Research on several invertebrate groups was carried out in deciduous forests south of the Alp, which is the  region of Switzerland most affected by wildfire. The aim of the project is to explore the effect of single and regular fire on the invertebrate fauna, which have been assessed using several standardised sampling methods. The first result shows that among spiders and carabid beetles species react differently to fire. The highest number of species of spiders was recorded in 2 year old burned areas. The number of species of carabid beetles appears to be higher in forest areas which have burned frequently. Some first hypotheses about these preliminary results are presented.