2. Multiple regression analysis models.

Model	R2	AIC	dAIC	df	Nor. test P value	Hom. test P value	Aut. test P value
AIC: Akaike information criterion, employed to select“best model”, was used to test whether environmental factors rather than intrinsic reproductive traits are main drivers of reproductive output. Var1: Snout-vent length, Var2: Body mass, Var3: Primary follicles number, Var4: Secondary follicles number, Var5: Fat body area, and Var6: Stomach bolus volume, Var9: Height of piles of palm leaves, Var10: Testicular volume, Var11: Width of sexual segment of kidney, and Var12: Distal width of deferent duct. R2: Proportion of variance for reproductive output explained by microenvironment or reproductive intrinsic trait variables. Nor. test: Kolmogorov-Smirnov test for normality; Hom. test: Breusch-Pagan test for homoscedasticity; Aut. test: Durbin-Watson test for autocorrelation.
Clutch size versus female reproductive drivers
Clutch size vs. Var2+Var3+Var4	0.70	–90.62	0.0	1	0.07	0.35	0.63
Clutch size vs. Var2+Var3+Var4+Var5+Var6		–89.16	–1.46	1
Clutch size vs. Var1+Var2+Var3+Var4+Var5+Var6		–87.28	–2.98	1
Clutch size vs. Var1+Var2+Var3+Var4+Var5+Var6+Var9		–85.35	–5.39	1
Secondary follicles versus female reproductive drivers
Secondary follicles vs. Var2+Var5+Var6	0.42	11.18	0.0	1	0.17	0.36	0.87
Secondary follicles vs. Var2+Var5+Var6+Var9		11.69	0.51	1
Secondary follicles vs. Var2+Var3+Var5+Var6+Var9		13.24	2.06	1
Secondary follicles vs. Var1+Var2+Var3+Var5+Var6		15.21	4.03	1
Sperm count versus male reproductive traits and environmental variables
Sperm count vs. Var2+Var6+Var9	0.198	–166.21	0.0	1	0.07	0.34	0.2
Sperm count vs. Var1+Var2+Var6+Var9		–165.20	–1.01	1
Sperm count vs. Var1+Var2+Var6+Var9+Var10		–163.32	–2.89	1
Sperm count vs. Var1+Var2+Var6+Var9+Var10+Var11		–161.38	–4.83	1
Neonates versus prey abundances
Neonates vs. Slugs+Snails	0.46	–9.06	0.0	1	0.34	0.50	0.46
Neonates vs. Slugs+Snails+Leeches		–7.60	1.46	1
Neonates vs. Slugs+Snails+Leeches+Earthworms		–6.41	2.65	1
Neonates versus prey abundances and height of piles of palm leaves
Neonates vs. Var9+Snails	0.55	–11.59	0.0	1	0.83	0.43	0.92
Neonates vs. Var9+Snails+ Slugs		–11.49	–0.10	1
Neonates vs. Var9+Snails+ Slugs+Leeches		–10.55	–1.04	1
Neonates vs. Var9+Snails+ Slugs+Leeches+Earthworms		–8.65	–2.94