enquête (1) échantillonnage (1) protocole (1) eau douce (1) famille (1) Degrees (1) Surveys (1) Environmental sciences (1) Surveys (1) Series (1) Sampling (1) Rivers (1) Fresh water (1) French (1) Families (1) Earth (Planet) (1) Coordinates (1) Sampling (1) Number (1) Family (1)