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Kinetic parameters and organic phosphorus remineralization potential of alkaline phosphatase activity in the tropical seagrass Thalassia testudinum and associated epiphyton.

  • Biology
  • Ecology.
  • Biogeochemistry.


Seasonal APA of the seagrass Thalassia testudinum and its epiphytic community was measured in NE Florida Bay. APA was higher for T. testudinum leaves with intact epiphytes (TTE) than for T. testudinum leaves alone (TT) in all seasons, and the spring growing season elicited the highest activities. Based on in situ PME levels (0.117--0.387muM), AP'ase P-remineralization rates were 0.326--2.181 for TTE and 0.237--0.823 for TT (mumol g-1 AFDW day-1), representing 26% and 4% of P-uptake, respectively. Therefore, APA may be an important P source to the seagrass-epiphyte consortium in tropical carbonate estuaries.

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