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Twenty-one species of seaweed from the California coast were analyzed for rhenium. For the first time, high enrichment (thousandfolds) of rhenium relative to seawater was found in brown algae, but not in green or red algae. Brown algae was suggested as a biological sink of rhenium in the sea and the analogous behavior of technetium to rhenium was found in marine algae. Preliminary incubation experiments with a common brown alga (Pelvetia fastigiata) showed that algal surface is not a major accumulating locus of rhenium.

Yang, J.S., and Park, K., 2014. Changes in water quality after the construction of an estuary dam in the Geum River Estuary Dam system, Korea. Journal of Coastal Research, 30(6), 1278-1286. Coconut Creek (Florida), ISSN 0749-0208.We investigated long-term changes in water quality due to the construction of an estuary dam in the Geum River Estuary Dam System, Korea. Both the upstream reservoir and downstream estuarine sides of the dam were examined. Water quality conditions for nutrients and chlorophyll a (Chl-a) have deteriorated considerably since the dam construction in 1994, with the reservoir water damaged more severely than the estuarine water. Improved water clarity and an enhanced level of nutrients resulted in an order of magnitude increase in Chl-a, indicating excessive phytoplankton growth in the reservoir after dam construction. The hydrology-related principal component (precipitation and discharge) was the most important and the autochthonous primary production-related principal component (nutrients and Chl-a) was the second most important factors affecting the postdam water quality conditions in both the reservoir and estuary. The cumulative load difference analysis revealed that the reservoir was a sink site for PO 3À 4 and NH þ 4 as well as a source site for Chl-a owing to excessive phytoplankton growth in the reservoir. The discharge from the reservoir dominated the estuarine water quality during wet seasons.ADDITIONAL INDEX WORDS: Reservoir, estuary, hydrology, autochthonous primary production.

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