Characteristics of phytoplankton community structure during and after a bloom of the dinoflagellate Scrippsiella trochoidea by HPLC pigment analysis |
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| Authors: | Chun-kwan Wong Chong-kim Wong |
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| Institution: | (1) Department of Biology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China |
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| Abstract: | A bloom of the dinoflagellate Scrippsiella trochoidea was detected for the first time in inner Tolo Harbor, Hong Kong in 2 000. Water samples were collected at eight stations
along a transect passing through a red tide patch for microscopic analysis of phytoplankton composition and high-performance
liquid chromatography (HPLC) analysis of phytoplankton pigments. During the bloom, the density of dinoflagellates was 1.1×106 cells L−1 within the patch and 8.6×105 cells L−1 outside the patch where the phytoplankton community was dominated by diatoms. After the bloom the S. trochoidea began to decrease in density and was replaced by diatoms as the dominating bloom-causing organisms at all stations, and the
density of dinoflagellates at most stations was less than 1.0 × 106 cells L−1. The status of S. trochoidea as the causative species of the bloom was indicated by the presence of peridinin, the marker pigment for dinoflagellates.
The shift from dinoflagellates to diatoms was marked by the decline of peridinin and the prevalence of fucoxanthin. Phytoplankton
pigment markers also revealed the presence of other minor phytoplankton assemblages such as cryptomonads and blue-green algal. |
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| Keywords: | coastal water HPLC phytoplankton pigments bloom Scrippsiella trochoidea |
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