Allelopathic interactions between the red-tide causative dinoflagellate Prorocentrum donghaiense and the diatom Phaeodactylum tricornutum**This study was supported by the Natural Science Foundation of China-Guangdong Province Joint Key Project (U1133003) Science Technology Planning Project of Guangdong Province (2012B020307009) Open Fund from Key Laboratory of Aquatic Eutrophication Control of Harmful Algal Blooms of Guangdong Higher Education Institutes Open Fund from Key Laboratory of Microbial Resources Collection Preservation Ministry of Agriculture.