Comparative bioavailability of ammonium, nitrate, nitrite and urea to typically harmful cyanobacterium Microcystis aeruginosa. Issue 1 (15th September 2016)

• Record Type: Journal Article
• Authors: Li, Jihua; Zhang, Jibiao; Huang, Wei; Kong, Fanlong; Li, Yue; Xi, Min; Zheng, Zheng
• Is Part Of: Marine pollution bulletin. Volume 110:Issue 1(2016:Sep.)
• Page Start: 93
• Page End: 98
• Publication Date: 2016-09-15
• Subjects: Microcystis aeruginosa -- Nitrogen utilization -- Nitrate reductase -- Nitrite reductase -- Glutamine synthetase; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2016.06.077
• Languages: English
• ISSNs: 0025-326X

Abstract

Abstract: Phosphorus is generally considered as the prime limiting nutrient responsible for cyanobacterial blooms. However, recent research is drawing attention to the importance of bioavailable nitrogen (N) in freshwater eutrophication. This study investigated the bioavailability of NO3 − -N, NO2 − -N, NH4 + -N and Urea-N under different concentrations of 1.2, 3.6 and 6.0 mg L − 1 to Microcystis aeruginosa . Overall, Urea-N ranked the first in promoting M. aeruginosa growth, followed by NO3 − -N and NO2 − -N. However, the algal growth cultured in NH4 + -N was depressed under test N levels. The bioavailability of N to M. aeruginosa was seriously influenced by both N forms and N concentrations ( p < 0.01). Total N concentrations in Urea-N treatment decreased the fastest, which were corresponding with the μ values of M. aeruginosa . The high enzymic activities of nitrate reductase, nitrite reductase and glutamine synthetase indicated that the decomposition process for urea is effective, which contributed in N assimilation and utilization in M. aeruginosa cells. Highlights: We compare the bioavailability of different four N sources to M. aeruginosa The M. aeruginosa cells of N6.0 cultured in Urea-N grew fastest. Algal growth cultured in NH4 + -N was depressed when N concentration was ≥ 1.2 mg L − 1 .