Seasonal Settlement of Polychaetous Annelids on Test Panels in Los Angeles–Long Beach Harbors 1950–1951

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Abstract
Twenty-four species of polychaetes settled on test blocks suspended at 13 stations in Los Angeles–Long Beach harbors in 1950–51. Polydora limicola, Capitella capitata, and Hydroides pacificus were the three most frequently occurring species. Although a peak in settling occurred during the spring months, in general, the warmer the water, the greater the number of species present. However, H. pacificus possessed a summer-full peak, and C. capitata exhibited no apparent peak. Many of the species reproduced throughout the year, as indicated by settlement data. A suppression in the number of species was observed whenever the dissolved oxygen concentration was below 4.0 mg/liter.

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