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A Phytoplankton Bloom in Shallow Divor Reservoir (Portugal)—The Importance of Internal Nutrient Loading
Author(s) -
Cabeçadas Graça,
Brogueira Maria J.,
Windolf Jörgen
Publication year - 1986
Publication title -
internationale revue der gesamten hydrobiologie und hydrographie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 0020-9309
DOI - 10.1002/iroh.19860710606
Subject(s) - phytoplankton , bloom , turbidity , nutrient , algal bloom , sediment , environmental science , phosphate , oceanography , environmental chemistry , hydrology (agriculture) , geology , chemistry , ecology , biology , geomorphology , geotechnical engineering , organic chemistry
The development of a heavy phytoplankton bloom (chl. a = 360 mg/m 3 ), which occurred in the summer 1983 in a shallow reservoir, Divor, is described. The study shows that remobilization of phosphate from the sediment was initiating the phytoplankton bloom. This was confirmed not only by calculations of the change in iron‐phosphate pool, but also supported by sorption experiments carried out with the sediment. It is discussed that turbidity of the water due to suspended matter caused the reduction in standing stock of phytoplankton to approx. 50 mg chl. a /m 3 in late summer.