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标题：Modelling an Artificial Microalgae-Cyanobacteria Ecosystem
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作者：Margaux Caia ; Olivier Bernard ; Jean-Philippe Steyer 等
期刊名称：IFAC PapersOnLine
印刷版ISSN：2405-8963
出版年度：2018
卷号：51
期号：2
页码：655-660
DOI：10.1016/j.ifacol.2018.03.111
语种：English
出版社：Elsevier
摘要：AbstractMicroalgae based processes have been actively studied in the last decades with perspective for food, feed, and source of chemicals such as biofuels. Most of the developments focused on monospecific culture of microalgae, with dedicated practices to avoid any contaminations. However, interactions between microalgae and bacteria are likely to enhance microalgae growth, provide more resilience to external changes and eventually limit external contaminations. But interactions within these natural ecosystems are still poorly understood and are affected by the environment. A photosynthetic marine ecosystem composed of the microalgaeDunaliella salinaand the nitrogen fixing cyanobacteriaCrocosphaera watsoniiwas therefore studied. A model was designed to represent the competition for light and the interactions with nitrogen between these two microorganisms. An allelopathic effect was noticed and a toxin production byC. watsoniiwas assumed and included in the model. Calibration was carried out with experimental data where cell densities and nitrate concentrations were measured. The predictions of the mathematical model accurately represented the experimental data. The model therefore highlighted the interactions within this artificial ecosystem. The model confirms thatD. salinagrowth was limited by nitrate concentration and did not consume dissolved organic nitrogen produced byC. watsoniifrom its diazotrophic activity.D. salinaandC. watsoniiwere competing for light, which favoredD. salinaand limitedC. watsoniiwhen grown in cocultures. The model supports the hypothesis thatC. watsoniiproduced toxins enhancingD. salinamortality in the cocultures.
关键词：KeywordsInteractionsEnvironmental engineeringEcologyModellingBiotechnologyCrocosphaera watsoniiDunaliella salinaDiazotrophyNitrogen fixationAllelopathy