EFFECT OF TEMPERATURE ON LIGHT‐LIMITED GROWTH AND CHEMICAL COMPOSITION OF SKELETONEMA COSTATUM (BACILLARIOPHYCEAE) 1
EFFECT OF TEMPERATURE ON LIGHT‐LIMITED GROWTH AND CHEMICAL COMPOSITION OF SKELETONEMA COSTATUM (BACILLARIOPHYCEAE) 1
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DOI：
10.1111/j.1529-8817.1979.tb00706.x
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发表时间：
1979-12
影响因子：
2.9
通讯作者：
J. Yoder
中科院分区：
文献类型：
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作者：
J. Yoder
浮游植物对辐照度的响应增长率可以近似为由三个系数定义的双曲线：i）初始斜率（α）; ii）渐近线（μm）; iii）X轴截距或补偿辐照度（Ic）。为了数学地表示温度和辐照度对生长速率的相互作用，必须描述这些常数与温度之间的关系。将海洋硅藻中肋骨条藻（Greville）Cleve在0、5、10、16和22 ℃下在不同辐照度和2 - 3个光周期水平下在单藻培养物中生长。Ic的值为ca。1.0在所有温度下，ly·day−1或更短。初始斜率（div·ly−1）是温度的“U形”函数，由二次多项式描述，α= 0.25-0.02T+0.001T2。在0-10 ℃范围内，μm（div·day−1）是温度的指数函数，由方程μm= 0.48 exp（0.126 T）描述。在每个温度和选定的辐照度，细胞大小和细胞含量的C，N和叶绿素a进行了测定。C：chl a和N：chl a的比值随辐照度的增加而增加，这是因为C增加而chl a减少。在较低的温度（0，5，10 ℃），这两个比率的增加率与辐照度大于在较高的温度（16，22 ℃）。细胞的N含量是独立的光照和温度，C：N比范围从5到8，在低光照下有轻微的倾向较低的值。细胞体积不受温度或辐照度的影响。
Phytoplankton growth rate in response to irradiance can be approximated by a hyperbola defined by three coefficients: i) initial slope (α); ii) asymptote (μm); and, iii) X‐axis intercept or compensation irradiance (Ic). To mathematically represent the interaction of temperature and irradiance on growth rate, one must describe the relationship between these constants and temperature. The marine diatom, Skeletonema costatum (Greville) Cleve, was grown in unialgal culture at different levels of irradiance and 2‐3 photoperiods at 0, 5, 10, 16 and 22 C. The value of Ic is ca. 1.0 ly·day−1 or less at all temperatures. The initial slope (div·ly−1) is a “u‐shaped” function of temperature described by the second degree polynomial, α= 0.25–0.02T+0.001T2. Within the range 0–10 C, μm (div·day−1) is an exponential function of temperature described by the equation, μm= 0.48 exp (0.126T). At each temperature and selected levels of irradiance, cell size and cellular content of C, N and chl a were determined. The C:chl a and N:chl a ratios increased with irradiance because of increases in C and decreases in chl a. At lower temperatures (0, 5, 10 C), the rate of increase of both ratios with irradiance was greater than at the higher temperatures (16, 22 C). Cellular content of N was independent of irradiance and temperature, and the C:N ratio ranged from 5 to 8 with a slight tendency to lower values at low irradiance. Cell volume was not influenced by either temperature or irradiance.