Peter Sloep

In present day ecology, competition is a subject typically generating controversies that pervade the whole field. Ecology is concerned with relations between organisms and their environment. As the environment of any organism has biotic besides physical components, relations between organisms are obviously important. Competition is one of them. According to many ecologists it crucially affects the fate of populations and species. Precisely this assumption has led to vigorous debates (cf. Lewin 1984).I intend to show that elementary methodological analysis could easily dissolve the controversy. Methodology, indeed, has not always been brought to bear on biology as it should. This point is elaborated at the end of the paper.Ecologists use a variety of descriptive units, beside individual organisms. Here the population - a group of individual organisms of the same species and the community - a group of populations are of special importance.

Ever since ecology's inception, the concept of competition has generated discussion. Recent discussions have focused on the role of interspecific competition in shaping the structure of ecological communities. More in particular, ecologists are split up over the validity of a method that is currently in vogue to discredit explanations of community structure in terms of competition theory. An analysis of this controversy is presented which attempts to show that the discussions so far have focused on the wrong issues. Not the method's ability to generate alternative explanations should be questioned, but its ability to generate superior explanations. The impact of Popperian philosophy of science on the dispute is briefly discussed.

Controversies in science have a tendency to be long-lasting. Moreover, they tend to wither rather than be solved by sorting out the arguments pro and con. Barring the sociological dimension, an important factor in the perpetuation of scientific controversies seems to be the contestants' passion for broad philosophical theses when it comes to defending their respective positions. In this paper one such controversy is analysed. It involves the alleged use of Popperian falsificationism to defend a position in (community) ecology some years ago. The upshot of the analysis is that falsificationism is altogether irrelevant to the controversy's solution; philosophy, though, is utterly relevant if one limits it to elementary, uncontroversial, normative methodological principles.