School of Marine Sciences/Guangdong Key Laboratory of Marine Resources and Coastal Engineering, Sun Yat-sen University, Guangzhou, 510275, China.
Scottish Association for Marine Science, Scottish Marine Institute, Oban, Argyll, PA37 1QA, Scotland, UK.
Mar Pollut Bull. 2018 Feb;127:823-830. doi: 10.1016/j.marpolbul.2017.10.005. Epub 2017 Oct 10.
Water quality in Tolo Harbour and Channel (Tolo) has been improved since 1998 after the diversion of sewage effluent. However, it remains poorly understood how nutrient loading reduction has impacted the phytoplankton community. To evaluate this, we applied a Phytoplankton Community Index PI(mp) to the 23-year data (1991-2013) at inner (TM4) and outer (TM8) sites in Tolo, with the former being more eutrophic than the latter. The results show that 1) the phytoplankton community changed with time after sewage diversion; 2) "diatoms and dinoflagellates" were better indicators of nutrient impact than "autotrophic/mixotrophic and heterotrophic dinoflagellates"; 3) the rate of recovery differed between the two stations, but both reached a similar state at a similar time; 4) seasonality of the phytoplankton community showed greater disturbance in spring than in other seasons. Our findings indicate that the nutrient reduction in the Tolo resulted in a positive change in the phytoplankton community.
自 1998 年污水改道以来，吐露港及海峡的水质已有改善。然而，对于营养负荷减少如何影响浮游植物群落，仍知之甚少。为了评估这一点，我们应用浮游植物群落指数 PI(mp)对 1991 年至 2013 年在吐露港内（TM4）和外（TM8）区的 23 年数据进行了分析，前者比后者更富营养化。结果表明：1）污水改道后浮游植物群落随时间发生变化；2）“硅藻和甲藻”比“自养/混合营养和异养甲藻”更能指示营养影响；3）两个站位的恢复速度不同，但在相似时间达到相似状态；4）浮游植物群落的季节性在春季比其他季节受到更大的干扰。我们的发现表明，吐露港的营养物质减少导致浮游植物群落发生了积极的变化。
