et al 1993, Jansen and Sabelis 1995, White et al 1996. Nonetheless, the potential population dynamical consequences of seasonality and periodic environmental changes are still largely unappreciated.…”

Section: Discussionmentioning

confidence: 99%

Periodic Mortality Events in Predator–prey Systems

Ives

Gross

Jansen

2000

Ecology

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Many species experience periodic mortality events, often in the form of winter, yet there is little understanding of how periodic mortality may affect population dynamics. We investigate the effects of periodic mortality on the population dynamics of a predator and its prey, both of which have multiple generations between mortality events. Using the simplest possible model of predator-prey interactions, we show that periodic mortality may produce complex dynamics including alternative stable cycles. Periodic mortality events may also create predator-prey cycles that rotate backwards, with prey densities lagged behind predator densities. The addition of random environmental variability to the model demonstrates that periodic mortality can be a strong driver of population variability, with the vestiges of deterministic cycles taking the form of eruptive patterns in the long-term dynamics of the predator-prey system. These results show that the longterm population dynamics of systems experiencing regular episodes of mortality may exhibit a wealth of patterns not seen in the absence of periodic mortality events.

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“…(Rajagopalan and Alderungboye 1970; Calvez 1976; Godfray and Chan 1990; Mariau and associates 1972–2004; Cochard et al 2005). Coelaenomenodera Maulik is by far the best-known genus because three species are significant pests of oil palm in Africa and have received much research attention, especially by the French agro-entomologist, Dominique Mariau.…”

Section: Introductionmentioning

confidence: 99%

Natural history of Javeta pallida Baly, 1858 on Phoenix palms in India (Chrysomelidae, Cassidinae, Coelaenomenoderini)

Shameem¹,

Prathapan²,

Nasser³

et al. 2016

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Members of the Old World hispine tribe, Coelaenomenoderini, are documented on host plants of Arecaceae, Cyperaceae, and Zingiberales. A few species are renowned pests of oil palm, especially in Africa. The host plants and natural history of Javeta pallida Baly, 1858, the only Indian species of the tribe, is reported for the first time. These beetles can densely infest indigenous wild date palms, Phoenix sylvestris (L.) Roxb. (Arecaceae), and also use the introduced date palm, Phoenix dactylifera L., which is an expanding crop in India. Javeta females lay single eggs and cover each with an ootheca. All larval stages mine the leaves and pupation occurs within the larval mine. Adults are exophagous, leaving linear feeding trenches. Natural and induced infestations of Javeta pallida on these two palms were observed and the potential of Javeta pallida as a pest of date palm in India is discussed. Javeta pallida completed development on Phoenix palms in 52–88 days (mean 66.38 days) with egg period 11–15 days (mean 12.8 days), larval period 21–54 days (mean 33.02 days) and pupal period 17–23 days (mean 20.52 days). Elasmus longiventris Verma and Hayat and Pediobius imbreus Walker (Hymenoptera: Eulophidae) parasitize the larva and pupa of Javeta pallida.

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How Insecticides Trigger Single-Stage Outbreaks in Tropical Pests

Cited by 25 publications

References 19 publications

Combined effects of intraspecific competition and parasitoid attacks on the dynamics of a host population: a stage‐structured model

Combined effects of intraspecific competition and parasitoid attacks on the dynamics of a host population: a stage‐structured model

Periodic Mortality Events in Predator–prey Systems

Natural history of Javeta pallida Baly, 1858 on Phoenix palms in India (Chrysomelidae, Cassidinae, Coelaenomenoderini)

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