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Changes in marine dinoflagellate and diatom abundance under climate change



Marine diatoms and dinoflagellates play a variety of key ecosystem roles as important primary producers (diatoms and some dinoflagellates) and grazers (some dinoflagellates). Additionally some are harmful algal bloom (HAB) species and there is widespread concern that HAB species may be increasing accompanied by major negative socio-economic impacts, including threats to human health and marine harvesting1,2. Using 92,263 samples from the Continuous Plankton Recorder survey, we generated a 50-year (1960–2009) time series of diatom and dinoflagellate occurrence in the northeast Atlantic and North Sea. Dinoflagellates, including both HAB taxa (for example, Prorocentrum spp.) and non-HAB taxa (for example, Ceratium furca), have declined in abundance, particularly since 2006. In contrast, diatom abundance has not shown this decline with some common diatoms, including both HAB (for example, Pseudo-nitzschia spp.) and non-HAB (for example, Thalassiosira spp.) taxa, increasing in abundance. Overall these changes have led to a marked increase in the relative abundance of diatoms versus dinoflagellates. Our analyses, including Granger tests to identify criteria of causality, indicate that this switch is driven by an interaction effect of both increasing sea surface temperatures combined with increasingly windy conditions in summer.

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Figure 1: Abundance of dinoflagellates and diatoms in the northeast Atlantic region from 1960 to 2009 based on twelve diatom taxa and nine dinoflagellate taxa routinely identified in the CPR samples.
Figure 2: Abundance of selected taxa in the northeast Atlantic region to illustrate the shift from dinoflagellates to diatoms during the past 50 years.
Figure 3: Decadal spatio-temporal changes in abundances of selected dinoflagellates and diatoms in the northeast Atlantic.


  1. Anderson, D. M. in Red Tides: Biology, Environmental Science and Toxicology (eds Okaichi, T., Anderson, D. M. & Nemoto, T.) 11–16 (Elsevier, 1989).

    Google Scholar 

  2. Hallegraeff, G. M. A review of harmful algal blooms and their apparent global increase. Phycologia 32, 79–99 (1993).

    Article  Google Scholar 

  3. Reid, P. C., Edwards, M., Hunt, H. G. & Warner, A. J. Phytoplankton change in the North Atlantic. Nature 391, 546–546 (1998).

    Article  CAS  Google Scholar 

  4. Moore, S. K., Mantua, N. J., Hickey, B. M. & Trainer, V. L. Recent trends in paralytic shellfish toxins in Puget Sound, relationships to climate, and capacity for prediction of toxic events. Harmful Algae 8, 463–477 (2009).

    Article  CAS  Google Scholar 

  5. Hallegraeff, G. M. Ocean climate change, phytoplankton community responses, and harmful algal blooms: A formidable predictive challenge. J. Phycol. 46, 220–235 (2010).

    Article  CAS  Google Scholar 

  6. Richardson, A. J. et al. Using Continuous Plankton Recorder data. Prog. Oceanogr. 68, 27–74 (2006).

    Article  Google Scholar 

  7. Escalera, L., Pazos, Y., Morono, A. & Reguera, B. Noctiluca scintillans may act as a vector of toxigenic microalgae. Harmful Algae 6, 317–320 (2007).

    Article  Google Scholar 

  8. Okaichi, T. & Nishio, S. Identification of ammonia as the toxic principle of red tide of Noctiluca miliaris. Bull. Plankton Soc. Jpn 23, 25–30 (1976).

    Google Scholar 

  9. R Development Core Team R: A Language and Environment for Statistical Computing (R Foundation for Statistical Computing Vienna, Austria, 2009) available at

  10. Pebesma, E. J. & Bivand, R. S. Classes and methods for spatial data in R. R. News 5, 9–13 (2005).

    Google Scholar 

  11. Pebesma, E. J. Multivariable geostatistics in S: The gstat package. Comput. Geosci. 30, 683–691 (2004).

    Article  Google Scholar 

  12. Fraga, S. & Bakun, A. in Toxic Phytoplankton Blooms in the Sea (eds Smayda, T. J. & Shimizu, Y.) 59–65 (Elsevier Science Publisher, 1993).

    Google Scholar 

  13. Fehling, J. et al. Domoic acid production by Pseudo-nitzschia seriata (Bacillariophyceae) in Scottish waters. J. Phycol. 40, 622–630 (2004).

    Article  CAS  Google Scholar 

  14. Fehling, J., Davidson, K., Bolch, C. & Tett, P. Seasonality of Pseudo-nitzschia spp. (Bacillariophyceae) in western Scottish waters. Mar. Ecol. Prog. Ser. 323, 91–105 (2006).

    Article  CAS  Google Scholar 

  15. Fehling, J., Davidson, K. & Bates, S. S. Growth dynamics of non-toxic Pseudo-nitzschia delicatissima and toxic P. seriata (Bacillariophyceae) under simulated spring and summer photoperiods. Harmful Algae 4, 763–769 (2005).

    Article  Google Scholar 

  16. Beaugrand, G. et al. Reorganization of North Atlantic marine copepod biodiversity and climate. Science 296, 1692–1694 (2002).

    Article  CAS  Google Scholar 

  17. Pyper, B. J. & Peterman, R. M. Comparison of methods to account for autocorrelation in correlation analyses of fish data. Can. J. Fish. Aquat. Sci. 55, 2127–2140 (1998).

    Article  Google Scholar 

  18. Thurman, W. N. & Fisher, M. E. Chickens, eggs, and causality, or which came 1st. Am. J. Agr. Econ. 70, 237–238 (1988).

    Article  Google Scholar 

  19. Mann, K. H. & Lazierm, J. R. N. Dynamics of Marine Ecosystems. Biological—Physical Interactions in the Oceans (Blackwell, 1996).

    Google Scholar 

  20. Margalef, R. Life-forms of phytoplankton as survival alternatives in an unstable environment. Oceanol. Acta 1, 493–509 (1978).

    Google Scholar 

  21. Ross, O. N. & Sharples, J. Phytoplankton motility and the competition for nutrients in the thermocline. Mar. Ecol. Prog. Ser. 347, 21–38 (2007).

    Article  CAS  Google Scholar 

  22. Berdalet, E. et al. Species-specific physiological response of dinoflagellates to quantified small-scale turbulence. J. Phycol. 43, 965–977 (2007).

    Article  Google Scholar 

  23. Smayda, T. J. Adaptations and selection of harmful and other dinoflagellate species in upwelling systems 1. Morphology and adaptive polymorphism. Prog. Oceanogr. 85, 53–70 (2010).

    Article  Google Scholar 

  24. Tomas, C. R. in Identifying Marine Phytoplankton (ed. Tomas, C. R.) (Academic, 1997).

    Google Scholar 

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A funding consortium made up of governmental agencies from Canada, France, Iceland, Ireland, the Netherlands, Portugal, the UK and the US financially supports the CPR survey. G.C.H. was supported by the Climate Change Consortium for Wales (C3W). S.L.H. was financially supported by a NERC doctoral training grant (NE/G524344/1) awarded to M.B.G. and G.C.H.

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G.C.H. and M.B.G. conceived the study; S.L.H. and A.W.W. compiled the data; S.L.H., M.B.G. and G.C.H. led the data analyses and interpretation with contributions from all authors. S.L.H. and G.C.H. wrote the paper with contributions from all authors.

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Correspondence to Graeme C. Hays.

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Hinder, S., Hays, G., Edwards, M. et al. Changes in marine dinoflagellate and diatom abundance under climate change. Nature Clim Change 2, 271–275 (2012).

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