Figure 4.6 Geographical overview of the proportion of individuals of specific Arctic marine bird populations that are at risk of total-Hg mediated health effects; based on post-2000 monitoring data grouped according to maturity where possible. Results based on bird egg monitoring data and results from monitoring of adult/juvenile birds. The five risk categories are defined using effect threshold categories for North American bird species (Ackerman et al., 2016). See Annex 3 for details of datasets, sources and effects category thresholds.