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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 P 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.

Item Type:	Article
Authors/Creators:	Wang, Y and Fan, X and Gao, G and Beardall, J and Inaba, K and Hall-Spencer, JM and Xu, D and Zhang, X and Han, W and McMinn, A and Ye, N
Keywords:	climate change, flagella, acidification, microalgae
Journal or Publication Title:	Nature Climate Change
Publisher:	Nature Publishing Group
ISSN:	1758-678X
DOI / ID Number:	https://doi.org/10.1038/s41558-020-0776-2
Copyright Information:	Copyright 2020 The Authors, under exclusive licence to Springer Nature Limited
Related URLs:	Google Scholar: McMinn, A UTAS Profile: McMinn, A
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