Why does the relationship between sinking flux and planktonic primary production differ between lakes and oceans?
Stephen B. Baines1, Michael L. Pace2 and David M. Karl3 1Institute of Ecosystem Studies, New York Botanical Garden, Box AB, Millbrook 12545-0129 and Department of Botany, Yale University, Osborne Memorial Laboratory, New Haven, Connecticut 06511 2Institute of Ecosystem Studies, New York Botanical Garden 3School of Ocean and Earth Science and Technology, Department of Oceanography, University of Hawaii at Manoa, Honolulu 96822 Abstract The fraction of primary production lost to sinking (the export ratio) increases with productivity in the ocean and decreases slightly with productivity in lakes. To explore why this distinction exists, we compared marine and freshwater regressions relating Chlorophyll concentrations in the euphotic zone to each of the three variables that define the export ratio: primary productivity, carbon sinking fluxes, and euphotic zone depth. Chlorophyll was found to predict these three variables well (r2 = 0.54-0.90) in both lakes and the ocean. The differences bet
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- Why does the relationship between sinking flux and planktonic primary production differ between lakes and oceans?
