Parallel shifts in ecology and natural selection in an island lizard

Table 1 Selection gradients for all traits and all years on Kidd cay.

W (2003) 33.8% survival	β/γ	SE	χ²	P-Value
Hindlimb	0.09	0.14	0.57	0.45
Forelimb	0.03	0.14	0.06	0.79
Hindlimb²	-0.34	0.22	3.19	0.07
Forelimb²	-0.30	0.26	1.96	0.16
Hindlimb × Forelimb	0.293	0.16	4.14	0.04
W (2003) Kidd cay
SVL	0.03	0.17	0.39	0.53
SVL²	0.16	0.20	0.57	0.45
W (2004 Animals replaced) 32% survival
Hindlimb	-0.13	0.15	0.77	0.37
Forelimb	-0.13	0.15	0.66	0.42
Hindlimb²	0.14	0.20	0.49	0.48
Forelimb²	0.24	0.26	1.07	0.30
Hindlimb × Forelimb	0.01	0.17	0.00	0.96
W (2004)
SVL	0.05	0.15	0.11	0.74
SVL²	0.60	0.22	6.88	0.009
W (2005) 45% survival
Hindlimb	0.04	0.12	0.04	0.84
Forelimb	-0.03	0.12	0.18	0.67
Hindlimb²	-0.006	0.16	0.00	0.96
Forelimb²	0.38	0.18	4.39	0.04
Hindlimb × Forelimb	-0.13	0.18	0.52	0.47
W (2005)	β/γ	SE	χ²	P-Value
SVL	-0.23	0.11	4.29	0.04
SVL²	-0.12	0.16	0.63	0.43
W (2006) 42% survival
Hindlimb	-0.03	0.10	0.00	0.98
Forelimb	0.13	0.10	0.44	0.50
Hindlimb²	0.12	0.12	0.80	0.37
Forelimb²	-0.10	0.14	0.75	0.38
Hindlimb × Forelimb	-0.21	0.09	5.64	0.02
W (2006)
SVL	0.09	0.13	0.46	0.50
SVL²	0.02	0.18	0.02	0.88

Data distributions were standardized (by year) to mean zero and unit variance. Hind and forelimb lengths refer to residual values (regression of log-transformed limb and snout-vent-lengths. W represents survival (0/1). Linear (β) and non-linear (γ) selection gradients come from general linear models, but significance tests were computed from logistic regressions. Quadratic gradients and associated standard errors were doubled [34].

ISSN: 2730-7182