Transfer of radiocesium to the spider, Nephila clavata, and stable isotope analysis (C, N)

Tanaka, Sota; Kakinuma, Hotaru*; Adachi, Taro*; Atarashi-Andoh, Mariko  ; Koarashi, Jun   

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.