Remarks on Surface Distribution of Marine Plankton Diatoms in the East Pacific

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Abstract
This paper summarizes completed statistical studies of surface catches of marine plankton diatoms made by the Scripps Inst. of Oceanography of the Univ. of California at La Jolla in a period of about 7 years. The territory covered extends along the eastern coast of the Pacific from Callao, Peru, to Dutch Harbor, Aleutian Islands, although most of the collections were taken between Lower California and Puget Sound. Some thousands of catches are included, all taken by dipping a certain quantity of water and filtering it through No. 25 bolting silk. The geographic area covered exceeds 7000 miles in extent and comprises more than 70[degree] of latitude and more than 90[degree] of longitude. Water temperatures encountered ranged from 39.4[degree]F. to 84.5[degree]F. The size of the catches ranged from 0 to nearly 7,000,000 diatom cells per liter, largest catches having been taken in Alaskan waters, though some large catches were obtained in subtropical and tropical areas. There is evidence that productivity and non-productivity may be strongly localized. In all regions production appears to be best in spring.

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