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Dinoflagellate cyst abundance is positively correlated to sediment organic carbon in Sydney Harbour and Botany Bay, NSW, Australia

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Abstract

There is growing public concern about the global expansion of harmful algal bloom species (HABs), with dinoflagellate microalgae comprising the major portion of the harmful taxa. These motile, unicellular organisms have a lifecycle involving sexual reproduction and resting cyst formation whereby cysts can germinate from sediments and ‘seed’ planktonic populations. Thus, investigation of dinoflagellate cyst (dinocyst) distribution in sediments can provide significant insights into HAB dynamics and contribute to indices of habitat quality. Species composition and abundance of dinocysts in relation to sediment characteristics were studied at 18 stations in two densely populated temperate Australian estuaries, Sydney Harbour (Parramatta River/Port Jackson; PS) and Botany Bay (including Georges River; GB). Eighteen dinocyst taxa were identified, dominated by Protoceratium reticulatum and Gonyaulax sp.1 in the PS estuary, together with Archaeperidinium minutum and Gonyaulax sp.1 in the GB estuary. Cysts of Alexandrium catenella, which is one of the causative species of paralytic shellfish poisoning (PSP), were also detected in both estuaries. Out of the measured sediment characteristics (TOC, Cd, Cr, Cu, Fe, Pb, Mn, Ni, Zn and polycyclic aromatic hydrocarbons), TOC was the parameter explaining most of the variation in dinocyst assemblages and was positively correlated to most of the heavy metals. Given the significant relationship between sediment TOC and dinocyst abundance and heavy metal concentrations, this study suggests that sediment TOC could be broadly used in risk management for potential development of algal blooms and sediment contamination in these estuaries.

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Acknowledgments

The authors thank Marlene Zbinden for conducting the sediment organic carbon analyses and Gustaaf Hallegraeff for assistance with cyst identification. This study was supported by International Science and Technology Cooperation Program of China (No 2010DFA91150), a visiting fellowship from Shandong University and by the Plant Functional Biology and Climate Change Cluster, University of Technology Sydney.

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Correspondence to Martina A. Doblin or Haiyan Pei.

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Responsible editor: Vitor Manuel Oliveira Vasconcelos

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Tian, C., Doblin, M.A., Dafforn, K.A. et al. Dinoflagellate cyst abundance is positively correlated to sediment organic carbon in Sydney Harbour and Botany Bay, NSW, Australia. Environ Sci Pollut Res 25, 5808–5821 (2018). https://doi.org/10.1007/s11356-017-0886-1

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  • DOI: https://doi.org/10.1007/s11356-017-0886-1

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