Dynamics of nitrogen-fixing cyanobacteria with heterocysts: a stoichiometric model
James P. Grover A G , J. Thad Scott B C , Daniel L. Roelke D E and Bryan W. Brooks B F
+ Author Affiliations
- Author Affiliations
A University of Texas at Arlington, Biology Department, Box 19498, Arlington, TX 76019, USA.
B Baylor University, Center for Reservoir and Aquatic Systems Research, One Bear Place 97178, Waco, TX 76798, USA.
C Baylor University, Biology Department, One Bear Place 97388, Waco, TX 76798, USA.
D Texas A&M University—Galveston, Marine Biology Department, PO Box 1675, Galveston, TX 77553, USA.
E Texas A&M University, Oceanography Department, College Station, TX 77843, USA.
F Baylor University, Environmental Science Department, One Bear Place 97266, Waco, TX 76798, USA.
G Corresponding author. Email: grover@uta.edu
Marine and Freshwater Research 71(5) 644-658 https://doi.org/10.1071/MF18361
Submitted: 18 September 2018 Accepted: 15 April 2019 Published: 6 August 2019
Abstract
A simulation model for nitrogen-fixing cyanobacteria was formulated to predict population and nutrient dynamics in water quality studies. The model tracks population biomasses of nitrogen and phosphorus, which potentially limit population growth. Lack of intracellular nitrogen cues the differentiation of specialised heterocysts for nitrogen fixation. Ecoevolutionary analysis presented here predicts that natural selection optimises heterocyst differentiation in relation to external supplies of nitrogen and phosphorus. Modelling the production of N-rich toxins (e.g. anatoxins, saxitoxins) suggests that both total biomass and the biomass N : P ratio can predict concentrations of toxins. The results suggest hypotheses that major taxa of nitrogen-fixing, nuisance cyanobacteria are differentially adapted to varying nitrogen and phosphorus supplies, and that biomass stoichiometry is related to toxins production in this major group of harmful algae. This approach can be extended into models of community and ecosystem dynamics to explore implications of nitrogen fixation for cyanobacterial biomass and toxins production.
Additional keywords: algal blooms, blue–green algae, cyanotoxins, Droop model, eutrophication, nutrient limitation, variable internal stores model.
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