The relationships between particulate and soluble alkaline phosphatase activities and the concentration of phosphorus dissolved in the seawater of Toulon Bay (NW Mediterranean).
The activities of particulate and soluble phosphatase were analyzed monthly for 1 year in the coastal ecosystems of the NW Mediterranean Sea. The mean contribution of the particulate activity increased from 56% at an MUF-P concentration of 30 μM to 77% at 0.04 μM. This particulate activity was negatively correlated with the DIP, DOP and TDP concentrations when the activities were related to the seawater volume, chlorophyll a or the protein concentration. The TDP correlations were highly significant (p: 0.001). The DOP correlations were significant (p: 0.04) and became highly significant (p: 0.009) at low DIP concentrations (<0.13 μM). The DIP correlations were significant (p: 0.04) only at low DOP concentrations (<0.18 μM). Thus, the effects of seawater DIP and DOP were found to be linked. The soluble activity exhibited distinct phosphatase fractions with high (0.5-29.5 μM) and low (0.02-2 μM) Km values, but none exhibited significant correlations with phosphorus compounds.
['Bogé|Gérard|G|', 'Lespilette|Magali|M|', 'Jamet|Dominique|D|', 'Jamet|Jean-Louis|JL|']
D000469:Alkaline Phosphatase D061006:Bays D002734:Chlorophyll D000077194:Chlorophyll A D017753:Ecosystem D004784:Environmental Monitoring D008522:Mediterranean Sea D010758:Phosphorus D012623:Seawater D014874:Water Pollutants, Chemical
Alkaline phosphatase Phosphorus Mediterranean Sea MUF-P DIP DOP TDP Kinetics MUF Methyl umbelliferyl phosphate Plankton SRP dissolved inorganic phosphorus dissolved organic phosphorus methylumbelliferone soluble reactive phosphorus total dissolved phosphorus