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.

为威尔士水域中的入侵性非本地物种传播途径创建了热力图（地理数据库），包括商业航运、休闲航行、水产养殖、捕鱼及海上活动等。热力图以2公里×2公里和5公里×5公里的分辨率生成，并附带符号图层。此外，还生成了一张综合热力图，以突出可能面临入侵性非本地物种入侵风险最高的关键区域。本评估为探究与各潜在引入途径相关的热点区域、不同途径主要风险区域的重叠以及与保护区重叠情况提供了宝贵见解。该评估的输出结果可为生物安全规划提供基础支撑。然而，值得注意的是，这是一项基于仅可免费获取的数据集进行的全国性测绘工作，这些数据集本身由于覆盖范围不完整，在时间和空间上均存在局限性及可能的误差。对输入数据集所应用的评分以及对引入途径所赋予的权重亦基于现有文献和专家判断。特定地点的活动和条件始终是重要的考量因素，同时，时间变化亦不可忽视。