A Quantitative Analysis of Alkaline Phosphatase Activity in He‘eia Fishpond
Date
2010
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Abstract
Dissolved organic phosphorus (DOP) is a potentially significant source of
bioavailable P to primary producers in aquatic systems. The presence of the
alkaline phosphatase (APase) enzyme indicates inorganic P deficiency and
the potential for utilization of the DOP pool. Seasonal and spatial variability
of alkaline phosphatase activity (APA) was quantified in He‘eia Fishpond, a
coastal brackish-water pond adjacent to Kaneohe Bay, Hawaii. Whole
community APA (> 0.7 µm), normalized to chlorophyll a, revealed changes in
APA in concert with varying nutrient inventories and ratios. Specifically, we
observed elevated dissolved organic nitrogen to phosphate ratios (DIN:DIP)
following a major storm event, accompanied by elevated APA and alterations
in phytoplankton community. Taken together, these data suggest that storm
pulses of fluvial material into the coastal ocean can significantly perturb the
resident phytoplankton community. Ultimately, investigating the potential
bioavailability of DOP increases our understanding of controls on primary
production and phytoplankton community structure.
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chemical oceanography, biological oceanography
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77 pages
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