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The marine iguana (Amblyrhynchus cristatus Bell, 1825) is an endemic species in Galapagos that forages in the sea (Bartholomew & Vleck, 1979). Scientific studies of marine iguanas have shown that El Nino Southern Oscillation events (ENSO) produce negative impacts on the fauna of the isles (Wikelski & Corinna, 2000; Romero & Wikelski, 2001) and in 1997 the Charles Darwin Foundation (CDF) established a permanent sampling site in southern Santa Cruz Island, between Punta Nunez and the CDF dock, to obtain scientific information and extrapolate it to understand the effect of El Nino on other marine iguana populations of the archipelago and their recuperation in succeeding years. Abundance was recorded along a 6.1 km transect divided into sections of 100 m (61 sections) on one day each month. ANOVA and Student’s t-tests were used to compare abundance in El Nino (1997-98) and La Nina years (2001-2002), using only data from the second six months of each year; they differed significantly (t= 4.349, P 0.44), while in juveniles the difference is significant, indicating population recuperation in La Nina (t= 7.337; P<0.0004). The results indicate that marine iguanas, after an El Nino event, take about 4 years to recover.

ABUNDANCIA DE Amblyrhynchus cristatus EN EL NIÑO (97-98) Y LA NIÑA (01-02) EN SANTA CRUZ, GALÁPAGOS