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A Quantitative Analysis of Alkaline Phosphatase Activity in He‘eia Fishpond

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Title:A Quantitative Analysis of Alkaline Phosphatase Activity in He‘eia Fishpond
Authors:Hull, Danielle
Contributors:Ruttenberg, Kathleen (advisor)
Oceanography (department)
Global Environmental Science (department)
Keywords:chemical oceanography
biological oceanography
Date Issued:2010
Publisher:University of Hawaiʻi at Mānoa
Place of Publication:Honolulu
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.
Pages/Duration:77 pages
Rights:All UHM dissertations and theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission from the copyright owner.
Rights Holder:Hull, Danielle
Appears in Collections: Global Environmental Science Theses

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