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Cs to web-building spiders, 
, and its pathways; A Preliminary study using stable carbon and nitrogen isotope analysesTanaka, Sota; Kakinuma, Hotaru*; Adachi, Taro*; Atarashi-Andoh, Mariko; Koarashi, Jun
Journal of Nuclear Science and Technology, 58(4), p.507 - 514, 2021/04
Times Cited Count：0 Percentile：0.01(Nuclear Science & Technology)Understanding the pathways of Cs transfer to predatory spiders is useful to assess long-term behavior of Cs in the environment, because spiders obtain food resources from both the grazing and detritus food chains in terrestrial-aquatic linking forest ecosystems. In the present study, we collected spider samples at forest interior and riverside. The sample collection was approximately 6.5 years after the FDNPP accident. Moreover, a transfer factor value (T
) for Cs in spiders was quantified. Stable carbon and nitrogen isotope ratios (
C and 
N) of the spiders were also investigated to estimate the transfer pathways of Cs to the spiders.
Tanaka, Sota; Kakinuma, Hotaru*; Adachi, Taro*; Takahashi, Tomoyuki*; Takahashi, Sentaro*
KEK Proceedings 2019-2, p.179 - 182, 2019/11
The concentration of Cs in flying insects was investigated after the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident. The insects were collected at about 11 km north west of the FDNPP at two different sites in the forest and riverside. The median concentration of Cs in flying insects in the forest was significantly higher than riverside. However, high concentration of Cs in detritus fly (Diptera: Calliphoridae) was observed at both sites. The concentration of fly at the forest and riverside were 16
10
Bq/kg fw and 1810 Bq/kg fw, respectively. The result shows that the concentration of radiocesium in detritus fly were still high 8 years after the accident. This suggests that detritus food chain is a dominant transfer pathway of radiocesium to higher trophic level species such as spiders.
C, N)Tanaka, Sota; Kakinuma, Hotaru*; Adachi, Taro*; Atarashi-Andoh, Mariko; Koarashi, Jun
no journal, ,
Terrestrial arthropods could be an indicator species of long-term behavior of radiocesium through the food chain due to their large biomass and importance as food resources for other organisms. The spider, Nephila clavata, as generalist predators is especially suggested that an indicator species of radiocesium contamination of insect communities because they prey on variety of food resources from both grazing and detrital food chain. In present study, the aggregated transfer factor (T) of Cs for the spiders inhabited at mountainous forest and riverside was calculated using the initial deposition densities map, and stable isotope ratio(C, N) of the spider was measured to determine the transfer pathway of Cs.
