Victor Dupuy, Jean-Bernard Emond, Lionel Garnery and Nicolas Pollet along with ONF and the Parc Naturel Régional de la Haute Vallée de Chevreuse investigated the state of crested newts populations in the la Claye area in the Natura 2000 « Tourbières et prairies tourbeuses de la forêt d’Yveline » site.
In two days, 14 crested newts were found in 6 of the 12 ponds studied. Samples were obtained for the analysis of the microbiome of the newts in the framework of a study with L. Jardillier, D. Moreira et P. Lopez-Garcia (ESE) who sample microbial communities of one of this ponds since 2013.