In figures: 161 hectares, 85 habitats, 650 species of plants, 180 species of birds, 35 species of mammals, 49 species of dragonflies

This mosaic of environments is a fundamental element explaining the interest of the site. One of the factors of this diversity is water: from its absence (dry lawns) to its progressive presence (marshy areas then ponds) or variable (temporarily flooded banks), it conditions the installation of species according to their requirements (the The pond turtle which lives in humid areas and breeds in dry lawns is a good illustration of this complementarity).

For many generations, this site has supported agricultural, fishing and hunting activities that have shaped the environment and influenced the presence of species. For thirty years, the change in traditional practices has led to the degradation of natural areas. The management set up in the Regional Nature Reserve is carried out with local and institutional actors within the framework of a management advisory committee, with the aim of transmitting to future generations the riches of our natural heritage.
The choices of interventions are oriented towards reasoned practices aimed at maintaining open spaces by mowing, grazing and controlling water levels.
The management of the reserve must make it possible to conserve the mosaic of habitats, a symbol of the natural and cultural heritage, characteristic of Isle Crémieu. This diversity of habitats makes it possible to accommodate a large number of species, many of which are considered heritage. Particular attention is paid to rare species for which the reserve plays an important role in terms of population (Pink Turtle, Green Tree Frog, Red Pulsatilla, Bohemian Sedge, Sea Sorrel).
The manager organizes numerous guided tours each year to introduce the general public and schoolchildren to the reserve.