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Kuhn (1962) proposed an evolutionary model to explain how scientificknowledge is built, based on the concept of paradigm. Even though Kuhn's modelis general, it has been applied only to a few topics in evolutionary biology,especially broad-based paradigms. Our goal here is to analyze a small-scaleparadigm change that occurred about the mating system of a Mediterranean shrub:P. angustifolia (Oleaceae) through the lens of Kuhn's model. We first summarizethe different steps of the paradigm change and replace them in the more generalcontext of the sex ratio theory. Second, we show how the different steps of theparadigm changes can be interpreted by Kuhnian concepts and tools. Finally, wediscuss the actual and future status of the new paradigm.

A paradigm shift, or a paradigm adjustment? The evolution of the Oleaceae mating system as a small-scale Kuhnian case-study