1. General Model Information

Name: DASYNEURA-population


Main medium: terrestrial
Main subject: agriculture, populationdynamics
Organization level: ecosystem, biocoenosis
Type of model: not specified
Main application:
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
Vejlsovej 25
DK-8600 Silkeborg
Fax : +45 89 20 14 14


J.A. Axelsen


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. (1984, 1988).

Model purpose
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

II.1 Executables:

Operating System(s): DOS

II.2 Source-code:

Programming Language(s):

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

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

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