Bleaching in Amphistegina gibbosa d’Orbigny (Class Foraminifera): observations from laboratory experiments using visible and ultraviolet light
Bleaching in Amphistegina gibbosa d’Orbigny (Class Foraminifera): observations from laboratory experiments using visible and ultraviolet light
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Amphistegina gibbosa d’Orbigny（有孔虫纲）的漂白：使用可见光和紫外线进行的实验室实验观察
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
P. Hallock
中科院分区：
文献类型：
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作者：
Dana E Williams;P. Hallock
自1991年以来，在世界各地的珊瑚礁中记录了含硅藻的有孔虫Amphistegina种群的白化（共生颜色的可见丧失）。实地研究和先前的实验室实验强烈暗示太阳辐射是白化压力的因素。在实验室中，利用PAR（光谱峰为450 nm的“蓝色”和600 nm的“白色”）和生物有效紫外辐射[UVB (280-320 nm)]的荧光源，研究了光合有效辐射（PAR）和紫外辐射（UV）的光谱质量和数量对Amphistegina gibbosa生长速率和漂白的影响。在6-8 μmol光子m−2 s−1的PAR下，最大壳直径增加，生长速度在“蓝色”光下增加，不受UVB≤0.0162 W m−2的影响。漂白的频率随着PAR光子通量密度的增加和暴露于较短波长而增加，无论总能量是否增加。0.105 W m−2的UVB显著抑制了生长。暴露于UVB与PAR比为bb0 0.003的处理中的标本颜色变深，而不是漂白，先前的细胞学研究表明这是一种光保护反应。这些实验表明，影响光谱质量或太阳辐射数量的环境因素可以影响两栖藻的白化。
Bleaching (visible loss of symbiont color) in populations of the diatom-bearing foraminifer Amphistegina has been recorded from reefs worldwide since 1991. Field studies and previous laboratory experiments have strongly implicated solar radiation as a factor in bleaching stress. The influence of spectral quality and quantity of photosynthetically active radiation (PAR) and ultraviolet radiation (UV) on growth rates and bleaching in Amphistegina gibbosa was investigated in the laboratory using fluorescent sources of PAR (‘blue’ with a spectral peak at 450 nm and ‘white’ with a 600-nm spectral peak) and biologically effective ultraviolet radiation [UVB (280–320 nm)]. Growth rate, as indicated by increase in maximum shell diameter, saturated at a PAR of 6–8 μmol photon m−2 s−1, increased in ‘blue’ light, and was not influenced by UVB≤0.0162 W m−2. Frequency of bleaching increased with increasing PAR photon flux density and with exposure to shorter wavelengths, with or without an increase in total energy. Growth was significantly inhibited by UVB at 0.105 W m−2. Specimens in treatments exposed to UVB to PAR ratios >0.003 became dark in color, rather than bleaching, which previous cytological studies indicate is a photo-protective response. Implications of these experiments are that environmental factors that affect either the spectral quality or quantity of solar radiation can influence bleaching in Amphistegina.