Data from: Are earthworms really in decline? Representative data and rigorous modelling approaches are needed to assess large-scale, long-term trends in earthworm populations

Data used for analyses and supporting the findings of the article 'Are earthworms really in decline? Representative data and rigorous modelling approaches are needed to assess large-scale, long-term trends in earthworm populations'. Supporting document contains data descriptions (Table 1), a record of all revisions, omissions and considerations by data source (Table 2), and details of additional data sources augmenting the original dataset (Table 3).