trends in oceanographic conditions. The warm period was characterized by a community rich in equatorial, tropical/subtropical and warm-temperate cosmopolites, but almost lacking in subarctic copepods. The widespread presence of Undinula vulgaris appears to be due to the strong poleward jet that developed in the coastal region during autumn 1997. Although the coastal jet dispersed in early 1998, the strong influence of equatorial water continued, as indicated by the record abundance of Subeucalanus subtenuis, an equatorial species in oceanic eutrophic waters. The community during the cold period comprised very few copepods with equatorial affinity, few tropical/subtropical and warm-temperate cosmopolites, and an increased relative importance of subarctic species. Copepods typical for the California Current (transition zone group) displayed no significant differences between the extremes of El Niño/La Niña during the fall and winter seasons. A strong La Niña increase in the transition zone group (particularly in Calanus pacificus) was observed until spring 1999, and was probably related to a record coastal upwelling during the La Niña conditions at this time. El Niño 1997-1998 had a greater influence on equatorial species in the region than the previous El Niño event of 1957-1959.
Analizamos la respuesta del plancton a El Niño 1997-98 en la región sureña (26-32°N) de la Corriente de California, a partir de cuatro cruceros IMECOCAL. La clorofila a integrada en la vertical presentó un incremento moderado hacia el final del ENSO. No obstante la clorofila en Bahía Vizcaíno permaneció prácticamente constante (las medianas fueron superiores a 40 mg m-2 durante 1998). En contraste, la biomasa del zooplancton mostró una disminución desde Punta Baja (30°N) a Bahía Vizcaíno, pero no en otras áreas. La disminución de zooplancton en esta región fue debida principalmente a la baja abundancia de copépodos y eufáusidos, hacia el final del Niño. Valores de zooplancton relativamente altos en la región de Punta Eugenia (27.7°N) a San Ignacio (26.7°N), podrían ser explicados por la presencia de abundantes salpas. Una fuerte presencia de especies tropicales de copépodos fue observada durante el pico del Niño, siendo las más abundantes las oceánicas Nannocalanus minor y Eucalanus subtenuis. Las especies transicionales Calanus pacificus, Pleuromamma borealis y Rhincalanus nasutus tuvieron bajas abundancias.doi: sin doi
The Asiatic copepod, Pseudodiaptomus marinus is recorded for the first time in Todos Santos Bay, Baja California. The first specimens were collected near a newly constructed marina
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