Decreased motility of flagellated microalgae long-term acclimated to CO2-induced acidified waters

Yitao Wang, Xiao Fan, Guang Gao, John Beardall, Kazuo Inaba, Jason M. Hall-Spencer, Dong Xu, Xiaowen Zhang, Wentao Han, Andrew McMinn, Naihao Ye

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

Motility plays a critical role in algal survival and reproduction, with implications for aquatic ecosystem stability. However, the effect of elevated CO2 on marine, brackish and freshwater algal motility is unclear. Here we show, using laboratory microscale and field mesoscale experiments, that three typical phytoplankton species had decreased motility with increased CO2. Polar marine Microglena sp., euryhaline Dunaliella salina and freshwater Chlamydomonas reinhardtii were grown under different CO2 concentrations for 5 years. Long-term acclimated Microglena sp. showed substantially decreased photo-responses in all treatments, with a photophobic reaction affecting intracellular calcium concentration. Genes regulating flagellar movement were significantly downregulated (P < 0.05), alongside a significant increase in gene expression for flagellar shedding (P < 0.05). D. salina and C. reinhardtii showed similar results, suggesting that motility changes are common across flagellated species. As the flagella structure and bending mechanism are conserved from unicellular organisms to vertebrates, these results suggest that increasing surface water CO2 concentrations may affect flagellated cells from algae to fish.

Original languageEnglish
Pages (from-to)561-567
Number of pages7
JournalNature Climate Change
Volume10
Issue number6
DOIs
Publication statusPublished - Jun 2020

Keywords

  • behavioural ecology
  • climate-change ecology
  • marine biology

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