Quantifying nutrient throughput and DOM production by algae in continuous culture
| Autor: | David Talmy, Zoe V. Finkel, Michael J. Follows, Justin D. Liefer, Daniel Sher, Keisuke Inomura, Anne Willem Omta, Andrew J. Irwin |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Statistics and Probability Nitrogen chemistry.chemical_element Biomass Chemostat Models Biological General Biochemistry Genetics and Molecular Biology 03 medical and health sciences 0302 clinical medicine Nutrient Algae Chlorophyta Dissolved organic carbon General Immunology and Microbiology biology Applied Mathematics Phosphorus Nutrients General Medicine biology.organism_classification 6. Clean water Dilution 030104 developmental biology chemistry Modeling and Simulation Environmental chemistry General Agricultural and Biological Sciences 030217 neurology & neurosurgery |
| Zdroj: | Elsevier |
| Popis: | Freshwater and marine algae can balance nutrient demand and availability by regulating uptake, accumulation and exudation. To obtain insight into these processes under nitrogen (N) and phosphorus (P) limitation, we reanalyze published data from continuous cultures of the chlorophyte Selenastrum minutum. Based on mass budgets, we argue that much of the non‐limiting N and P had passed through the organisms and was present as dissolved organic phosphorus or nitrogen (DOP or DON). We construct a model that describes the production of biomass and dissolved organic matter (DOM) as a function of the growth rate. A fit of this model against the chemostat data suggests a high turnover of the non‐limiting N and P: at the highest growth rates, N and P atoms spent on average only about 3 h inside an organism, before they were exuded as DON and DOP, respectively. This DOM exudation can explain the observed trends in the algal stoichiometric ratios as a function of the dilution rate. We discuss independent evidence from isotope experiments for this apparently wasteful behavior and we suggest experiments to quantify and characterize DON and DOP exudation further. |
| Databáze: | OpenAIRE |
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