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.

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.