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. 2015 Nov 10;10(11):e0142621. doi: 10.1371/journal.pone.0142621

Fig 9. Variations in orchid species richness (SR, panel A-B) and species density (SD, panel C-D) as function of aridity index (AI).

Fig 9

(A) Specimen: SR = -7915.83 + 23390.57*AI − 21631.42*AI2 + 6422.12*AI3; Genus: SR = -2583.24 + 7696.96*AI − 7211.44*AI2 + 2176.77*AI3; Species: SR = -457.22 + 1371.72*AI − 1296.08*AI2 + 394.95*AI3. (B) Epiphytic: SR = -4895.03 + 15199.08*AI − 15093.54*AI2 + 4853.48*AI3; Terrestrial: SR = -487.48 + 1045.23*AI– 435.60*AI2–55.98*AI3; Saprophytic: SR = 5.08 − 36.50*AI + 65.40*AI2–30.80*AI3. (C) Specimen: SD = -630.60 + 1833.93*AI − 1649.22*AI2 + 472.65*AI3; Genus: SD = -201.64 + 597.98*AI − 551.41*AI2 + 163.02*AI3; Species: SD = -457.22 − 457.22*AI − 1296.08*AI2 + 394.95*AI3. (D) Epiphytic: SD = -462.81 + 1436.61*AI − 1424.98*AI2 + 457.52*AI3; Terrestrial: SD = 2.16 − 52.26*AI + 113.41*AI2 − 56.58*AI3; Saprophytic: SD = 3.43 − 12.62*AI + 15.49*AI2 − 5.98*AI3.