Distribution of Hyperiid Amphipods off the Oregon Coast

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Abstract
A total of 19 species of hyperiid amphipods was collected from 1963 to 1967 off Oregon. Parathemisto pacifica, Paraphronima gracilis, Streetsia challengeri, Tryphana malmi, Hyperia medusarum, Hyperoche medusarum, and Primno macropa were common. New distributional records are reported for Scina crassicornis bermudensis and Lanceola loveni. Abundance and occurrence of common species are lower inshore than offshore suggesting centers of abundance are in offshore-oceanic waters. Yearly changes in occurrence and abundance of hyperiid amphipods inshore may be related to coastal upwelling. There was no evidence for vertical migrations or diel differences at depth intervals of 0–150 m and 150–450 m.

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