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Rising temperatures may increase growth rates and microcystin production in tropical Microcystis species

机译：温度升高可能会增加热带微囊藻物种的生长速率和微囊藻毒素产量

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摘要

Rising temperatures (1.4-6 degrees C) due to climate change have been predicted to increase cyanobacterial bloom occurrences in temperate water bodies; however, the impacts of warming on tropical cyanobacterial blooms are unknown. We examined the effects of four different temperatures on the growth rates and microcystin (MC) production of five tropical Microcystis isolates (M. ichthyoblabe (two strains), M. viridis, M. flos-aquae, and M. aeruginosa). The temperature treatments are based on current temperature range in Singapore's reservoirs (27 degrees C and 30 degrees C), as well as projected mean (33 degrees C) and maximum temperatures (36 degrees C) based on tropical climate change estimates of +6 degrees C in air temperature. Increasing temperatures did not significantly affect the maximum growth rates of most Microcystis strains. Higher growth rates were only observed in one M. ichthyoblabe strain at 33 degrees C and M.flos-aquae at 30 degrees C where both were isolated from the same reservoir. MC-RR and MC-LR were produced in varying amounts by all four species of Microcystis. Raised temperatures of 33 degrees C were found to boost total MC cell quota for three Microcystis strains although further increase to 36 degrees C led to a sharp decrease in total MC cell quota for all five Microcystis strains. Increasing temperature also led to higher MC-LR:MC-RR cell quota ratios in M. ichthyoblabe. Our study suggests that higher mean water temperatures resulting from climate change will generally not influence growth rates of Microcystis spp. in Singapore except for increases in M. ichthyoblabe strains. However, toxin cell quota may increase under moderate warming scenarios depending on the species. (C) 2015 Elsevier B.V. All rights reserved.
机译：据预测，由于气候变化而引起的温度升高（1.4-6摄氏度）会增加温带水域中蓝藻水华的发生。但是，变暖对热带蓝藻水华的影响尚不清楚。我们检查了四种不同温度对五个热带微囊藻分离株（ichthyoblabe（两个菌株），M。viridis，M。flos-aquae和M. aeruginosa）的生长速率和微囊藻毒素（MC）产生的影响。温度处理基于新加坡水库的当前温度范围（27摄氏度和30摄氏度），以及基于+6摄氏度的热带气候变化估计的预计平均温度（33摄氏度）和最高温度（36摄氏度）。空气温度C。温度升高并没有明显影响大多数微囊藻菌株的最大生长速率。仅在33摄氏度的鱼鳞鱼和30摄氏度的水蓝藻中发现了较高的生长率，这两个菌株均从同一水库中分离出来。所有四种微囊藻产生的MC-RR和MC-LR数量不同。发现升高的温度33摄氏度可提高三种微囊藻菌株的总MC细胞配额，尽管进一步升高至36摄氏度会导致所有五种微囊藻菌株的总MC细胞配额急剧下降。温度升高还导致鱼鳞支原体的MC-LR：MC-RR细胞配额比提高。我们的研究表明，气候变化导致的较高平均水温通常不会影响微囊藻的生长速度。在新加坡，除了鱼鳞支原体菌株增加。但是，根据物种的不同，在中等升温情况下，毒素细胞的配额可能会增加。 （C）2015 Elsevier B.V.保留所有权利。

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  • 来源
    《Harmful Algae》 |2015年第12期|88-98|共11页
  • 作者

    Mowe Maxine A. D.; Porojan Cristina; Abbas Feras; Mitrovic Simon M.; Lim Richard P.; Furey Ambrose; Yeo Darren C. J.;

  • 作者单位

    Natl Univ Singapore, Dept Biol Sci, Freshwater & Invas Biol Lab, Singapore 117543, Singapore;

    Cork Inst Technol, Dept Phys Sci, MSRC, Cork, Ireland;

    Cork Inst Technol, Dept Phys Sci, MSRC, Cork, Ireland;

    Natl Univ Singapore, Dept Biol Sci, Freshwater & Invas Biol Lab, Singapore 117543, Singapore|Univ Technol Sydney, Sch Life Sci, Appl Ecol Team, Broadway, NSW 2007, Australia;

    Univ Technol Sydney, Sch Life Sci, Appl Ecol Team, Broadway, NSW 2007, Australia;

    Cork Inst Technol, Dept Phys Sci, MSRC, Cork, Ireland;

    Natl Univ Singapore, Dept Biol Sci, Freshwater & Invas Biol Lab, Singapore 117543, Singapore;

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  • 正文语种 eng
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  • 关键词

    Cyanobacteria; Blooms; Singapore; Tropical; Reservoirs;

    机译：蓝细菌;花;新加坡;热带;水库;

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