Fig. 5. Aggregation Index (AI, diamond symbol) and percentage of natural vegetation (PNV, bars) by parcel size, in six subregions; a) Gran Sierra Plegada, b) Llanuras Occidentales, c) Tamaulipas Plains and Hills, d) Karst Huasteco, e) Sierra de Tamaulipas, and f) Veracruz Plains and Hill. Parcel size intervals (x-axis) are shown at the bottom.