In situ measured seasonal variations in Fv/Fm of two common Red Sea corals
In situ measured seasonal variations in Fv/Fm of two common Red Sea corals
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原位测量两种常见红海珊瑚 Fv/Fm 的季节变化
DOI：
10.1007/s00338-006-0144-3
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发表时间：
2006
期刊：
影响因子：
3.5
通讯作者：
S. Beer
中科院分区：
文献类型：
--
作者：
G. Winters;Y. Loya;S. Beer
脉冲幅度调制（PAM）荧光测定法被建议作为估计珊瑚环境压力的工具。然而，有关“正常”（即非漂白）年份珊瑚最大量子产率（Fv/Fm）自然变化的信息有限。在这项研究中，现场测量的 Stylophora pistillata 和 Favia favus 的 Fv/Fm 季节性变化与太阳辐照度的季节性变化相关，但与海水温度的季节性变化无关。通过在受控条件下生长这些珊瑚和大角珊瑚，进一步研究了海水温度和辐照度之间的相互作用。在正常或高温下暴露于强光下会导致比在两种温度下暴露于低光下的 Fv/Fm 值更低。因此，高辐照度可能会导致珊瑚的 Fv/Fm 值下降，其程度至少与高温一样（如果不是更多的话）。当使用 PAM 荧光测定法作为预测珊瑚白化的诊断工具时，应考虑到这种季节性变化。
Pulse amplitude modulated (PAM) fluorometry has been suggested as a tool for estimating environmental stresses on corals. However, information regarding natural changes in maximal quantum yields (Fv/Fm) of corals during “normal” (i.e. non-bleaching) years has been limited. In this study, seasonal variations in Fv/Fm for Stylophora pistillata and Favia favus, measured in situ, correlated with seasonal changes in solar irradiance but not in sea temperature. Interactions between sea temperature and irradiance were further studied by growing these corals and Pocillopora damicornis under controlled conditions. Exposure to high light with normal or high temperatures resulted in lower Fv/Fm values than exposure to low light at both temperatures. Thus, high irradiances may cause decreased Fv/Fm values in corals at least as much as, if not more than, high temperatures. Such seasonal variations should be taken into account when using PAM fluorometry as a diagnostic tool for predicting coral bleaching.