Fig. 2: The probability of N-fixing plant species occurrence on oceanic islands decreases with island isolation, while the proportion depends on island area.
From: Nitrogen-fixing symbiotic bacteria act as a global filter for plant establishment on islands
The probability that N-fixing plant species arrive to oceanic islands decreases with distance from the nearest mainland for all vascular species (GLM, a, p < 0.001, N = 326). The proportion of N-fixing plant species on these islands decreases with distance from mainland only for large, but not small islands (GLM, b, p < 0.001, N = 288; lines represent small (mean − 1 SD), medium (mean) and large (mean + 1 SD) islands). Confidence bands represent 95% confidence intervals. Map of presence of N-fixing plant species globally (C), with filled circles indicating locations with N-fixing plant species present, while empty circles those without N-fixing plant species.
