Dependence on the environment of the abundance function of light-cone simulation dark matter haloes

8 pages, 9 figuresInternational audienceAims.We study the dependence of the halo abundance function (AF) on different environments in a whole-sky $\Lambda$CDM light-cone halo catalogue extending to z 0.45), which probably implies a significant and recent evolution of the isolation status of the most isolated and most massive haloes