Parameterizing the natural fluorescence kinetics of Thalassiosira weissflogii
Parameterizing the natural fluorescence kinetics of Thalassiosira weissflogii
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DOI：
10.4319/lo.2005.50.5.1499
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发表时间：
2005-09
影响因子：
4.5
通讯作者：
S. Laney;Ricardo M Letelier;M. Abbott
中科院分区：
文献类型：
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作者：
S. Laney;Ricardo M Letelier;M. Abbott
我们研究了在连续培养的浅海硅藻，海链藻weissfloclavis，在自然荧光产量的变化。在这个物种中，动力学在自然荧光产量随时间尺度小于光周期的特点是急剧下降，发生在辐照强度，大概与发病的非光化学荧光猝灭相互转化的叶黄素。在这些减少发生的辐照度，以及随之而来的淬火程度，在这些文化中作为稀释率和辐照强度的函数，独立于生物量的系统变化。在阿拉斯加湾的沿海过渡区的浮游植物组合中观察到类似的自然荧光产量的昼夜动力学。一个经验参数化的开发，以量化这些昼夜动力学的幅度增加淬火和辐照度，它发生，为了跟踪这些动力学的行为在较长的时间尺度的天到几周。
We examined variability in the natural fluorescence yield of a neritic diatom, Thalassiosira weissflogii, in continuous cultures. In this species, kinetics in natural fluorescence yield over time scales less than a photoperiod were characterized by sharp decreases, occurring at irradiance intensities that presumably coincide with the onset of nonphotochemical fluorescence quenching by interconvertible xanthophylls. The irradiance at which these decreases occurred, and the concomitant degree of quenching involved, varied systematically in these cultures as a function of dilution rate and irradiance intensity, independent of biomass. Similar diurnal kinetics in natural fluorescence yield were observed in phytoplankton assemblages in a coastal transition region in the Gulf of Alaska. An empirical parameterization was developed to quantify these diurnal kinetics in terms of the magnitude of this increased quenching and the irradiance at which it occurred, in order to track the behavior of these kinetics over longer time scales of days to weeks.