Network of cold scree slope observation. Cold scree slopes are debris slopes which lower part is overcooled by seasonally alternating air circulations. "Abyssal" ecosystems develop on the cooled part, with dwarf trees, arctic-alpine plant, moss and lichen associations, on moor type humus. These sites show a unique combination of geomorphologically induced microclimate, vegetation, soil and soil microfauna. The network of monitoring sites is distributed over the French Alps and Jura mountains.