Table 2. Changes in fish biomass between 1999 and 2009 in (a) Cabo Pulmo National Park, (b) other no-take or core zones, and (c) open-access areas.

		TopPredators	Carnivores	Zooplanktivores	Herbivores	Total
Cabo Pulmo	F	+
	t	+	+	+	+	+
	U	+	+		+	+
	ρ	0.25	0.16	0.12	0.16	0.17
Core zones	F				+
	t
	U
	ρ	0.005	0.005	0.03	−0.01	0.003
Open access	F
	t
	U
	ρ	−0.03	0.009	−0.01	−0.03	−0.01

Rows indicate the test used or parameter measured (F for Fisher's equality of variances test; t for Student's t-test for unequal sample sizes and unequal variances; U for Mann-Whitney's rank-sum test, and ρ for the rate of change). Plus signs (+) indicate a significant increase in biomass variance (F), in mean biomass (t), or in ranked biomass (U); blank spaces indicate non-significant changes.