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Changes of phosphorus and nitrogen concentration and of phytoplankton in enriched lake enclosures 1
Author(s) -
Istvánovics Vera,
Vörös Lajos,
Herodek Sándor,
Tóth, László G.,
Tátrai István
Publication year - 1986
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1986.31.4.0798
Subject(s) - aphanizomenon , phytoplankton , biomass (ecology) , algae , phosphorus , nutrient , environmental science , environmental chemistry , enclosure , nitrogen , algal bloom , cyanobacteria , ecology , chemistry , anabaena , biology , genetics , telecommunications , organic chemistry , bacteria , computer science
Enclosures isolating 17 m 3 water with the underlying sediments in the mesotrophic area of Lake Balaton were used to simulate the main processes taking place in its hypertrophic area. In an enclosure with both P and N added the production and the biomass of phytoplankton increased immediately. Algae rapidly took up the added nutrients, transporting a third of the loadings from the water to the sediments and supplying a large amount of organic substrate for denitrification. As a result of N loss from the system, Aphanizomenon flos‐aquae formed a second bloom. In an enclosure with only N added the production and the biomass of algae remained similar to those in the open water. NO 3 − accumulated in the water for a long time. In an enclosure with only P added the algal production and biomass showed a moderate increase, followed by an outburst of A. flos‐aquae. PO 4 3− accumulated in the water during the first part of the experiment and was used up during the second.