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JPR Advance Access published online on January 19, 2007
Journal of Plankton Research, doi:10.1093/plankt/fbm008
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© The Author 2007. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Cyst formation: an important mechanism for the termination of Scrippsiella trochoidea (Dinophyceae) bloom

Zhao-Hui Wang*, Yuzao Qi and Yufeng Yang

Institute of Hydrobiology, Jinan University, Guangzhou, 510632, China

* : Corresponding author Tel: +86-20-85225100, Fax: +86-20-85220239 E-mail: twzh{at}jnu.edu.cn

Received on June 10, 2006; revised on October 18, 2006; accepted on December 7, 2006


  Abstract

A sediment trap study was conducted at Daya Bay, South China Sea, to investigate the relationships between encystment and population dynamics of Scrippsiella trochoidea from December 1999 to January 2001. A dense bloom of S. trochoideaoccurred during the study period from August to September 2000, with the maximum cell number of 3.18 x 104 cells mL–1. Two morphotypes of cysts, one with a thick calcareous wall (calcified cyst), another without the obvious calcareous cover (non-calcified cyst), were observed during this investigation. The morphological and excystment characteristics of these two cyst types were studied as well. Mass encystments of S. trochoidea, with the maximum of 3.05 x 105 cysts m–2 d–1 for calcified cyst, and 1.54 x 107 cysts m–2 d–1 for non-calcified cyst, coincided with the maximum abundance of the vegetative cells. Encystment caused the transfer of a total of 2.24-4.49 x 108 cells m–2 vegetative cells from the water column to the sea bottom during the bloom, and resulted in a considerable loss of the bloom population. High assemblages of cysts of S. trochoidea were detected in the surface sediments as well. This rich "seed bed" in the surface sediments caused by the high efficiency of encystment after blooms acting as a benthic reservoir for future vegetative population, together with the short dormant period (15-26d) and high germination rate (50-90%), may explain the repeated occurrence of S. trochoidea blooms in Daya Bay.

Key Words: Scrippsiella trochoidea • cyst • algal bloom • South China Sea

Communicating editor: KJ Flynn


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