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Science 19 September 1975:
Vol. 189. no. 4207, pp. 995 - 997
DOI: 10.1126/science.189.4207.995
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Articles

Biological Uptake of Dissolved Silica in the Amazon River Estuary

John D. Milliman 1 and Edward Boyle 2

1 Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543
2 Woods Hole Oceanographic Institution and Department of Earth and Planetary Sciences, Massachusetts Institute of Technology, Cambridge 02139

Approximately 25 percent of the dissolved silica carried by the Amazon River is depleted through diatom production in the inner estuary. Annual production of opaline frustules is estimated to be 15 million tons. However, few diatoms accumulate in modern shelf sediments and chemical recycling appears to be slight. Instead, many frustules apparently are transported landward into the river system, where they deposit in dunes and layers on and within mud and sand bars.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)