. Carbon and the biosphere; proceedings of the 24th Brookhaven symposium in biology, Upton, , May 16-18, 1972. Carbon cycle (Biogeochemistry). 234 WOODWELL, RICH, AND HALL x H a. LU Q. 6 5 4 3 2 1 TIME, 103 years before the present Fig. 5 Relationship between age and depth of high marsh peat at Barnstable, Mass. (Alfred C. Redfield, Estuaries, p. 113, American Association for the Advancement of Science, Washington, 1967.) accumulate probably approximates the rate of net productivity. The import of fixed C from uplands and from the coastal ocean might increase the rate locally above the net
. Carbon and the biosphere; proceedings of the 24th Brookhaven symposium in biology, Upton, , May 16-18, 1972. Carbon cycle (Biogeochemistry). 234 WOODWELL, RICH, AND HALL x H a. LU Q. 6 5 4 3 2 1 TIME, 103 years before the present Fig. 5 Relationship between age and depth of high marsh peat at Barnstable, Mass. (Alfred C. Redfield, Estuaries, p. 113, American Association for the Advancement of Science, Washington, 1967.) accumulate probably approximates the rate of net productivity. The import of fixed C from uplands and from the coastal ocean might increase the rate locally above the net production under extraordinary circumstances. Fisheries The fish populations of estuaries are higher than those of freshwater bodies and commonly higher (sometimes 1000 times) than in other coastal waters (Fig. 6). Standing crops in segments of Flax Pond occasionally exceed 100 g (dry weight)/m2. Productivity of fish in estuaries often ranges from 5 to 15 g (dry weight) m 2 year"1 and is probably the highest of any water bodies. (Dry weight of fish is approximately 20% of wet weight.) The total contribution of estuaries to oceanic fisheries has been 2 '20 Of the estimated 3 X 106 metric tons of fish and shellfish caught in western Atlantic continental shelf waters, about two-thirds are from species believed to be estuarine dependent at some stage in their life history. Stroud21 calculated that each hectare of estuary contributes more than 550 kg fish each year to coastal fisheries, either directly or by serving as nursery grounds for the young of fish captured offshore. The. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Brookhaven National Laboratory; Woodwell, G. M; Pecan, Erene V. [Washington] Technical Information Center, U. S. Atomic Energy Commission; [available from National Techni
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