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首页> 外文期刊>Marine ecology progress series >Photo-physiological costs associated with acute sediment stress events in three near-shore turbid water corals
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Photo-physiological costs associated with acute sediment stress events in three near-shore turbid water corals

机译：与三种近岸混浊水域珊瑚的急性沉积物应力事件相关的光生理成本

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摘要

Many coral reef communities thriving in inshore coastal waters characterised by chronically high natural turbidity (＞5 mg l~(-1)) have adapted to low light (＜200 umol photons m~(-2) s~(-1)) and high sedimentation rates (＞10 mg cm~(-2) d~(-1)). Yet, short (hours) acute sediment stress events driven by wind waves, dredging operations involving suction or screening, or shipping activities with vessel wake or propeller disturbance, can result in a rise in turbidity above the natural background level. Although these may not be lethal to corals given the time frame, there could be a considerable impact on photo-trophic energy production. A novel sediment delivery system was used to quantify the effects of 3 acute sediment resuspension stress events (turbidity = 100, 170, 240 mg l~(-1); sedimentation rates = 4, 9, 13 mg cm~(-2) h~(-1)) on 3 inshore turbid water corals common in the Indo-Pacific (Merulina ampliata, Pachyseris speciosa and Platygyra sinensis). Coral photo-physiology response (respiration, net photosynthesis, and maximum quantum yield) was measured immediately after 2 h of exposure. The respiration rate increased (from 0.72-1.44 to 0.78-1.76 μmol O_2 cm~(-2) h~(-1)) as the severity of the acute sediment resuspension event increased, whereas the photosynthetic rate declined (from 0.25-0.41 to -0.19-0.25 μmol O_2 cm~(-2) h~(-1)). Merulina was the least tolerant to acute sediment resuspension, with a photosynthesis and respiration ratio (P/R ratio) of ＜1.0 when turbidity levels reached ＞170 mg l~(-1), while Platygyra was most tolerant (P/R ＞ 1.0). Fluorescence yield data suggest that the rapid photo-acclimation ability of Platygyra enabled it to maintain a positive carbon budget during the experiments, illustrating species-specific responses to acute sediment stress events.
机译：许多以长期高浊度为特征的近岸沿海水域蓬勃发展的珊瑚礁群落（> 5 mg l〜（-1））已适应弱光（＜200 umol光子m〜（-2）s〜（-1））和高沉降速率（＞ 10 mg cm〜（-2）d〜（-1））。然而，由风浪，涉及抽吸或筛选的疏dr操作或受到船舶尾流或螺旋桨干扰的航运活动所驱动的短暂（数小时）的急性沉积物应力事件，可能会导致浊度高于自然本底水平。尽管在给定的时间范围内这些可能不会对珊瑚致死，但对光养能量的生产可能会产生相当大的影响。一种新型的泥沙输送系统用于量化3种急性泥沙再悬浮应力事件的影响（浊度= 100、170、240 mg l〜（-1）;沉淀速率= 4、9、13 mg cm〜（-2）h 〜（-1））在印度洋-太平洋（Merulina ampliata，Pachyseris speciosa和Platygyra sinensis）中常见的3个近岸混浊水域珊瑚上。暴露2小时后立即测量珊瑚的光生理反应（呼吸，净光合作用和最大量子产率）。随着急性泥沙再悬浮事件的严重性增加，呼吸速率增加（从0.72-1.44增至0.78-1.76μmolO_2 cm〜（-2）h〜（-1）），而光合速率下降（从0.25-0.41降至-0.19-0.25μmolO_2 cm〜（-2）h〜（-1））。 Merulina对急性沉积物的耐受性最低，当浊度达到＞ 170 mg l〜（-1）时，光合作用和呼吸比（P / R比）＜1.0，而对侧柏的耐受力最大（P / R＞ 1.0）。 ）。荧光产量数据表明，桔梗的快速光适应能力使其能够在实验期间维持正的碳收支，从而说明了物种对急性沉积物胁迫事件的反应。

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  • 来源
    《Marine ecology progress series》 |2014年第15期|129-143|共15页
  • 作者

    Nicola K. Browne; Elimar Precht; Kim S. Last; Peter A. Todd;

  • 作者单位

    DHI Water and Environment, 1 Cleantech Loop, #03-05 CleanTech One, Singapore 637141,Experimental Marine and Ecology Laboratory, Department of Biological Sciences, National University of Singapore, Singapore 117543;

    DHI Water and Environment, 1 Cleantech Loop, #03-05 CleanTech One, Singapore 637141;

    Scottish Association for Marine Science, Scottish Marine Institute, Oban, Argyll PA37 1QA, UK;

    Experimental Marine and Ecology Laboratory, Department of Biological Sciences, National University of Singapore, Singapore 117543,Tropical Marine Science Institute, National University of Singapore, Singapore 117543;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Turbidity; Sedimentation; Sediment resuspension; Mesocosm experiments; Coral photosynthesis; Singapore;

    机译：浊度沉降;沉积物重悬;中观实验;珊瑚的光合作用;新加坡;

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