The effect of pre-industrial and predicted atmospheric CO2 concentrations on the development of diazotrophic and non-diazotrophic cyanobacterium: Dolichospermum circinale and Microcystis aeruginosa |
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| Affiliation: | 1. Center for Coastal Studies, Texas A&M University-Corpus Christi, 6300 Ocean Dr., Corpus Christi, TX 78412,USA;2. United States Food and Drug Administration, Center for Food Safety and Applied Nutrition, 5001 Campus Drive, College Park, MD 20740,USA;3. Department of Plant and Environmental Sciences, New Mexico State University, 1780 E University Ave, Las Cruces, NM 88003,USA;4. School of Marine and Atmospheric Science, Stony Brook University, 100 Nicolls Rd, Stony Brook, NY 11794,USA;5. Department of Biology, John Carroll University, 1 John Carroll Blvd, University Heights, OH 44118,USA;6. Department of Botany, Faculty of Sciences, University of South Bohemia, Branišovská 31, České Budějovice 37005, Czechia,USA;7. Center for Applied Aquatic Ecology, North Carolina State University, Raleigh, NC 27695,USA;8. Agilent Technologies Inc., 1834 TX-71 W, Cedar Creek, TX 78612,USA;9. PVZimba, Inc., 12241 Percival St, Chester, VA 23831, USA;1. Pharmaceutical Biotechnology Lab, School of Biology and Center of Excellence in Phylogeny of Living Organisms, College of Science, University of Tehran, Tehran 1417864411, Iran;2. Energy and environmental sustainability for megacities (E2S2), NUS Environmental Research Institute (NERI), Campus for Research Excellence and Technological Enterprise (CREATE), 1 Create Way, 138602 Singapore;3. Department of Civil & Environmental Engineering, National University of Singapore, Blk E1A-07-03, 1 Engineering 2, Singapore 117576, Singapore |
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| Abstract: | Photoautotrophs are capable of consuming high quantities of CO2, yet scant research exists examining the influence of different CO2 concentrations on the growth of freshwater diazotrophic or non-diazotrophic cyanobacteria. In this study, we cultured two cyanobacteria taxa (Dolichospermum circinale and Microcystis aeruginosa) within controlled atmospheric CO2 chambers at pre-industrial, and post-industrial concentrations. Biovolume and chlorophyll a (Chl-a) differed as a consequence of the adjusted CO2 gradients. Significantly higher biovolume measurements were observed in the elevated CO2 treatment for the diazotrophic species in the initial experiment. However, a follow-up experiment, with a corrected culture replenishment regime showed Chl-a measurements were greater for the diazotrophic and non-diazotrophic species in the elevated CO2 treatment. Increasing CO2 presents a risk to already compromised eutrophic and hyper-eutrophic ecosystems, and we reason increasing CO2 concentrations could affect photosynthetic performance and CO2 assimilation of surface dwelling cyanobacteria. Further experimental work is required to establish ecological thresholds for freshwater ecosystems, as pH levels showed a measurable reduction within the elevated CO2 treatments. As cyanobacteria species may respond quite differently to future CO2 concentrations similar comparative studies should be carried out that focus on CO2 dynamics and pH. The findings of the study indicate diazotrophic cyanobacteria growth in particular may benefit from elevated atmospheric CO2 concentrations. |
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| Keywords: | Diazotrophic Non-diazotrophic freshwater cyanobacteria |
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