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于2008年11月采集了广东柘林湾表层沉积物样品,对沉积物中的甲藻孢囊进行分类鉴定,同时对沉积物进行了直接萌发,并对萌发的浮游植物进行了定性定量分析,以了解柘林湾海域甲藻孢囊的分布状况,揭示赤潮发生潜势.研究结果显示,柘林湾海域甲藻孢囊种类多样性较低,仅分析鉴定出甲藻孢囊16种,有毒有害赤潮藻类亚历山大藻和链状裸甲藻的孢囊分布广泛.孢囊组成以异养型甲藻的孢囊占优势,其中,原多甲藻孢囊种类和密度最为丰富,显示了该海域较高的富营养化程度.孢囊密度较低,在16.59~83.37 cysts·g-1(以干重计,下同)之间,平均为39.52 cysts·g-1.空孢囊百分比均较高,平均百分比达到56.3%,说明大部分孢囊已经萌发.萌发的浮游植物种类数较少,共萌发出浮游植物26属33种,硅藻优势种类主要有拟菱形藻(Pseudonitzschia spp.)、角毛藻(Chaetoceros spp.)、中肋骨条藻(Skeletonema costatum)、圆筛藻(Coscinodiscus spp.)等.甲藻种类数较少,其中以woloszynskioid类中的Biecheleriopsis adriatica为优势甲藻.萌发的浮游植物中还出现了大量金色藻(Chrysochromulina spp.)及球形棕囊藻(Phaeocystis globaosa)等其他类别的潜在有毒种类.本研究结果表明,柘林湾海域沉积物中有毒有害赤潮藻类孢囊分布广泛,并萌发出大量的潜在有毒藻类,说明柘林湾海域具有较高的有害赤潮发生风险.
In November 2008, a sample of surface sediment from Zhelin Bay in Guangdong Province was collected to classify and identify the dinoflagellate cysts in the sediment. At the same time, the sediment was directly germinated and the phytoplankton germinated were qualitatively and quantitatively analyzed. So as to understand the distribution of dinoflagellate cysts in Zhelin Bay and to reveal the potential of red tide occurrence.The results showed that the species diversity of dinoflagellate cysts in Zhelin Bay was low and only 16 species of dinoflagellate cysts were identified and analyzed Cysts of Alexandrium tritaeniorhynchus and Streptodiscus chinensis were distributed widely.The cysts were dominated by cysts of heterotrophic dinoflagellates, of which the species and density of Protocorms were the most abundant, indicating that the sea area Higher eutrophication degree.The cyst density was lower, with an average of 39.52 cysts · g-1 at 16.59-83.37 cysts · g-1 (dry weight, the same below) High and the average percentage reached 56.3%, indicating that most of the cysts have germinated.The number of phytoplankton germinated is few, and there are 33 species of 26 phytoplankton species. The predominant species of diatoms include Pseudonitzschia spp. Chaetoceros spp., Skeletonema costat um, Coscinodiscus spp., etc. There were a few species of dinoflagellates, of which, Biecheleriopsis adriatica in woloszynskioid was the predominant dinoflagellate species.A large number of Chrysochromulina spp. Phaeocystis globaosa, etc. The results of this study indicate that the toxic and harmful algal cysts in the sediments of Zhelin Bay are widely distributed and a large number of potentially toxic algae are sprouted, indicating that the flora of Zhelin Bay The sea area has a higher risk of harmful red tide occurrence.