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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Temperature-dependent photosynthesis in the intertidal alga Fucus gardneri and sensitivity to ongoing climate change
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Temperature-dependent photosynthesis in the intertidal alga Fucus gardneri and sensitivity to ongoing climate change

机译：潮间藻Fusus gardneri的温度依赖性光合作用及其对持续气候变化的敏感性

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Understanding the photosynthetic responses of marine macroalgae to changes in their thermal environment is vital to characterizing the success of these habitat-forming primary producers in the face of climate change. We measured net photosynthesis in apical tips of Fucus gardneri collected from the intertidal zone of Friday Harbor, WA over a range of irradiance levels (0-1500 μmol photons m~(-2) s~(-1)) at 10°, 14°, and 18℃ to determine levels of saturating irradiance. We then recorded net photosynthesis at saturating irradiance in tips exposed to seawater temperatures ranging from 6 to 22℃, as well as dark respiration. Results show that F. gardneri at this location has a peak in net photosynthesis at 16-18℃ seawater temperature, with significant declines in net photosynthesis at 20° and 22℃. Respiration showed a positive linear relationship with increasing seawater temperature. Using archived seawater temperature, irradiance, and tidal data, we produced a model of net photosynthesis over two years (October 2010-October 2012). Maximal seawater temperatures recorded at FHL rarely exceeded 14℃, suggesting that an increase of + 2 and +4℃ in seawater temperature would lead to increased net photosynthesis at this site. These results allowed us to develop a predictive model to forecast the net photosynthesis of F. gardneri at different intertidal elevations to explore the effects of seawater temperature and irradiance on net photosynthesis. We also examined the effects of the timing of high tide, testing the hypothesis that net photosynthesis will be highest at sites where submersion occurs during peak levels of irradiance. Our results suggest that as seawater temperatures increase (up to +4℃ above ambient) F. gardneri below +1 m MLLW tidal elevation will experience increases in net photosynthesis. These analyses also suggest that the effects of environmental change may depend in part on tidal regime, which determines the extent to which algae are submerged during times of day when irradiance is high.
机译：了解海洋大型藻类对其热环境变化的光合作用响应，对于表征这些形成栖息地的初级生产者面对气候变化的成功至关重要。我们测量了在10°，14辐照度水平下（0-1500μmol光子m〜（-2）s〜（-1））在一定范围内从华盛顿州星期五港潮间带收集到的墨角榕顶端的净光合作用。 °和18℃确定饱和辐照度水平。然后，我们记录了暴露于6至22℃海水温度以及黑暗呼吸的尖端在饱和辐照下的净光合作用。结果表明，该位置的加德纳氏菌在海水温度为16-18℃时有一个净光合作用的峰值，而在20°和22℃时该净光合作用的下降明显。呼吸与海水温度升高呈正线性关系。利用存档的海水温度，辐照度和潮汐数据，我们建立了两年内（2010年10月至2012年10月）净光合作用的模型。 FHL记录的最高海水温度很少超过14℃，表明海水温度升高+2和+ 4℃会导致该地点的净光合作用增加。这些结果使我们能够建立一个预测模型，以预测不同潮间高程F. gardneri的净光合作用，从而探索海水温度和辐照度对净光合作用的影响。我们还检查了涨潮时机的影响，检验了以下假设：净辐照度在辐照度峰值期间浸入水中的位置最高。我们的结果表明，随着海水温度的升高（比环境温度高出+ 4℃），低于+1 m MLLW的潮汐加尔纳德里海藻的净光合作用将会增加。这些分析还表明，环境变化的影响可能部分取决于潮汐制度，潮汐制度决定了在辐照度高的一天中藻类被淹没的程度。

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