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- W2040679196 abstract "Abstract Many insect field populations, especially aphids, often exhibit irregular and even catastrophic fluctuations. The objective of the present study is to explore whether or not the population intrinsic rates of growth ( r m ) obtained under laboratory conditions can shed some light on the irregular changes of insect field populations. We propose to use the catastrophe theory, one of the earliest nonlinear dynamics theories, to answer the question. To collect the necessary data, we conducted a laboratory experiment to investigate population growth of the Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko), in growth chambers. The experiment was designed as the factorial combinations of five temperatures and five host plant‐growth stages (25 treatments in total): 1800 newly born RWA nymphs arranged in the 25 treatments (each treatment with 72 repetitions) were observed for their development, reproduction and survival through their entire lifetimes. After obtaining the population intrinsic rates of growth ( r m ) from the experimental data under various environmental conditions, we built a cusp catastrophe model for RWA population growth by utilizing r m as the system state variable, and temperature and host plant‐growth stage as control variables. The cusp catastrophe model suggests that RWA population growth is intrinsically catastrophic , and dramatic jumps from one state to another might occur even if the temperature and plant‐growth stage change smoothly . Other basic behaviors of the cusp catastrophe model, such as catastrophic jumps , hystersis and divergence , are also expected in RWA populations. These results suggest that the answer to the previously proposed question should be “yes”." @default.
- W2040679196 created "2016-06-24" @default.
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- W2040679196 date "2009-05-01" @default.
- W2040679196 modified "2023-10-17" @default.
- W2040679196 title "An approach to the nonlinear dynamics of Russian wheat aphid population growth with the cusp catastrophe model" @default.
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- W2040679196 doi "https://doi.org/10.1111/j.1748-5967.2009.00216.x" @default.
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