Species and habitats - Liocarcinus Holsatus - 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.生物丰度已按存在-缺失二元状态完成重编码。地质统计学插值分析：本研究采用GENSTAT（通用统计软件包，由GENSTAT 7委员会于2004年发布）分析生物数据的空间变异，该软件集成了主流地质统计学分析工具，可计算实验变异函数，采用多种合规数学模型对其进行拟合，并基于拟合结果在精细规则经纬度网格上计算克里金估计值。将该点网格导入ArcMap软件，借助Spatial Analyst（空间分析）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。最终生成的地图清晰展示了CHARM研究区域内目标生物数据的空间分布格局及其随时间的动态变化。在地图图例制作中，分别以5%分位数与95%分位数的近似值作为最小值与最大值的取值基准。