Abstract
A quantitative relationship between gross primary production and secondary production of aquatic upper level consumers was derived for the inshore portion of the Louisiana coastal zone. We estimate that 1,700 units of gross primary production are required to produce one unit of upper level consumers. Lower and mid-level consumers are estimated to require lesser amounts, 300 and 600 units, respectively. Harvested fishery groups in the inshore ecosystem represent a total average of about 23,000 metric tons (dry wt) or about 1.2×1011 Kcal (5.0×1011 KJ) annually. This harvest “costs” the system about 7×1013 Kcal (3.3×1014 KJ) of gross primary production, or an equivalent of 4×1014 Kcal (1.7×1015KJ) of fossil fuel.
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