| Autor: |
Medvinsky AB; Institute for Theoretical & Experimental Biophysics, Pushchino, Moscow Region, 142290 Russia. medvinsky@iteb.ru, Gonik MM, Li BL, Velkov VV, Malchow H |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of theoretical biology [J Theor Biol] 2006 Oct 07; Vol. 242 (3), pp. 539-46. Date of Electronic Publication: 2006 Apr 28. |
| DOI: |
10.1016/j.jtbi.2006.04.008 |
| Abstrakt: |
Genetically modified crops are effective pest management tools for worldwide growers. However, there is a concern that pests may develop resistance to Bt-toxins produced by genetically modified Bt-plants. We study the impact of the Bt-resistant pests on Bt-crops. Furthermore, the dynamics of the Bt-plant-Bt-susceptible insects-Bt-resistant insects system is analysed and it is shown that throughout the insect reproduction period the plant biomass dynamics resulting from invasion of Bt-resistant insects is non-unique. Namely, the chaotic attractor and the limit cycle, which are responsible for the plant and insect biomass dynamics, are shown to coexist. As a result, the Bt-plant-Bt-resistant insect system can manifest either chaotic or regular oscillations of plant and insect biomass depending on spatial patterns resulting from invasion of Bt resistant insects into the Bt plant-Bt susceptible insect system. We show that the non-uniqueness of the system dynamics under unfavorable environmental conditions, such as in the so-called zones of risky agriculture in many developing countries and industrialized countries, can lead to essential decrease in the plant biomass. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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