Figure 4.

The relationship between RF and NDVI (as a proxy for habitat clutter). The regression of RF (kHz) and NDVI across populations of R. capensis. Habitat photographs show the vegetation cover and structure for each population, A: Lekkersing (Desert), B: Steenkampskraal (Succulent Karoo), C: De Hoop (Fynbos), D: Knysna (Forest). A key to acronyms used are given in Table 1.

Odendaal et al. BMC Evolutionary Biology 2014 14:60   doi:10.1186/1471-2148-14-60
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