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Nishikawa, J. ., University of Tokyo, Chiba, Japan, jn@aori.u-tokyo.ac.jp
Fisher, N. S., State University of New York, Stony Brook, USA,
Miyamoto, H. ., University of Tokyo, Chiba, Japan,
Baumann, H. ., State University of New York, Stony Brook, USA,
Baumann, Z. ., State University of New York, Stony Brook, USA,
Buesseler, K. O., Woods Hole Oceanographic Institution, Woods Hole, USA,
George, J. ., State University of New York, Stony Brook, USA,
Tsuda, A. ., University of Tokyo, Chiba, Japan,
Uematsu, M. ., University of Tokyo, Chiba, Japan,

TRENDS IN COMMUNITY STRUCTURE OF ZOOPLANKTON AND MICRONEKTON FROM WATERS NEARBY FUKUSHIMA AND THEIR RELATION TO BIOACCUMULATED CESIUM RADIONUCLIDES

The release of artificial radionuclides into the ocean from the Fukushima Daiichi nuclear plant is the largest accidental release into the ocean in history. Of particular interest is the bioaccumulation of long-lived radionuclides in marine food chains. Despite their importance, information on radionuclide bioaccumulation in zooplankton and micronekton in the western Pacific is limited, and in particular there is sparse information on the relationship between radionuclide uptake and the composition of these animal communities. A US-Japan collaborative cruise in June 2011 enabled us to collect zooplankton and micronekton samples between 141˚E (~30 km away from the plant) and 147˚E. Both 134Cs and 137Cs were detectable in various zooplankton taxa mixed together and micronekton at most sampled stations. 137Cs concentrations exceeded recent background levels by 2 to 3 orders of magnitude, however at levels below current Japanese standards for seafood safety, and Cs concentration factors were typically higher in the decapod-dominated community than the euphausiid-dominated community. The relationship between community structure of zooplankton/micronekton and radionuclide concentrations will be discussed.

Session #:088
Date: 2/21/2012
Time: 12:15
Location: Ballroom E

Presentation is given by student: No