ISSN:
1573-5117
Keywords:
reservoir
;
phytoplankton
;
bacteria
;
alkaline phosphatase activity
;
diel
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The diel changes of the size fractioned alkaline phosphatase activity (APA) were studied in relation to several abiotic and biotic factors in Villerest reservoir (located on the Loire river, near the city of Roanne, France), bihourly during two days in July 1992. The APA measured in this work exceeded considerably those reported in the literature, suggesting that dissolved mineral phosphorus was not available to microorganisms. At 1 m, the APA was primarily due to bacteria which actively assimilated organic P compounds released by photosynthetic algal metabolism. At 5, 10 and 20 m, the APA was predominantly algal. The high concentrations in SRP (soluble reactive phosphorus) would indicate that orthophosphates were not bioavailable. The reverse (i. e availability to phytoplankton) would have resulted in undetectable levels of P-PO inf4 sup3− due to the massive proliferation of algae in Villerest reservoir.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00024447
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