Effects of irradiance on pigment signatures of harmful algae during growth process |
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| Authors: | LIU Shuxi YU Zhigang YAO Peng ZHENG Yan and LI Dong |
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| Affiliation: | Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China |
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| Abstract: | Three harmful algal bloom (HAB) species, Phaeocystis globosa, Thalassiosira rotula, and Prorocentrum donghaiense were isolated from the coast of China and cultured in batches at three light intensities (40, 70 and 150 μmol photons·m−2·s−1). The variation patterns of cell numbers and growth rates with light intensity during growth process were different among
species. In P. globosa and T. rotula, maximum growth rates were found at 150 μmol photons·m−2·s−1 and ranged from 0.60 divisions per day in T. rotula, to 1.17 divisions per day in P. globosa. The highest growth rate of P. donghaiense, however, was found at 70 μmol photons·m−2·s−1 (0.36 divisions per day). In general, all the three HAB species showed adaptation to increasing light intensity by decreasing
cellular concentrations of chlorophyll a (Chl a), but the variation patterns during the growth process were species-specific.
The cellular concentrations of Chl a in P. donghaiense and T. rotula increased gradually with incubation time, but the opposite trend was found in P. globosa. Most of the pigment ratios and pigment indices of these three species were nearly constant during the growth process and
showed small changes at different light intensities illustrating the applicability of chemotaxonomy during the initial and
developing stages of HAB events, which is very important to study the ecological issues related to HAB species. Ratios of
photoprotective carotenoids, such as diadinoxanthin, diatoxanthin and β, β-carotene to total chlorophylls a (Tchl a) showed the trend of increasing with the increase of light intensity during growth
process. The species-specific and pigment-specific variations in pigment ratios/indices at different light intensities during
growth process probably reflected the differences in the pigment composition as well as the adaption capabilities of different
species to the changes of physical conditions. |
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| Keywords: | harmful algal bloom light intensity growth rate pigment ratio pigment index cellular concentration |
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