Table 2 |
||
| Effects of hemisphere (northern versus southern) and thermoregulatory strategy (endotherm versus ectotherm) on intraspecific estimates of species ages from temperate-regions across the globe | ||
| Variable | Likelihood ratio (D) | P |
| (a) Complete dataset | ||
| Hemisphere | D = 14.1 | < 0.001 |
| Thermoregulatory strategy | D = 16.1 | < 0.0001 |
| Hemisphere * Thermoregulatory strategy | D = 0.844 | 0.358 |
| (b) High-latitude species | ||
| Hemisphere | D = 13.2 | < 0.001 |
| Thermoregulatory strategy | D = 7.35 | 0.00670 |
| Hemisphere * Thermoregulatory strategy | D = 0.521 | 0.471 |
| (c) Low-latitude species | ||
| Hemisphere | D = 8.98 | 0.00270 |
| Thermoregulatory strategy | D = 60.7 | < 0.0001 |
| Hemisphere * Thermoregulatory strategy | D = 0.652 | 0.419 |
Results are shown for the entire dataset (a), for the subset of species that are distributed above 40° N or S (b), and for the subset of species that are distributed between the tropics and 40° N or S (c). Likelihood ratio tests were conducted between nested models that included and excluded each variable; however, main effects were tested for significance only after excluding the interaction term.
Tingley and Dubey BMC Evolutionary Biology 2012 12:244 doi:10.1186/1471-2148-12-244
