@article{PAR00015225,
  title = {{H}igh alkaline phosphatase activity in phosphate replete waters : the case of two macrotidal estuaries},
  author = {{L}abry, {C}. and {D}elmas, {D}. and {Y}ouenou, {A}. and {Q}uere, {J}. and {L}eynaert, {A}. and {F}raisse, {S}. and {R}aimonet, {M}. and {R}agueneau, {O}livier},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he occurrence of alkaline phosphatase activity ({APA}) that hydrolyses organic phosphorus into phosphate ({PO}4) is commonly related to {PO}4 deficiency of oceanic, coastal and fresh waters. {APA} is almost never investigated in {PO}4-rich estuaries, since very low activities are expected to occur. {A}s a consequence, microbial mineralization of organic phosphorus into {PO}4 has often been ignored in estuaries. {I}n this study, we examined the importance of potential {APA} and the associated microbial dynamics in two estuaries, the {A}ulne and the {E}lorn ({N}orthwestern {F}rance), presenting two different levels of {PO}4 concentrations. {U}nexpected high potential {APA} was observed in both estuaries. {V}alues ranged from 50 to 506 nmol {L}-1 h(-1), which range is usually found in very phosphorus-limited environments. {H}igh potential {APA} values were observed in the oligohaline zone (salinity 5-15) in spring and summer, corresponding to a {PO}4 peak and a maximum bacterial production of particle-attached bacteria. {I}n all cases, high potential {APA} was associated with high suspended particulate matter and total particulate phosphorus. {T}he low contribution of the 0.2-1 mu m fraction to total {APA}, the strong correlation between particulate {APA} and bacterial biomass, and the close relationship between the production of particle-attached bacteria and {APA}, suggested that high potential {APA} is mainly due to particle-attached bacteria. {T}hese results suggest that the microbial mineralization of organic phosphorus may contribute to an estuarine {PO}4 production in spring and summer besides physicochemical processes.},
  keywords = {{FRANCE}},
  booktitle = {},
  journal = {{L}imnology and {O}ceanography},
  volume = {61},
  numero = {4},
  pages = {1513--1529},
  ISSN = {0024-3590},
  year = {2016},
  DOI = {10.1002/lno.10315},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00015225},
}