Marine Invasive Non-Native Species (INNS) Pathways Heatmaps for Wales 2020

Heatmaps (geodatabases) were created for invasive non-native species pathways in Welsh waters including commercial shipping, recreational boating, aquaculture, fishing and offshore activities. Heatmaps were produced at both 2km x 2km and 5km x 5km resolutions and have associated symbology layers. An overall heatmap was also produced to highlight key areas which are likely most at risk from invasion of invasive non-native species. This assessment provides a valuable insight into hotspots related to each potential pathway of introduction, the areas where the main areas of risk overlap for the different pathways and their overlap with protected areas. The outputs from this assessment can form the basis to underpin biosecurity planning. It should be noted, however, that this was a national scale mapping exercise based only on freely available datasets, which themselves have limitations and possible inaccuracies due to incomplete coverage, both temporally and spatially. The scorings applied to the input datasets and weightings applied to the introduction pathways are also based on available literature and expert judgement. Site-specific activities and conditions will always be an important consideration, as well as temporal variations.本数据集针对威尔士海域内入侵非本土物种的各类传播路径生成了热图，即地理数据库（geodatabases），涵盖商业航运、休闲游艇、水产养殖、渔业及近海活动。本次生成的热图分辨率涵盖2千米×2千米与5千米×5千米，并配套有符号图层。此外还生成了一张综合热图，用以凸显最易遭受入侵非本土物种入侵的重点区域。本次评估清晰揭示了各潜在引入路径相关的入侵热点、不同路径的核心风险重叠区域，以及这些区域与保护区的重叠情况。本评估的产出结果可作为支撑生物安全规划的核心依据。 但需注意，本次全国尺度的制图工作仅基于公开可用数据集完成，而这些数据集本身因时空覆盖不全存在局限性与潜在误差。输入数据集的评分标准以及引入路径的权重设置，均依托现有文献与专家判断制定。针对具体场地的活动与环境条件，以及时间维度的变化，始终是需要重点考量的因素。