Table 2.
Niche specialization, pair‐wise niche overlap and community niche overlap test results for dominant species in the 50‐ha plot. (a) Spatial‐only analysis of all individuals in 2008, (b) temporal‐only analysis of all individuals during 1988–2012, and (c) spatiotemporal analysis of recruits during 1989–2008
| (a) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Niche specialization | Niche overlap (Community overlap = +0.48 *** ) | |||||||
| ANOL | CASF | HELI | KYDC | LAGL | RAND | TECG | ||
| ANOL | 14.4 | |||||||
| CASF | 18.05 | 0.53 | ||||||
| HELI | 14.92 | 0.33 | +0.5 * | |||||
| KYDC | 14.4 | 0.31 | 0.45 | +0.56 ** | ||||
| LAGL | 20.25 | −0.37 * | 0.55 | 0.44 | 0.39 | |||
| RAND | 16.98 | 0.42 | +0.55 * | +0.49 * | +0.45 * | 0.48 | ||
| TECG | −16.55 * | +0.58 * | 0.61 | 0.38 | 0.37 | −0.51 * | 0.48 | |
| TERT | −15.83 * | +0.61 * | 0.62 | 0.37 | 0.35 | 0.5 | 0.48 | +0.66 * |
| (b) | ||||||||
|---|---|---|---|---|---|---|---|---|
| Niche specialization | Niche overlap (Community overlap = 0.79) | |||||||
| ANOL | CASF | HELI | KYDC | LAGL | LAGP | TECG | ||
| ANOL | 332 | |||||||
| CASF | 327.33 | 0.91 | ||||||
| HELI | 265.26 | 0.58 | 0.64 | |||||
| KYDC | 270.92 | 0.68 | 0.71 | +0.8 | ||||
| LAGL | 326.32 | 0.95 | +0.95 | 0.63 | 0.72 | |||
| RAND | 293.98 | 0.7 | 0.77 | +0.83 | 0.79 | 0.75 | ||
| TECG | 327.86 | 0.96 | 0.94 | 0.61 | 0.71 | 0.98 | 0.73 | |
| TERT | 331.5 | +0.99 * | 0.91 | 0.59 | 0.69 | 0.95 | 0.71 | 0.97 |
| (c) | ||||||
|---|---|---|---|---|---|---|
| Niche specialization | Niche overlap (Community overlap = +0.61 *** ) | |||||
| CASF | HELI | KYDC | LAGL | RAND | ||
| CASF | 9861.67 | |||||
| HELI | 4194.23 | 0.49 | ||||
| KYDC | 7646.75 | 0.61 | +0.76 * | |||
| LAGL | 9079.29 | +0.84 * | 0.56 | 0.63 | ||
| RAND | 5268.38 | 0.53 | +0.67 | 0.62 | +0.6 | |
| TECG | 8526.74 | 0.73 | 0.39 | 0.53 | 0.68 | 0.48 |
Species codes: ANOL, Anogeissus latifolia; CASF, Cassia fistula; HELI, Helicteres isora; KYDC, Kydia calycina; LAGL, Lagerstroemia microcarpa; RAND, Catunaregam spinosa; TECG, Tectona grandis; TERT, Terminalia crenulata. Niche space is defined by (1) the first 5 principal components of edaphic and topographic variables, (2) annual precipitation, and (3) elevation and annual precipitation. Tests for niche specialization are one‐tailed and the test statistic is the generalized standard deviation of species occupancy; values smaller than the 5% quantile of randomizations have a ‘−’ prefix. Tests for niche overlap are two‐tailed and the test statistic is the overlap statistic; values smaller (greater) than the 2.5% (97.5%) quantile of randomizations have a ‘−’ (‘+’) prefix.
Statistically significant results after adjustment for multiple‐hypothesis testing (separately for each analysis and separately for niche specialization and niche overlap) are shown in boldface; *P < 0.05, **P < 0.01, ***P < 0.001.
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