Species and habitats - Clupea harengus - Mature - Mean abundance in October, standard deviation and summed kriging error maps during CGFS (1988-2006)

Biologic data have been expressed in abundance (numbers or density values (nbr/km²)) and always required to be log-transformed using a log10(x+1) transformation. Abundance mean (mean) and standard deviation (st) have been calculated. The sum of the kriging error for each yearly kriged abundance fits to the kriging error (v).生物数据常以丰度（abundance）形式给出，其取值可为数量或密度值（单位：个/平方千米），且始终需通过log₁₀(x+1)变换进行对数转换。本数据集已计算得到丰度均值（Abundance mean，缩写mean）与标准差（standard deviation，缩写st）。每年经克里金法（kriging）插值得到的丰度，其克里金误差之和与克里金误差（v）相符。