Does the oviparity-viviparity transition alter the partitioning of yolk in embryonic snakes?

Table 2 Parameters of regressions between each pair of three main body components (dry carcass, dry residual yolk and dry fat bodies) estimated with ordinary least squares (OLS) and phylogenetic generalized least squares (PGLS) regression models

Models	N	Slope	Elevation	r ²	ln likelihood	AIC	λ	F _{1, 18}	P-value
OLS regression model
Carcass vs Residual yolk	20	1.70 ± 0.23	0.62 ± 0.14	0.74	−13.43	32.86		52.34	< 0.0001
Fat bodies vs Residual yolk	20	0.53 ± 0.06	0.12 ± 0.04	0.80	13.27	−20.55		73.84	< 0.0001
Carcass vs Fat bodies	20	3.25 ± 0.16	0.23 ± 0.07	0.96	4.16	−2.33		390.63	< 0.0001
PGLS regression model
Carcass vs Residual yolk	20	1.50 ± 0.19	0.39 ± 0.31	0.76	−8.50^a	25.00	0.84	59.90	< 0.0001
Fat bodies vs Residual yolk	20	0.46 ± 0.06	0.10 ± 0.07	0.79	15.01	−22.03	0.54	59.52	< 0.0001
Carcass vs Fat bodies	20	3.13 ± 0.17	0.16 ± 0.13	0.95	7.26^a	−6.53	0.75	353.10	< 0.0001

Models with a superscript of ^a are significantly better than their alternate OLS or PGLS models

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