ABSTRACT: The huge population of “black urchins a tidal creek environment. River, Florida, USA. DACW BLACK GLUME RED. RICE (Oryza sativa L. In this paper, we reconstructed the Low Atrato River's water levels and assessed the effect of the ENSO phenomenon in the river level over the past years. NW, Suite , Washington, DC , USA, Tel. () , Fax: () , e-mail: