EN
This paper discusses the importance of palaeo-ecology envisaged as a partner in interdisciplinary activities conducted for the purposes of the natural and applied sciences as well as the humanities. One of the areas of such research is the Lednicki Landscape Park. Gathered data makes it possible to comprehend the evolution of natural environments in the course of the last dozen, or so, millennia in the conditions of anthropopressure. This evolution could be combined with the results of archaeological and historical studies. The author found that, e.g., the considerable degree of the deforestation of the Lednica Lake area took place already in the ninth century, at least 150 years prior to the reign of Mieszko I.