Real C, Fernández J A, Aboal J R, Carballeira A
Ecología, Escuela Politécnica Superior, Universidad de Santiago de Compostela, 27002 Lugo, Spain.
Ecotoxicol Environ Saf. 2008 Jul;70(3):392-9. doi: 10.1016/j.ecoenv.2008.01.005. Epub 2008 Mar 4.
We present the results of the analysis of several datasets corresponding to the mercury contents of moss tissues. Some of the data were collected in regional surveys devised to study the atmospheric deposition of pollutants in Galicia (Spain). The surveys were carried out with low frequency (usually biennially) and the data obtained were compared with similar data collected with high frequency (monthly or bimonthly) at several locations in the same area. The temporal series of data demonstrated the existence of strong pulses of mercury deposition of small duration. They caused dramatic increases in the Hg contents in the samples from some localities and, sometimes, modified the Hg contents of the mosses in the complete study area. Our results demonstrate the low probability of detecting pulses in surveys separated so widely in time. This suggests that the information obtained in regional surveys should be complemented with data collected with high frequency.
我们展示了对几个与苔藓组织汞含量相对应的数据集的分析结果。其中一些数据是在旨在研究西班牙加利西亚地区污染物大气沉降的区域调查中收集的。这些调查频率较低（通常每两年一次），并将获得的数据与在同一地区几个地点高频（每月或每两个月一次）收集的类似数据进行了比较。数据的时间序列表明存在持续时间短的强烈汞沉降脉冲。它们导致一些地点样本中的汞含量急剧增加，有时还改变了整个研究区域苔藓中的汞含量。我们的结果表明，在时间间隔如此大的调查中检测到脉冲的可能性很低。这表明区域调查中获得的信息应辅以高频收集的数据。
