The basics of acidification: baseline variability of pH on Australian coral reefs
The basics of acidification: baseline variability of pH on Australian coral reefs
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DOI：
10.1007/s00227-010-1456-y
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发表时间：
2010-08-01
期刊：
影响因子：
2.4
通讯作者：
Depczynski, Martial
中科院分区：
文献类型：
--
作者：
Gagliano, Monica;McCormick, Mark I.;Depczynski, Martial
海洋酸化是珊瑚礁生态系统面临的主要威胁之一，但很少有关于珊瑚礁栖息地pH值时空变化的估计。本研究记录了澳大利亚东部（大堡礁，GBR）和西部（宁格鲁礁）海岸之间以100公里纬度分隔的珊瑚礁栖息地（9至10）中pH值的空间变化水平。宁格鲁礁沿岸和近海水域的pH值存在差异（平均值分别为8.45和8.53）。这里的重复评估范围从8.22到8.64。在GBR上，所有生境和重复的值范围为0.39 pH单位（7.98 ~ 8.37）。各生境连续5 d间pH值平均差异0.05，差异不显著。pH值最高的是由鲷鱼Dischistodus perspicillatus维持的丝状藻床。从沙栖虾虎鱼洞中提取的水pH值最低。虽然蜥蜴岛4个生境的pH值在48 h的采样期内有明显的变化，但没有明显的下降趋势。了解pH值在与生活在浅层珊瑚礁上的生物相关的尺度上是如何变化的，对于设计和解释测试水化学变化对生物的影响的实验至关重要，这些变化预计会影响未来的海洋。
Ocean acidification is one of the key threats facing coral reef ecosystems, but there are few estimates of spatial and temporal variability in pH among reef habitats. The present study documents levels of spatial variability in pH among coral reef habitats (9 to 10), among locations separated by 100's km of latitude and between east (Great Barrier Reef, GBR) and west (Ningaloo Reef) coasts of Australia. Differences were found in pH between inshore and offshore waters along Ningaloo Reef (means 8.45, 8.53, respectively). Replicate assessments here ranged from 8.22 to 8.64. On the GBR, the range of values over all habitats and replicates was 0.39 pH units (7.98 to 8.37). There were minor but significant differences of 0.05 pH units between 5 consecutive days for habitats on average. Highest pH was recorded in filamentous algal beds maintained by the damselfish Dischistodus perspicillatus. Lowest pH was found in water extracted from sand-dwelling goby holes. While there were marked changes in pH over a 48-h sampling period among 4 habitats at Lizard Island (GBR), there was little evidence of a diel trend. Understanding how pH varies at scales that are relevant to organisms that live on shallow coral reefs is crucial for the design and interpretation of experiments that test the effects on organisms of the changes in water chemistry predicted to affect oceans in the future.