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Primary Production of Continental Shelf Waters Off New York

John H. Ryther and Charles S. Yentsch
Limnology and Oceanography
Vol. 3, No. 3 (Jul., 1958), pp. 327-335
Stable URL: http://www.jstor.org/stable/2832994
Page Count: 9
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Primary Production of Continental Shelf Waters Off New York
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Abstract

The chlorophyll-radiation method of measuring primary production, described earlier by the authors, was employed on six oceanographic cruises during 1956-7, each occupying 25 stations across the continental shelf off New York. The relationship photosynthesis/hour (opt. light): chlorophyll a, using the Oxygen production method, was found to agree with that determined earlier from culture and harbor water experiments, despite wide variations of temperature, nutrients, and the abundance of phytoplankton. The same ratio, with photosynthesis measured by $C^14$ uptake, was extremely variable and usually lower than that obtained by oxygen-production photosynthesis values. Estimates of daily production beneath a square meter of sea surface by the chlorophyll-radiation method and in situ $C^14$ values agreed within reasonable limits in 75% of the measurements; for the remainder of the times the $C^14$ values were consistently lower. Daily production throughout the year ranged roughly from $0.20 to 1.00 g carbon/m^2/day$ within the whole area studied. Estimated annual production decreased in a seaward direction from $160g carbon/m^2/year$ in the shallow coastal waters to $100 g carbon/m^2/year$ on the continental slope. These values are intermediate between Riley's estimates for Long Island Sound and the Sargasso Sea.

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