Appendix S1 The 19 land-cover classes available in the 2005 North American Land Cover map produced by the North American Land Change Monitoring System (NALCMS) and the 16 classes used in our analysis (Table S1). The change Akaike's Information Criteria testing for a land-use effect in our estimates of within-year temporal turnover (Table S2).


Appendix S2 An example of the monthly sample coverage estimated for three land-use categories in one North American ecoregion (Fig. S1), the monthly sample coverage values estimated for the three land-use categories in the 44 North American ecoregions (Fig. S2) and the proportion of three land-use categories estimated in the 44 North American ecoregions (Fig. S3).

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