TABLE 2.

Generalized additive model (GAM) results.

Treatment	Intercept	Nitrate concentration		GCV	r2 (adj.)	Deviance explained (%)
	Estimate ± SE	edf	p-value
12°C	7.36 ± 11.64	3.391	<0.001	3725.9	0.684	73.5
18°C	–24.412 ± 8.522	3.883	0.003	2324.7	0.434	52.2
24°C	0.582 ± 5.530	2.036	0.030	840.22	0.279	34.3
Joined model (three temperatures)	–6.373 ± 6.618	3.769	<0.001	3376.7	0.298	33.5

Intercept (estimate ± standard error), estimated degrees of freedom (edf), and significance (p-value) of nitrate concentration for the competition coefficient α under different temperatures. GCV, generalized cross-validation.