Fig. 2: Pollen limitation effect size for records (pollen supplementation experiments) in each combination of threat status and trait category.
From: Global meta-analysis shows that threatened flowering plants have higher pollination deficits
a Total (n of threatened plants = 458, n of non-threatened plants = 1670, p-value = 0.0054); b Autofertility (AF-no: n of threatened plants = 331, n of non-threatened plants = 1310, p-value = 0.0015; AF-yes: n of threatened plants = 89, n of non-threatened plants = 344, p-value = 0.3272); c Self-compatibility (BS1), sc = self-compatible (n of threatened plants = 175, n of non-threatened plants = 697, p-value = 0.0995), p = partial self-compatible (n of threatened plants = 91, n of non-threatened plants = 235, p-value = 0.0063), si = self-incompatible (n of threatened plants = 160, n of non-threatened plants = 717, p-value = 0.4078); d Growth form (LH3), w = woody (n of threatened plants = 220; n of non-threatened plants = 492, p-value = 0.4686), h = herbaceous (n of threatened plants = 238, n of non-threatened plants = 1178, p-value = 0.0081); e Overall floral structure, g = generalized (n of threatened plants = 253, n of non-threatened plants = 1072, p-value = 5.93e-5), s = specialized (n of threatened plants = 205, n of non-threatened plants = 598, p-value = 0.2098); f Type of reward, p = pollen (n of threatened plants = 37. n of non-threatened plants = 143, p-value = 0.0428), n = nectar (n of threatened plants = 142, n of non-threatened plants = 500, p-value = 0.0089), s = specialized (n of threatened plants = 18, n of non-threatened plants = 47, p-value = 0.0874); g Continent (Africa: n of threatened plants = 47, n of non-threatened plants = 87, p-value = 0.2536; Asia: n of threatened plants = 136, n of non-threatened plants = 178, p-value = 0.0314; Europe: n of threatened plants = 82, n of non-threatened plants = 422, p-value = 0.5535; North America: n of threatened plants = 91, n of non-threatened plants = 704, p-value = 0.5660; Oceania: n of threatened plants = 66, n of non-threatened plants = 106, p-value = 0.6328; South America: n of threatened plants = 36, n of non-threatened plants = 173, p-value = 0.2983); h Region (temperate: n of threatened plants = 392, n of non-threatened plants = 1455, p-value = 0.0027; tropical: n of threatened plants = 66, n of non-threatened plants = 215, p-value = 0.9862). The points show the data for all records, and the mean value ± standard error of pollen limitation effect size is shown for each category. Labels of the x-axis were simplified to th (stands for threatened) and non-th (stands for non-threatened). Two-tailed t-tests with Holm adjustment were performed for pairwise comparisons. Significant differences are indicated: *p-value < 0.05; **p-value < 0.01; ***p-value < 0.001. Source data are provided as a Source Data file.
