TROPECOS members from IRD Marie ARNAUDResearch Scientist, IRD Nicolas GRATIOTResearch director, IRD Jean-Luc MAEGHTResearch Engineer, IRD (Montpellier) Christophe PROISYResearch scientist, IRD (Cayenne) Vincent VANTREPOTTEResearch Scientist, CNRS - IRD (Wimereux) and visiting professor, Federal University of Permambouco (Brazil)