Effects of water temperature, light and nitrate on the growth of sporelings of the non-geniculate coralline alga Lithophyllum okamurae (Corallinales, Rhodophyta)
Effects of water temperature, light and nitrate on the growth of sporelings of the non-geniculate coralline alga Lithophyllum okamurae (Corallinales, Rhodophyta)
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DOI：
10.1007/s10811-020-02100-9
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发表时间：
2020-03
影响因子：
3.3
通讯作者：
Sakie Yoshioka;A. Kato;K. Koike;N. Murase;M. Baba;L. Liao
中科院分区：
文献类型：
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作者：
Sakie Yoshioka;A. Kato;K. Koike;N. Murase;M. Baba;L. Liao
珊瑚藻在温带沃茨通常形成一个林下层下面的树冠形成海藻。它们有时在海藻森林减少的贫瘠土地上占主导地位。早期的生活史阶段，如孢子，是海藻种群最初建立和持续存在的关键阶段。因此，必须确定这些珊瑚藻孢子在各种环境因素下的最佳和重要的生长条件。我们调查了使用实验室培养的水温，光照，和硝酸盐水平的非膝状珊瑚algaLithophyllum okamuraewhich是常见的温带西太平洋的孢子的生长的影响。孢子的最适生长温度为20 °C，高于此温度，生长速率降低。最高温度L。Okamuraesporelings存活是30 °C。孢子生长的饱和辐照度（光合光子通量密度）被推断为大约130 μmol光子m−2s− 1，在更大的辐照度下观察到光抑制，这在其他生长在阴凉条件下的珊瑚藻中也类似，表明L.冈村宁次已经适应了这样的条件。的孢子的生长速率与硝酸盐浓度（Vmax/Ks）的初始斜率低于其他珊瑚物种，但类似于其他大型藻类的值。这些结果表明L.在上述生长条件下，Okamuraeis并不比其他大型藻类更耐受;因此，该物种可能与其他大型藻类对未来环境变化的反应相似。
Coralline algae in temperate waters commonly form an understory beneath canopy-forming seaweeds. They are sometimes dominant on barren grounds where seaweed forests have declined. The early life history stage such as a sporeling is a crucial phase for the initial establishment and persistence of the seaweed population. Therefore, the optimum and vital growth conditions for sporelings of these coralline algae under various environmental factors must be defined. We investigated using laboratory culture the effects of water temperature, light, and nitrate levels on the growth of sporelings of a non-geniculate coralline algaLithophyllum okamuraewhich is commonly found in the temperate Western Pacific. The optimum temperature for growth of the sporelings was 20 °C, with the growth rate decreased above this temperature. The highest temperatureL. okamuraesporelings survived was 30 °C. The saturating irradiance (photosynthetic photon flux density) for the growth of the sporelings was inferred as approximately 130 μmol photons m−2s−1with photoinhibition observed at a greater irradiance, which was similarly seen in other coralline algae grown in shade conditions, indicating thatL. okamuraehad adapted to such conditions. The initial slope of the growth rate versus nitrate concentration (Vmax/Ks) of the sporelings was lower than that of other coralline species, but was similar to values for other macroalgae. These results indicate thatL. okamuraeis not more tolerant than other macroalgae under these mentioned growth conditions; hence, this species might respond similarly as other macroalgae against future environmental changes.