Los sitios están localizados a lo largo del bioma de pastizal semiárido que se extiende desde el norte del estado de Chihuahua, hasta la subprovincia geográfica de los Llanos de Ojuelos en el noreste

The Niwot Ridge Long Term Ecological Research (LTER) site was established in 1980 with support from the National Science Foundation.

The majority of the Luquillo Long-Term Ecological Research (LUQ) program takes place in the Luquillo Mountains of Puerto Rico.

Beech forest in the Central italian Apennines

Lake Maggiore was studied since the beginning of last century although not systematically. Regular research started by the foundation in 1938 of the Italian Institute of Hydrobiology "Dr.