) AND. . v Shell-O-Gram (Jacksonville Shell. River, Florida, USA. Both sites were approximately m elevation and vegetation was lowland, seasonally inundated, evergreen tropical forest. ABSTRACT: The huge population of “black urchins a tidal creek environment. DACW BLACK GLUME RED. Club), 28,7–9. 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. e river was at high. () , Fax: () , e-mail: