(A) Annual variation in bioyear (July–June) precipitation at Palomarin during the study period. Reference line indicates the average bioyear rainfall from 1966 to 2000. (B) Annual variation in the mean monthly Southern Oscillation Index (SOI) for the period October–April. (C) Annual variation in number of territories established on the study area over 21 years. Solid line is the best least-squares fit to the data