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Title: Alkaline phosphatase activity as a tool for assessing nutritional conditions in the seagrass Posidonia oceanica.(L.) Delile
Author: Invers i Brunet, Olga
Pérez Vallmitjana, Marta
Romero, Javier (Romero Martinengo)
Keywords: Fanerògames
Nutrients (Medi ambient)
Mediterrània, Mar
Nutrients (Ecology)
Mediterranean Sea
Issue Date: 1995
Publisher: Consejo Superior de Investigaciones Científicas (CSIC)
Abstract: The effects of experimental phosphorus enrichments on alkaline phosphatase activity (APA) of the seagrass Posidonia oceanica (L.) Delile were tested. Short-term additions (as phosphate, 12 hours, in the laboratory) decreased APA by 18-2896, depending on the plant part considered (roots, young leaves or old leaves). The values of APA after this treatment were well correlated with interna1 phosphorus pools (as P concentration in plant tissues). Long-term additions (as phosphate, added to the sediment, 1 month in situ) decreased APA by 40-75%, also depending on the plant part. We conclude that alkaline phosphatase activity is a good indicator of P deficiency in this seagrass. We used this indicator to assess the P-nutritional status in a series of meadows in the NW Mediterranean, finding a high geographical variability, but correlations between APA and basic features of the meadows (carbonate content of the sediment, organic content of the sediment, shoot density, etc.) were not significant. Consequently, phosphorus deficiency does not seem to be directly related to these descriptors.
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It is part of: Scientia Marina, 1995, vol. 59, num. Suppl. 1, p. 41-47
ISSN: 0214-8358
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

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