1. General Model Information
Main medium: terrestrial
Main subject: agriculture, populationdynamics
Organization level: ecosystem, biocoenosis
Type of model: not specified
Keywords: pod midge, dasyneura brassicae, rape, brassica napus, growth, thermal time, life table
Dr. Jorgen Aagaard Axelsen
National Environmental Resarch Institut
Dept. of Terresterial Ecology
Fax : +45 89 20 14 14
The model describes the population development of the pod midge (Dasyneura
brassicae Winn.) in winter rape and spring rape (Brassica napus L.) in Denmark.
The model works on a degree-day time scale and takes calculations of daily
accumulated degree-days above 6-7 oC (egg and larveal development)
and above 8.1oC (development in cocoons inthe soil) as the driving
input parameter. Other important parameters are mortalities at the different
life-stages, which comes from a life table study.An important procedure is
book keeping device, and is used to perform ageing and to some extent also
mortality. The model was inspired strongly by the modeling of Gutierrez et al.
The model was built in order to investigate life table more thoroughly than is
possible by common life table analysis. In addition to identifying key factors,
modeling can be used to quantify changes in these factors.
Source of the Abstract:
Joergensen S.E., B. Halling-Soerensen and S.N Nielsen (Edts.) 1996: Handbook
of Environmental and Ecological Modelling. CRC Press Boca Raton et al. 672 pp.
II. Technical Information
Operating System(s): DOS
III. Mathematical Information
Axelsen, J.A. 1993. Analysis of the population dynamics of the pod gall midge (Dasyneura brassicae Winn.) in winter rape and spring rape by computer simulation. Ecol. Modelling, 69, 443-55.
Gutierrez, A.P., Baumgertner, J.U. and Summes C.G. 1984. Multitrophic models of predator-prey energetics. Can. Entomol. , 116, 923-963.
Gutierrez, A.P., Neuenschwander, P., Schulthess, F., Herren, H.R., Baumgartner, J.U., Wermelinger, B., Löhr, B. and Ellis, C.K. 1988. Analysis of biologycal control of cassava pests in Africa II. Cassava mealybug Phenacoccus manihoti. J. Appl. Ecol., 25, 901-920.
Manetch, T.J. 1976. Time-varying distributed delays and their use in aggregative models of large systems. IEEE Trans. Syst. Man. Cypern., 66, 547-553.
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: R. Patzak : 13.August 1997 -
Status of the document:
last modified by
Tobias Gabele Wed Aug 21 21:44:41 CEST 2002