短期海洋酸化对黄海近岸浮游植物群落结构的影响

为探讨短期海洋酸化对黄海近岸水域浮游植物群落结构的影响,本文在荣成湾海域采用大体积培养实验的方法进行了研究。控制组通入过滤自然空气,CO₂组通入含1000 ppm(Parts per million,百万分之一) CO₂的过滤混合空气。结果表明,CO₂浓度升高引起的海洋酸化显著促进了黄海近岸海域Chl a浓度和浮游植物总丰度的上升,同时浮游植物种类数在高CO₂浓度条件下出现明显下降。不同种类的浮游植物对CO₂浓度升高的响应有所不同,培养过程中CO₂组菱形藻(Nitzschia spp.)和斯氏几内亚藻(Guinardia striata)丰度比控制组出现明显上升,海链藻(Thalassiosira spp.)和中肋骨条藻(Skeletonema costatum)丰度在CO₂组和控制组并未呈现出明显差异。CO₂浓度升高条件下较大粒径浮游植物相比较小粒径浮游植物生长更快。海洋酸化显著改变了黄海近岸水域的浮游植物群落结构,这可能对海洋生态系统产生影响。

Short-term effects of ocean acidification on phytoplankton community structure in nearshore area of Yellow Sea

Short-term effects of elevated seawater pCO₂ concentration on phytoplankton community structure were examined from a controlled 10-d incubation experiment onboard in a nearshore area in Rongcheng Bay, Yellow Sea, China.The control treatments were bubbled with ambient air (395 ppm CO₂) and the experimental treatments were set in 1000 ppm CO₂ (future scenario of the year 2100).Results showed that chlorophyll a concentration and phytoplankton abundance increased and species diversity decreased in CO₂ treatments than that in control treatments.Abundance of Nitzschia spp.and Guinardia striata increased obviously in CO₂ treatments.Simultaneously, abundance of Thalassiosira spp.and Skeletonema costatum changed insignificantly between two treatments.Our research showed that ocean acidification altered phytoplankton community structure and impacted phytoplankton assemblage succession in nearshore of Yellow Sea.More research should be conducted to investigate influence of ocean acidification on marine ecosystem.