Table 1. Results of nested ANOVA of the effects of Region (north and south of Punta Lengua de Vaca, fixed factor) and Site (Panul, Guanaqueros, Limarí, or Punta Talca; random factor and nested within Region) on stability, species synchrony, species dominance, statistical averaging, and overyielding.

	Region (1)			Site(Region) (2)			Residual (36)	Pooled residual (38)
Source of variation	MS	F		MS	F		MS	MS	MS denominator
Response variable
Stability	0.78	19.03	***	0.06	1.42		0.040	0.041	Pooled
Mean total cover	2284.63	8.27	**	166.40	0.59		282.455	276.347	Pooled
Std. dev. total cover	1009.08	13.03	**	144.22	1.96		73.733	77.442	Pooled
Species synchrony	3.54	21.82	***	0.19	1.16		0.161	0.162	Pooled
Dominance	0.43	8.73		0.05	8.32	**	0.006		Site(Region)
Statistical averaging	0.12	0.53		0.22	6.56	**	0.034		Site(Region)
Overyielding	0.76	0.89		0.85	4.10	**	19.930	19.056	Pooled

Degrees of freedom are in brackets. Error terms with highly conservative P-values (≥0.25) were removed from the model and the F-ratio for Region was recalculated with a pooled residual. Error terms used as denominator for each F-ratio are given in MS _denominator.

^** = P<0.05;

^*** = P<0.001.