Table 1. Detailed results for generalized additive mixed models testing for the effect of the spatial location of heterospecifics on the distance between the carnivore and the reindeer carcass, based on 1,643 simultaneous locations for simultaneous (real-time) locations (A) and a time delay between predator locations of 30 min (B).
WOLVERINE |
LYNX |
|||||||
---|---|---|---|---|---|---|---|---|
estimate | se | edf | p | estimate | se | edf | p | |
A) Simultaneous (real-time) predator locations | ||||||||
Parametric coefficients: | ||||||||
Intercept | 3.07 | 0.05 | <0.001 | 3.1 | 0.06 | <0.001 | ||
Smooth terms: | ||||||||
ƒ (Distance between predators) | 5.67 | <0.001 | 3.86 | <0.001 | ||||
ƒ (Distance competitor-carcass) | 3.79 | <0.001 | 5.15 | <0.001 | ||||
R2 (adjusted) | 0.21 | 0.26 | ||||||
BIC | 1721.9 | 1442.2 | ||||||
B) 30-min time delay between predator locations | ||||||||
Parametric coefficients: | ||||||||
Intercept | 3.07 | 0.05 | <0.001 | 3.02 | 0.07 | <0.001 | ||
Smooth terms: | ||||||||
ƒ (Distance between predators) | 4.33 | <0.001 | 2.12 | <0.001 | ||||
ƒ (Distance competitor-carcass) | 3.89 | <0.001 | 2.73 | <0.001 | ||||
R2 (adjusted) | 0.14 | 0.16 | ||||||
BIC | 1865.2 | 1451.3 | ||||||
edf = estimated degrees of freedom. |
For each species, models (A and B) were compared by using Bayesian Information Criterion (BIC). BIC tend to be more conservative and less prone to overparameterization than Akaike’s Information Criterion55. BIC of the best models are denoted in bold.