Broad and flexible stable isotope niches in invasive non-native Rattus spp. in anthropogenic and natural habitats of central eastern Madagascar

Table 3 Results of univariate LMMs for δ¹³C and δ¹⁵N on within-species niche variation in R. rattus

Parameter	β ± SE	t	P	Χ ²*	P*
δ¹³C
Intercept	−22.88 ± 0.30	75.96	<0.001
Anthropogenic steppe^a	0.71 ± 0.26	2.75	0.006
Agricultural field^a	0.58 ± 0.32	1.80	0.072	7.60	0.022
δ¹⁵N
Intercept	7.02 ± 0.54	13.11	<0.001
Anthropogenic steppe^a	0.07 ± 0.18	0.39	0.696
Agricultural field^a	0.34 ± 0.22	1.58	0.114	2.80	0.246

Significant results are marked in italic
Reference level is ^anatural forest
*Χ ² and P values are based on log-likelihood-ratio tests (LRT) comparing models with and without the main effect of habitat type with df = 2

ISSN: 1472-6785