An experimentally validated nitrate–ammonium–phytoplankton model including effects of starvation length and ammonium inhibition on nitrate uptake

Malerba, Martino E., Connolly, Sean R., and Heimann, Kirsten (2015) An experimentally validated nitrate–ammonium–phytoplankton model including effects of starvation length and ammonium inhibition on nitrate uptake. Ecological Modelling, 317. pp. 30-40.

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Abstract

Nitrate and ammonium are the two most important ionic forms of inorganic nitrogen driving biomassproduction in marine and freshwater aquatic systems. The performance of plants and algae often changeswhen reared with either of these two forms of nitrogen individually, as well as when they are both present,or when cells have experienced previous periods of nitrogen starvation. Current functional responsesquantifying how ambient nitrogen drives changes in population density are unable to capture interactingand transient effects of nitrate and ammonium. Hence, in this paper we formulate, calibrate, and testa new nitrate–ammonium quota model that accounts for nitrate and ammonium uptake, as well asthe effects of nitrogen starvation length and ammonium-induced nitrate uptake inhibition. We fit themodel with several time-series from the green alga Chlorella sp. reared in laboratory batch cultures under multiple initial conditions. We show that a single set of calibrated model parameters can capture time-series collected from experiments inoculated at 12 different initial concentrations of nitrate, ammonium,and biomass. The model also performed well when validated against time-series from two novel initial conditions withheld from model calibration. Our model therefore provides a framework for evaluating the potential broader ecological and environmental consequences of ambient nitrate and ammonium regimes for phytoplankton communities in nature and aquaculture.

Item ID: 40651
Item Type: Article (Refereed Research - C1)
Keywords: phytoplankton dynamics, quota model, nitrogen limitation, nitrogen starvation, ammonium inhibition, chlorophyta, aquaculture, bioproducts, biomass generation
ISSN: 1872-7026
Funders: AIMS@JCU, Australian Institute of Marine Science (AIMS), James Cook University (JCU), Advanced Manufacturing Cooperative Research Centre (AMCRC)
Projects and Grants: AMCRC Project 2.3.2
Date Deposited: 02 Mar 2016 23:50
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 30%
06 BIOLOGICAL SCIENCES > 0601 Biochemistry and Cell Biology > 060112 Structural Biology (incl Macromolecular Modelling) @ 50%
06 BIOLOGICAL SCIENCES > 0607 Plant Biology > 060701 Phycology (incl Marine Grasses) @ 20%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830199 Fisheries - Aquaculture not elsewhere classified @ 60%
96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960503 Ecosystem Assessment and Management of Coastal and Estuarine Environments @ 40%
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