Simulation models for educational purposes: an example on the coexistence of plant populations.

GOLLUSCIO, R.A.; PARUELO, J.M.; AGUIAR, M.R.

JOURNAL OF BIOLOGICAL EDUCATION

INST BIOLOGY

Año: 1990 vol. 24 p. 81 - 86

0021-9266

A solid background in population ecology is valuable for anyone concerned with natural resources management. However, without the opportunity of field experience, it may be difficult for students to become familiar with some of the principles of population biology. Microcomputers and programmable pocket calculators allow the construction of simple simulation models, making it possible to carry out some ?numerical experiments? in the classroom which may play the same role in the learning process as in vivo experimentation. This work introduces a mathematical model based on the Lotka?Volterra equations and a computer program developed for a programmable calculator. They can be used to assess the influence of environmental heterogeneity and disturbances on the results of competitive relationships between two plant populations. As an example, the interaction between two tussock grass species of the Patagonian steppe, Stipa speciosa Trin. et Rupr. and Festuca pallescens (St Yves) Parodi (the second being less xerophytic than the first one), is analysed.