Association between detection rates and morph frequencies in natural populations. Relative frequencies of three pygmy grasshopper colour morphs (striped, black and grey) in natural populations from three habitat types (100% burned, 50% burned and unburnt) are negatively correlated (rs = −0.71, n = 9, p = 0.032) with rates of detection by humans of images of grasshopper colour morphs presented against samples of visual backgrounds on a computer screen. Relative morph frequencies in the wild were estimated from data for 4,091 individuals comprising 6 samples from recently burnt (1 year after fire) habitats, 7 samples from populations in areas that had burnt 3 or 4 years prior to collection, and 14 samples from populations in unburnt areas (see Table 1). Figure shows means. Dotted and dashed lines indicate relationships among morphs within each of the three backgrounds, and the thick line indicates relationship among morphs across all backgrounds.
Karpestam et al. BMC Ecology 2013 13:17 doi:10.1186/1472-6785-13-17