Geographic Distribution and Relative Abundance of Salpidae off the Oregon Coast

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Abstract
Six species of salps were identified from 437 midwater trawl and 202 plankton net collections off Oregon from 1961 to 1964: Helicosalpa virgula, Iasis zonaria, Salpa fusiformis, Pegea confoederata, Thalia democratica, and Thetys vagina. Relative abundance of the species varied in time and space and few distributional patterns were evident. Salpa fusiformis and I. zonaria, the most common species, were found during all seasons of the year, the highest numbers usually during the summer, the upwelling season. Thalia democratica, H. virgula, and T. vagina were found only during 1963, and P. confoederata was most common during 1963. This was an abnormally warm year and the presence of these species off Oregon may have been related to advection from the south or west and the lack of upwelling.

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