Definition:
Perturbation ou réduction de la pénétration de la lumière dans l’eau résultant de la présence de matière en suspension, de matière colloïdale ou de matière dissoute, ou de la présence d’organismes planctoniques.
Source:
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Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO. 2008. FAO online glossary