Abstract
Facing biodiversity’s diminution, two different scientific attitudes prevail : knowledge (inventory, description) and reasoned action (applied questions, hypotheses). As a response to this, population biology, a 20 years old discipline which combines several subjects around the concept of population, should meet fruitfully the institutions for conservation (nature reserves, botanical gardens) in order to put together conservation and the problematics of biodiversity. Three examples are given by the author to illustrate his mind : concerning thyme (Thymus vulgaris L.), thistle (Carduus tenuiflorus and Carduus pycnocephalus) and wheat (Triticum aestivum).
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