热带典型海湾有害底栖原甲藻藻华的生态学过程及发生机制研究

有害底栖甲藻藻华研究是近年国际热点，虽然很多底栖甲藻有毒有害，但引发高密度的藻华事件并不多见，因此研究难度较大。本项目拟以海南岛新村湾新发现的底栖原甲藻藻华为研究对象，研究热带典型海湾有害底栖甲藻藻华发生的生态学过程及发生机制。通过对新村湾凹面原甲藻种群的时空分布、在不同生境（海草床、大型海藻、红树林、泥质浅滩等）的分布特征、种群在底栖甲藻群落中的竞争关系、与浮游植物间的相互作用、附着基质（海草、海藻、底泥、人工废弃物等）选择性等生态学研究，结合凹面原甲藻的系统发育分析、毒素和毒性分析、生理生态研究等，全面了解凹面原甲藻的生物学和生态学特性，阐明凹面原甲藻种群特征和生态分布规律，分析凹面原甲藻藻华形成的生态学过程。综合现场调查和室内生理实验，研究以凹面原甲藻为代表的热带典型海湾生态系统有害底栖甲藻种群的时空分布规律、环境适应机制和产毒特性，揭示热带海湾有害底栖甲藻藻华的发生机制。

More frequent events and geographic expansion of benthic harmful algal blooms(BHABs) have been recorded worldwide. Tropical regions have long been threatened by toxins and harms associated with blooms of the toxic benthic dinoflagellates. Unfortunately there has few BHAB events been monitored, since blooms occurred at the seabed. In this project, we propose to study the ecological characteristics and bloom occurrence mechanisms of blooms of Prorocentrum concavum, which were previously monitored in the summer in Xincun Bay, Hainan Island by our study team. The research objectives are describing the whole ecological progress of the development of blooms of P. concavum, and revealing the occurrence mechanisms of the bloom. To achieve these objectives, the following research contents are proposed: 1) Spatial and temporal distribution of P. concavum population in Xincun Bay. The time series analysis of population distribution in the different benthic substrates, e.g. muds, reefs, seagrasses, seaweeds and the water column; 2) The population competition among P. concavum and other benthic populations, as well as planktonic populations; 3) The selectivity and preference of P. concavum to different substrates, e.g. seagrasses, seaweeds, plastics; 4) Understanding the physiological adaptations of these organisms to variations in environmental conditions,e.g. nutrients and irradiance; 5) to determine the allelopathic relationships between P. concavum and seagrasses and macroalgal substrates,which may limit or promote their growth and toxicity; 6)to analyze the toxins in P. concavum and shellfishes, and toxicity of the bloom to other marine organisms.