Species and habitats - Pagurus bernhardus - Presence probability (2006-2012)

Abundances were recoded in term of presence-absence. Geostatistical interpolation : the spatial variation of biological data were analysed using GENSTAT (GENSTAT 7 Committee, 2004), which is a GENeral STATistics package including the main geostatistical tools. It computes experimentala variograms, fits these with various authorised mathematical models and uses them to calculate kriged estimates on a fine regular grid (of latitudes and longitudes). The grid of points was imported into ArcMap and interpolated with the Spatial Analyst extension in order to create a continuous raster of 1 km² resolution. The resulting maps illustrate the spatial distributions and the variations over time for biological data studied in CHARM's area. For legends of maps, approximates of the 5th and the 95th quantiles were used for the minimales and maximales values respectively.物种丰度以存在-缺失（presence-absence）形式进行重编码。 地统计插值环节：采用GENSTAT（GENSTAT 7委员会，2004）对生物学数据的空间变异展开分析，该软件是一款集成主流地统计工具的通用统计分析包。其可计算实验变异函数，使用多种经认可的数学模型对变异函数进行拟合，并基于精细规则经纬度网格计算克里金（kriging）估计值。将该点网格导入ArcMap软件，并借助空间分析（Spatial Analyst）扩展模块完成插值处理，以生成分辨率为1平方千米的连续栅格数据。所得地图清晰展示了CHARM研究区域内目标生物学数据的空间分布特征与时序变化规律。在地图图例中，分别以第5百分位数和第95百分位数的近似值作为最小值与最大值的取值基准。