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首页> 外文期刊>Marine biology >Photosynthetic rapid light curves for Padina sanctae-crucis vary with irradiance, aerial exposure, and tides in Hawaii's micro-intertidal zones
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Photosynthetic rapid light curves for Padina sanctae-crucis vary with irradiance, aerial exposure, and tides in Hawaii's micro-intertidal zones

机译：夏威夷微潮间带中Padina sanctae-crucis的光合作用快速光曲线随辐照度，空气暴露和潮汐而变化

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摘要

Environmental variations can have major consequences on photosynthesis and in turn impact the settlement, productivity, or survival of plants in the intertidal zones. Low tides in Hawaii fluctuate < 1 m yet expose intertidal macroalgae to high tropical temperatures and irradiances, which are predicted to have negative physiological consequences. To better understand environmental variations, temperature, exposure duration, and irradiance were measured in two intertidal zones on O'ahu over 8 days with negative tidal heights. Then to test whether these conditions were stressful, the photosynthetic response (via pulse amplitude modulated fluorometry) and relative water content of a common intertidal macroalgae, Padina sanctae-crucis, was measured over varying tidal heights. We found that P. sanctae-crucis was exposed to air from 0 to 6 h on days with tropical irradiance (237-2000 A mu mol photon m(-2) s(-1)) and a range of temperatures (20.4-32.3 A degrees C), yet plants were able to maintain relatively high water content. Photosynthetic parameters for P. sanctae-crucis derived from light response curves were found to vary with irradiance. High irradiances were associated with lowered maximum rates of electron transport (rETR(max)) and effective quantum yield (I broken vertical bar (PSII)). It was also determined that macroalgae exhibited different curves with tidal state. P. sanctae-crucis had relatively increased saturation irradiances (E (k)) and increased rETR(max) but lowered effective quantum yield (I broken vertical bar (PSII)) during negative tidal heights when aerial exposure is more common. P. sanctae-crucis was then exposed to air for up to 40 min in a laboratory experiment to determine the effect on fluorescence parameters. The 40-min aerial exposure, a duration smaller than which occurs at low tide, resulted in reduced rETR(max), alpha, and I broken vertical bar (PSII). This manipulation combined with field observations indicate that aggregations of thalli combined with water motion and minimal tidal fluctuations help to limit water loss and maintain photosynthetic rates. From these results, we can conclude, for this system, high irradiances are a major factor that likely limits production.
机译：环境变化可能会对光合作用产生重大影响，进而影响潮间带植物的沉降，生产力或生存。夏威夷的潮汐波动<1 m，但潮间带巨藻暴露于热带高温和高辐照度下，预计这会对生理造成负面影响。为了更好地了解环境变化，在8天的潮汐高度为负的情况下，对瓦胡岛的两个潮间带进行了温度，暴露时间和辐照度的测量。然后，为了测试这些条件是否令人紧张，在不同的潮高下测量了普通潮间大型藻Padina sanctae-crucis的光合作用响应（通过脉冲幅度调制荧光法）和相对水含量。我们发现P. sanctae十字花科在热带辐射（237-2000 Aμmol光子m（-2）s（-1））和一定温度范围（20.4-32.3）的情况下，暴露于空气中0至6 h摄氏1度），但植物却能够保持较高的水分含量。发现从光响应曲线得出的圣果果实的光合参数随辐照度而变化。高辐照度与降低的最大电子传输速率（rETR（max））和有效的量子产率（I垂直竖线（PSII））相关。还确定了大型藻类在潮汐状态下表现出不同的曲线。在潮汐高度为负值的情况下，当更常见于空中暴露时，圣子油菜具有相对增加的饱和辐照度（E（k））和rETR（max）但降低了有效量子产率（I折断垂直线（PSII））。然后，在实验室实验中，将圣保罗十字绣暴露于空气中长达40分钟，以确定对荧光参数的影响。 40分钟的空中暴露（持续时间小于退潮时的持续时间）导致rETR（max），α和I折断竖线（PSII）减小。这种操作与现场观察相结合表明，沙丘的聚集与水运动和最小的潮汐波动相结合，有助于限制水分流失并保持光合速率。从这些结果可以得出结论，对于该系统，高辐照度是可能限制生产的主要因素。

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  • 来源
    《Marine biology》 |2015年第5期|1061-1076|共16页
  • 作者

    Cox T. Erin; Smith Celia M.;

  • 作者单位

    Univ Paris 06, Univ Sorbonne, Observ Oceanol, LOV,UMR 7093, F-06230 Villefranche Sur Mer, France|Univ Hawaii, Dept Bot, Honolulu, HI 96822 USA;

    Univ Hawaii, Dept Bot, Honolulu, HI 96822 USA;

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