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摘要
Se analiz車 la distribuci車n espacio-temporal de los euf芍usidos colectados en cuatro cruceros estacionales realizados frente a la costa de Concepci車n en 1991. Se identificaron ocho especies, Euphausia mucronata, E. vallentini, Nyctiphanes simplex, Nematoscelis megalops, Nematobrachion flexipes, Stylocheiron longicorne, S. affine y S. suhmii. La mayor赤a de las especies hab赤a sido registrada en aguas del Pac赤fico suroriental, a excepci車n de S. suhmii, que se distribuye com迆nmente en el Pac赤fico central. La presencia de S. suhmii constituye su primer registro en el Sistema de la Corriente de Humboldt. Del total de especies, E. mucronata (76%) y N. simplex (23%) fueron las m芍s abundantes y frecuentes. Los euf芍usidos se registraron en todos los periodos del a o, aunque con fluctuaciones estacionales y espaciales asociadas a las caracter赤sticas oceanogr芍ficas del 芍rea de estudio. Los m芍ximos estacionales se determinaron en oto o y los m赤nimos en invierno, presentando diferencias significativas en su distribuci車n espacial. Se encontr車 una relaci車n inversa entre la abundancia de E. mucronata y la concentraci車n de ox赤geno disuelto, asociada a eventos de surgencia costera Spatial and temporal distribution of euphausiids collected in four seasonal cruises of Concepci車n in 1991 was analyzed. Eight species of euphausiids were identified, Euphausia mucronata, E. vallentini, Nyctiphanes simplex, Nematoscelis megalops, Nematobrachion flexipes, Stylocheiron longicorne, S. affine and S. suhmii. Most species have been previously recorded in the Southeastern Pacific Ocean, with exception of S. suhmii, that is commonly distributed in the Central Pacific Ocean. The presence of S. suhmii constitutes the first record for the Humboldt Current System. The most abundant and frequent species were E. mucronata (76%) and N. simplex (23%). The euphausiids were collected in different seasons of the year, even though they show seasonal and spatial fluctuations associated to the oceanographic conditions. The seasonal maximum was determinate in autumn and the minimum in winter. Significant differences between the different oceanographic sections were found. Besides, an inverse relationship between the abundance of E. mucronata and the dissolved oxygen concentration was found, associated to coastal upwelling events
