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Community composition of fish larvae was analyzed from samples collected in zooplankton oblique-tows off the Baja California Peninsula between January 1998 and October 2000. Community diversity and equitability was estimated with Shannon’s Index and Olmstead-Tukey test was used to determine dominant taxa from each sampling period. El Niño and La Niña conditions were reflected in the taxa composition during 1998 and 1999 respectively. El Niño event is represented during 1998 by the higher abundances of tropical taxa larvae. In 1999 temperate-transitional taxa larvae were the most abundant during winter and spring and the most diverse year round. During winter and spring 2000 temperate-transitional taxa larvae were the most abundant and during summer and fall tropical and temperate-transitional taxa larvae contributed with similar abundances. In terms of fish larvae abundances and composition El Niño event seams to be more notable than La Niña event, which can be in part shadowed by the normal dominance of temperate-transitional taxa year round, but is registered in the more than usual higher abundances of larvae of opportunistic species like Engraulis mordax, and by the rare presence of some sub-artic taxa larvae.

Palabras clave: valoración económica; variabilidad climática; IMECOCAL

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