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Primary Productivity And Nitrogen-Fixation In 2 Macroalgae-Cyanobacteria Associations, Pa Penhale, Dg Capone
Primary Productivity And Nitrogen-Fixation In 2 Macroalgae-Cyanobacteria Associations, Pa Penhale, Dg Capone
VIMS Articles
Primary productivity and nitrogen fixation (acetylene reduction) were estimated in two macroalgae-cyanobacteria associations from coral reef communities. Microdictyon sp., collected at 20 m on the reef proper and Laurencia sp., from 1-2 m on an inshore sand flat, showed high productivity rates: 1.15 and 1.90 mg C g-l h-I, respectively. Dissolved organic carbon excretion for both associations was less than 0.5% of the total carbon fixed. Nitrogenase activity was much higher in the Laurencia association than in the Microdictyofl association (9,61 vs, 1.04 f.Lg N g-l h-1); this probably was due to differences in the cyanobacterial epiflora, The effect of …
Nitrate-Rich Groundwater Inputs To Discovery Bay, Jamaica - A Significant Source Of N To Local Coral Reefs, Ce D'Elia, Kl Webb, Jw Porter
Nitrate-Rich Groundwater Inputs To Discovery Bay, Jamaica - A Significant Source Of N To Local Coral Reefs, Ce D'Elia, Kl Webb, Jw Porter
VIMS Articles
The freshwater aquifer at Discovery Bay, Jamaica, produces subterranean springs and seeps near the reef at the mouth and along the southern and western shorelines of the bay. A strong inverse correlation exists between salinity and N concentration. Undiluted springwater typically contains 80 J.Lg at N per liter or more, primarily as nitrate, but is essentially devoid of P. Input from the springs is enough to reduce the salinity by one to several parts per thousand near these sites and appears to produce a significant enrichment of nitrogen to the bay.