Influence of Seasonal Variations of Temperature and Light on the Growth Rate of Cultures and Natural Populations of Intertidal Diatoms
Influence of Seasonal Variations of Temperature and Light on the Growth Rate of Cultures and Natural Populations of Intertidal Diatoms
复制标题
温度和光照季节变化对潮间带硅藻培养物和自然种群生长速度的影响
DOI：
10.3354/meps002035
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发表时间：
1980
影响因子：
2.5
通讯作者：
H. Peletier
中科院分区：
文献类型：
--
作者：
W. Admiraal;H. Peletier
对4种底栖硅藻（Navicula salinarum，Amphiprora cf，paludosa，N. arenaria，Gyrosigma spenceni）被保持在泥滩的表面以测量分裂速率。在12月至6月的孵化期间，平均温度是调节细胞分裂速率的主要因素。在冬季和早春，只有在低水位的滩涂站，潮汐水非常浑浊的滩涂浸没是一个重要的因素。强烈的温度波动，在孵化期间，在冬季霜冻期和炎热的夏季天气期间的日照，没有中断的文化的增长。因此，高温和高辐照值是不可能的直接原因，在人口密度的夏季最低值，经常观察到在河口。在冬季最低点后，在泥滩的三个层次上测量了种群密度的增加。在高层站的密度增加，在1月仍然非常低的温度，而在中层和低层站，这种增加开始于3月。这一观察表明，泥滩的出现时间，因此它暴露在全日光是一个重要因素的发展春季水华。沉积物0.5 cm顶层硅藻种群密度仅以非常低的速率增加（最大速率约为1.5 cm）。0.1 doubled-l）。沉积物芯中天然硅藻种群的低光合速率是造成泥滩上天然种群低倍增率的原因。硅藻细胞分散到沉积物中可能是负责光合速率下降，因此，沉积物栖息硅藻的低倍增率。
Cultures of four benthic diatom species (Navicula salinarum, Amphiprora cf, paludosa, N. arenaria, Gyrosigma spenceni) were kept at the surface of a mudflat in order to measure division rates. During incubations in the period of December to June the mean temperature was the predominant factor regulating cell division rate. Immersion of the mudflat with very turbid tidal water was an important factor only at a low-level mudflat station during winter and early spring. Strong temperature fluctuations during incubations, with periods of frost in winter and periods of insolation during hot summer weather, did not interrupt growth of the cultures. Hence high temperatures and high irradiance values are unlikely to be the direct cause of the summer minimum in population density that is frequently observed in the estuary. After the winter minimum the increase in population density was measured at three levels of the mudflat. At the high-level station the density increased in January at still very low temperatures, whereas at the mid- and low-level stations this increase started in March. This observation indicates that the emersion time of the mudflat and hence its exposure to full daylight is an important factor in the development of the spring bloom. The density of the diatom populations in the 0.5 cm top layer of the sediment increased only at a very low rate (with maximum rates of ca. 0.1 doublings d-l). Low photosynthetic rates of natural diatom populations in the sediment core are the cause of these low doubling rates of natural populations on the mudflat. Dispersal of diatom cells into the sediment is probably responsible for the decreased photosynthetic rates and, consequently, for the low doubling rates of sediment-inhabiting diatoms.