Abstract
The aim of the study was to develop a stage-structured within-patch model describing predator-prey interactions of Cheyletus eruditus (Schrank) and Acarus siro L. on stored grain. Parameterisation of the model was done using data from the literature. Due to considerable variance in these data, statistical methods were used to extrapolate the parameters. The results of the simulations were compared with the experimental control of A. siro by C. eruditus on wheat. The results indicated that all life-history studies of A. siro yielded overestimated parameters leading to an unnaturally rapid population growth of A. siro on grain. The main reason seems to be the use of high quality food (wheat germs), which considerably increased fecundity. A new model with reduced fecundity was found to correspond well with the observed dynamics in a granary. The model of C. eruditus, including parameters from different sources, produced dynamics quite similar to the observed one. A simulation of biological control under laboratory conditions, on 45 g of wheat, showed that C. eruditus is able to control A. siro within the observed period. In contrast, simulation of the control in a granary showed a marked difference in comparison with the observed dynamics. The discrepancy is attributed to the effects of spatial factors, such as immigration. The predator-prey model developed here appears to be valid for the prediction of the local (within-patch) population dynamics of A. siro and C. eruditus on wheat grain at 20 °C and 80% RH.
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Notes
Densities in this paper include only mobile stages of mites in order to be consistent with data from the literature.
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Acknowledgements
We would like to thank A. Honěk, V. Jarošík, V. Stejskal and two anonymous referees for valuable comments. This work was supported by grant no. OC 842.10 (EŽ) and by grant no. 01–01–03 from the Ministry of Agriculture, the Czech Republic (SP).
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Pekár, S., Žďárková, E. A model of the biological control of Acarus siro by Cheyletus eruditus (Acari: Acaridae, Cheyletidae) on grain. J Pest Sci 77, 1–10 (2004). https://doi.org/10.1007/s10340-003-0019-0
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DOI: https://doi.org/10.1007/s10340-003-0019-0