Fig. 6: Distribution of diet, habitat, and net primary productivity (NPP) categories in shape space.
From: Evolution of the bovid cranium: morphological diversification under allometric constraint
Habitat and NPP use just 20% most commonly occurring species in each category (see also Supplementary Fig. 8). Some discrimination can be seen along PC1 and PC2, but otherwise all categories exhibit high morphological overlap and differences are not significant. Habitat abbreviations: DBF tropical and subtropical dry broadleaf forests, DXS tropical and subtropical deserts and xeric shrublands, GSS grasslands, savannas, and shrublands, MBF moist broadleaf forests, MGS montane grasslands and shrublands. NPP is in trillions of kgs of carbon per 1 degree square.
