Abstract
Large improvements in biomass and lipid production are required to make massive scale algal biodiesel production an economic reality. The application of the biodiversity strategy to enhance algal biomass as biofuel feedstock is little. The algal diversity was manipulated in this study to investigate the effects of a combination of biodiversity complementarity and a new medium consisting of seawater and agricultural fertilizer on lipid productivity. The algae diverse community includes two strains of Dunaliella salina (Dunaliella salina 19/30 and 19/18) and three species of Nannochloropsis (Nannochloropsis oculata, Nannochloropsis salina, and Nannochloropsis gaditana). The results showed that the most diverse community (5 species) produced an average of sixfold more biomass in the new medium than did the standard f/2 culture medium. The most diverse polyculture had the highest growth rate (1.01 day−1), biomass (1.2 g L−1), and lipid productivity (0.31 g L−1 day−1). The assessment of algal polycultures relative to monocultures is particularly interesting and novel for this biofuel field, and the observations that these polycultures resulted in significant lipid productivity improvements are very useful addition to the biofuel research. The possible mechanism (resource diversity) to explain the synergy in mixed cultures warrants further investigation.
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Acknowledgments
The author would like to thank the China Scholarship Council (CSC) and Carbon Trust (UK) for supporting this research financially and thank Professor Steve Wilkinson for writing assistance, Dr. Jim Gilmour and Dr. Krys Bangert for laboratory assistance and very helpful suggestions.
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Liu, J. Interspecific biodiversity enhances biomass and lipid productivity of microalgae as biofuel feedstock. J Appl Phycol 28, 25–33 (2016). https://doi.org/10.1007/s10811-015-0535-3
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DOI: https://doi.org/10.1007/s10811-015-0535-3