Table 2.
Bacterial diversity and animal weight within sub-categories, correlation between diversity and weight, and slope of the relationship of the diversity versus log-weight
| Category | Number of samples | Simpson diversity mean (SD) | Weight in kg mean (SD) | Pearson correlation between diversity and weight | Power law relationship diversity = c weightz | |||
|---|---|---|---|---|---|---|---|---|
| cor | p value | Slope z | Confidence interval | |||||
| Sub-categories | ||||||||
| Diet | ||||||||
| Carnivorous | 13 | 32.0 (23.4) | 19.0 (44.1) | 0.277 | 0.359 (NS) | 0.075 (NS) | – | |
| Frugivorous | 10 | 55.2 (68.5) | 1.3 (3.1) | 0.533 | 0.113 (NS) | 0.234 (NS) | – | |
| Granivorous | 54 | 20.4 (21.7) | 4.4 (9.4) | 0.667 | 3.7e−08 (***) | 0.298 (***) | 0.205–0.391 | |
| Herbivorous | 44 | 301.6 (342.3) | 354.5 (668.1) | 0.338 | 0.025 (*) | 0.137 (*) | 0.018–0.256 | |
| Omnivorous | 60 | 111.3 (149.0) | 50.5 (32.4) | 0.542 | 7.7e−06 (***) | 0.361 (***) | 0.214– 0.508 | |
| Piscivorous | 8 | 20.4 (20.8) | 7.5 (5.9) | 0.030 | 0.944 (NS) | 0.029 (NS) | – | |
| Phylogeny | ||||||||
| Bird | 85 | 25.1 (23.6) | 7.8 (23.0) | 0.456 | 1.1e−05 (***) | 0.202 (***) | 0.116–0.288 | |
| Mammal | 101 | 194.9 (268.8) | 183.3 (464.0) | 0.415 | 1.6e−05 (***) | 0.272 (***) | 0.153–0.391 | |
| Reptile | 3 | 119.3 (131.9) | 1.6 (1.2) | 0.964 | 0.172 (NS) | 1.686 (NS) | – | |
| Gut structure | ||||||||
| Caecum | 46 | 70.4 (80.6) | 26.1 (65.3) | 0.528 | 1.7e−04 (***) | 0.397 (***) | 0.203–0.591 | |
| Colon | 124 | 78.5 (122.5) | 79.0 (382.7) | 0.678 | <2.2e−16 (***) | 0.293 (***) | 0.236–0.350 | |
| Rumen | 19 | 484.9 (449.7) | 411.8 (384.5) | −0.036 | 0.883 (NS) | −0.031 (NS) | – | |
| Group size | ||||||||
| Large | 85 | 93.1 (151.0) | 65.8 (156.4) | 0.734 | 1.3e−15 (***) | 0.380 (***) | 0.303–0.457 | |
| Small | 104 | 137.2 (253.7) | 130.6 (449.1) | 0.632 | 6.6e−13 (***) | 0.300 (***) | 0.227–0.372 | |
| Age | ||||||||
| Adult | 173 | 125.6 (222.2) | 110.3 (364.6) | 0.687 | <2.2e−16 (***) | 0.337 (***) | 0.283–0.391 | |
| Baby | 16 | 28.9 (20.1) | 6.3 (2.0) | 0.205 | 0.446 (NS) | 0.427 (NS) | – | |
| All | 189 | 117.4 (214.3) | 101.5 (350.0) | 0.675 | <2.2e−16 (***) | 0.338 (***) | 0.284–0.391 | |
NS not significant
* low significance, *** high significance