Transfer of 137Cs to web-building spiders, Nephila clavata, and its pathways: a preliminary study using stable carbon and nitrogen isotope analyses
Transfer of 137Cs to web-building spiders, Nephila clavata, and its pathways: a preliminary study using stable carbon and nitrogen isotope analyses
复制标题
137Cs 向结网蜘蛛 Nephila clavata 的转移及其途径：使用稳定碳和氮同位素分析的初步研究
DOI：
10.1080/00223131.2021.1894255
复制
发表时间：
2021
影响因子：
1.2
通讯作者：
Koarashi Jun
中科院分区：
文献类型：
--
作者：
Tanaka Sota;Kakinuma Hotaru;Adati Taro;Atarashi-Andoh Mariko;Koarashi Jun
了解~(137)Cs向一般捕食者蜘蛛转移的途径，有助于评估~(137)Cs在森林生态系统食物链中的长期循环。在福岛第一核电站事故发生约6.5年后，我们在森林中两种不同的栖息地(森林内部和河流沿线)采集了蜘蛛样本，并测定了它们的137Cs活度浓度和稳定的碳、氮同位素比值(δ13C和δ15N)。在所有地点的蜘蛛中都检测到了137Cs，这表明沉积的137Cs中有相当大一部分仍然是生物可利用的。林内蜘蛛的转移因子(TAG)几何平均值为1.3g×10−3m2 kg−1，沿河蜘蛛的转移因子(TAG)值几何均值为0.8x−3m2 kg−1。不同地点的~(137)Cs活度浓度和标记值无显著差异。相比之下，不同地点蜘蛛的δ13C和δ15N差异显著，表明蜘蛛的食物来源不同。初步结果表明，~(137)Cs向蜘蛛的转移可以作为森林生态系统中~(137)Cs循环的有用指标，但由于高度的变异性，转移途径仍然很难确定。
Understanding the pathways of137Cs transfer to spiders as generalist predators is useful to assess the long-term recycling of137Cs through the food chain in forest ecosystems. Approximately 6.5 years after the Fukushima Dai-ichi Nuclear Power Plant accident, we collected spider samples at two different habitats (in a forest interior and along a river) in a forest and determined their137Cs activity concentrations and stable carbon and nitrogen isotope ratio values (δ13C and δ15N). Across the locations,137Cs was detected in all spiders, indicating that a significant fraction of the deposited137Cs is still bioavailable. The geometric means of the transfer factor (Tag) values were 1.3 × 10−3m2kg−1and 0.8 × 10−3m2kg−1for the spiders in the forest interior and along the river, respectively. There were no significant differences in the137Cs activity concentration andTagvalue between the locations. In contrast, the δ13C and δ15N for the spiders were significantly different between the locations, indicating different food resources of the spiders. The preliminary results indicate that the transfer of137Cs to spiders can be a useful indicator of137Cs recycling in forest ecosystems, but the transfer pathways remain difficult to identify because of high variability.