Red Sea Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
Department of Biosciences, University of Oslo, P. O. Box. 1066 Blindern, 0316 Oslo, Norway; Norwegian Institute for Water Research, Gaustadallèen 21, 0349 Oslo, Norway.
Harmful Algae. 2016 May;55:163-171. doi: 10.1016/j.hal.2016.03.002. Epub 2016 Mar 19.
Harmful algal blooms of the dinoflagellate Pyrodinium bahamense have caused human and economic losses in the last decades. This study, for the first time, documents a bloom of P. bahamense in the Red Sea. The alga was recurrently present in a semi-enclosed lagoon throughout nearly 2 years of observations. The highest cell densities (10-10cellsL) were recorded from September to beginning of December at temperatures and salinities of ∼26-32°C and ∼41, respectively. The peak of the bloom was recorded mid-November, before a sharp decrease in cell numbers at the end of December. Minimum concentrations in summer were at ∼10cellsL. A saxitoxin ELISA immunoassay of cultures and water samples confirmed the toxicity of the strain found in the Red Sea. Moreover, a gene expression analysis of the saxitoxin gene domain SxtA4 showed that transcript production peaked at the culmination of the bloom, suggesting a relation between transcript production, sudden cells increment-decline, and environmental factors.
在过去几十年里，甲藻 Pyrodinium bahamense 的有害水华已经造成了人员和经济损失。本研究首次记录了红海的 P. bahamense 水华。在近 2 年的观测中，这种藻类在一个半封闭的泻湖中反复出现。在 9 月至 12 月初，温度约为 26-32°C，盐度约为 41，记录到了最高的细胞密度（10-10 个细胞/L）。在 11 月中旬，在 12 月底细胞数量急剧下降之前，达到了水华的峰值。夏季的最低浓度约为 10 个细胞/L。对培养物和水样的石房蛤毒素 ELISA 免疫测定证实了在红海发现的该菌株的毒性。此外，对石房蛤毒素基因 SxtA4 基因表达的分析表明，在水华高峰期转录产物的产生达到峰值，这表明转录产物的产生、细胞数量的突然增加-减少与环境因素之间存在关系。
