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- Title
Radioactive cesium contamination and its biological half-life in larvae of <italic>Stenopsyche marmorata</italic> (Trichoptera: Stenopsychidae).
- Authors
Fujino, Takeshi; Kobori, Shota; Nomoto, Takeshi; Sakai, Masaru; Gomi, Takashi
- Abstract
The total radioactive Cs concentration in final-instar <italic>Stenopsyche marmorata</italic> larvae from the Mano River, Fukushima Prefecture, in 2013 was found to be >1000 Bq kg−1 in dry weight. The concentration of radioactive Cs in the river water itself was on the order of 0.01 Bq kg−1, while its concentration in drifting fine particulate organic matter (FPOM) was on the order of 10,000 Bq kg−1 in dry weight. When excretion experiments were performed in the summer and winter, significant decreases in the Cs concentrations in the whole body of <italic>S. marmorata</italic> were observed in both seasons. The biological half-life of Cs-137 was 5.3 and 8.8 h for the nonwintering generation and the wintering generation, respectively. Another elimination test using a stable Cs solution was performed, and the Cs concentration was observed to decrease rapidly to 7.5% of its original level in the digestive tract of <italic>S. marmorata</italic> after 72 h, but stable Cs remained in muscle and extra-alimentary tissue of <italic>S. marmorata</italic>. As the total radioactive Cs in the water was quite low, its concentration in <italic>S. marmorata</italic> from the Mano River reflects the fact that it feeds on FPOM. The radioactive Cs concentration in the FPOM significantly declined in 2015, but a corresponding decline was not observed for <italic>S. marmorata</italic>. We therefore infer that ultrafine particulate matter such as suspended vermiculite clay is strongly contaminated with radioactive Cs, and that this radioactive Cs passes continuously through the digestive tract of <italic>S. marmorata</italic>.
- Subjects
CESIUM &; the environment; HALF-life (Nuclear physics); CADDISFLIES; INSECT larvae; FUKUSHIMA Nuclear Accident, Fukushima, Japan, 2011
- Publication
Landscape & Ecological Engineering, 2018, Vol 14, Issue 1, p37
- ISSN
1860-1871
- Publication type
Article
- DOI
10.1007/s11355-017-0339-5