Effects of triazine herbicide prometryn on marine phytoplankton communities—Based on analysis of microalgae population dynamics, interspecific competition and photosynthetic capacity
LI Yi-lei1, LIANG Wei1,2, ZHAO Zi-ang1, RU Shao-guo1, ZHANG Xiao-na1
1. Marine Life Science College, Ocean University of China, Qingdao 266003, China; 2. Department of Ecology and Environment of Shandong Province, Jinan 250102, China
Abstract：In this study, effects of prometryn on the population dynamics, photosynthetic capacity, and interspecific competition of three marine microalgae species, including Phaeodactylum tricornutum, Chlorella pacifica, and Isochrysis galbana, were evaluated based on the monoculture experiment and the co-culture experiment with two microalgaes (cell density ratio1:1). The results showed that the 96h-EC50 values of prometryn for P. tricornutum, C. pacifica, and I. galbana were 7.65, 16.67, and 4.11 μg/L, respectively; and the toxicity from high to low was as follows:I. galbana > P. tricornutum > C. pacifica. Prometryn exposure significantly inhibited the photosynthesis of these three microalgaes and thereby reduced their population growth. In addition, prometryn treatment also weakened the competitive inhibition of P. tricornutum by C. pacifica in the co-culture group and during the cocultivation of C. pacifica and I. galbana exposed to environmental concentrations (0.5 and 5μg/L) of prometryn for 12 days, an extinction of the sensitive species I. galbana was observed, indicating an interspecific interaction more favorable to diatoms. Overall, this study would provide more theoretical support for assessing the marine ecological risk of the triazine herbicide prometryn.
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