Gross primary production organic matter

Gross primary production (GPP) is the total rate of photosynthesis including organic matter... 

Gross primary production the amount of carbon fixed (CO2 converted into organic matter) by photosynthetic organisms (per unit time per unit volume). 

Coral reef communities have also demonstrated the ability to take up suspended planktonic organic matter as a source of new carbon (Glynn, 1973 Johannes Gerber, 1974 Ayukai, 1995 Sebens etal., 1997 Fabricius etal., 1998 Ribes etal, 1998 Yahel etal., 1998). Reported rates of particulate carbon uptake are low (<40 mmol Cm-2 day-1) compared to rates of gross primary production and community respiration (Table 2.2), and have been demonstrated to be an unimportant source of carbon for some hard and soft coral communities (Ribes, 1998 submitted). However, the uptake of particulate organic matter may be an important source of food for some specific reef communities (Fabricius etal., 1998). 

Duursma E. K. (1963) The production of dissolved organic matter in the sea, as related to the primary gross production of organic matter. Neth. J. Sea Res. 2, 85—94. 

Equally problematic aire the estimates of primary production in terms of totail organic matter. Terms such as net and gross, new and regenerated production (Eppley and Peterson, 1979) are employed but their meamings are approximations derived from a series of mathematical equations with more unknowns than equations. 

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