Dissolved Nitrogen Uptake by a Cyanobacterial Bloom ( Anabaena flos-aquae ) in a Subarctic Lake

Author:

Gu Binhe1,Alexander Vera1

Affiliation:

1. Institute of Marine Science, School of Fisheries and Ocean Sciences, University of Alaska at Fairbanks, Fairbanks, Alaska 99775-1080

Abstract

Uptake of dissolved nitrogen (NH 4 + + NO 3 - + urea + N 2 ) by a cyanobacterial [ Anabaena flos-aquae (Lyngb.)] De Brèb population in Smith Lake, Alaska, was measured every 2 to 4 days during the spring of 1990. Total dissolved nitrogen uptake ranged from 0.34 to 24.75 μmol liter -1 h -1 , with a mean of 5.75 μmol liter -1 h -1 ; the euphotic zone accounted for 91% of the uptake. The mean turnover time for dissolved combined nitrogen (NH 4 + + NO 3 - + urea) in the euphotic zone was less than 14 h, and that for NH 4 + was only 3.6 h. The mean relative preference indices for NH 4 + (2.4), NO 3 - (0.4), and urea (0.5) established NH 4 + as the preferred nitrogenous nutrient. The uptake rates were apparently dependent on biomass, temperature, and light. Regeneration, probably due to zooplankton excretion and bacterial remineralization of dissolved organic nitrogen, was the main source of NH 4 + for the cyanobacterial growth. The high half-saturation constant for NH 4 + with low ambient NH 4 + concentration nevertheless resulted in the simultaneous utilization of several forms of nitrogen.

Publisher

American Society for Microbiology

Subject

Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology

Reference62 articles.

1. Alexander V. 1970. Relationships between turnover rates in the biological nitrogen cycle and algal productivity p. 37-50. In D. W. Hood (ed.) Dynamics of the nitrogen cycle in lakes. Institute of Marine Science University of Alaska Fairbanks.

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3. The importance of regenerated nitrogen to phytoplankton productivity in a subalpine lake;Axler R. P.;Ecology,1981

4. The characteristics of ammonium and nitrate uptake by phytoplankton in Lake Kinneret;Berman T.;Limnol. Oceanogr.,1984

5. Nitrogen fixation and the utilization of other inorganic nitrogen sources in a subarctic lake;Billaud V. A.;J. Fish. Res. Board Can.,1968

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