Development of Anabaena blooms in a small reservoir with dense sediment akinete population, with special reference to temperature and irradiance
Development of Anabaena blooms in a small reservoir with dense sediment akinete population, with special reference to temperature and irradiance
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DOI：
10.1093/plankt/25.9.1059
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发表时间：
2003-09
影响因子：
2.1
通讯作者：
S. Tsujimura;T. Okubo
中科院分区：
文献类型：
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作者：
S. Tsujimura;T. Okubo
1998年和1999年监测了一个小型农业水库中鱼腥藻水华的发展。在水库的沉积物分析的所有区域中，发现了大量的鱼腥藻akinetes，在最上层（0- 2cm）的平均细胞密度为1.5 × 104 cm-3。1998年5月中旬和1999年4月下旬，当水温超过15°C时，鱼腥藻的丝状体数量开始呈指数增长。用细丝数测定的平均原位净生长速率为0.18d-1。以水库底泥中的不定线鱼腥藻为材料，研究了温度对不定线鱼腥藻萌发的影响。在14 ° C至23°C之间的温度下观察到高发芽率;然而，在没有辐照的情况下，Anabaena akinetes不会发芽。利用A.从水库中分离的ucrainica表明，孵育温度增加到26°C导致比生长速率上升。因此，有人假设，温度升高可以类似地提高A的生长速率。在开花发育期间的ucrainica。此外，从A.在蓝藻水华形成过程中，沉积物中密度较大的动孢子虫种群所产生的初始接种物会促进水华的形成，并能提高鱼腥藻水华形成的相对概率。
The development of Anabaena ucrainica blooms in a small agricultural reservoir was monitored in 1998 and 1999. In the reservoir, numerous Anabaena akinetes were found in all regions of the sediment analyzed, with an average cell density in the uppermost layer (0-2 cm) of 1.5 X 10 4 cm -3 . Anabaena ucrainica filament numbers began to increase exponentially in mid-May 1998 and in late April 1999, when the water temperature exceeded 15°C. The average in situ net growth rate was 0.18 day -1 as measured by filament numbers. The effect of temperature on germination of the akinetes was investigated using Anabaena akinetes taken from the reservoir sediment. High germination percentages were observed at temperatures between 14 and 23°C; however, the Anabaena akinetes did not germinate without irradiance. Growth experiments using an axenic culture of A. ucrainica isolated from the reservoir showed that an increase in incubation temperature to 26°C resulted in a rise in the specific growth rate. Consequently, it was hypothesized that temperature increases could similarly enhance the growth rate of A. ucrainica during bloom development. Furthermore, judging from the in situ growth rate of A. ucrainica, initial inocula arising from dense akinete populations in the sediment would advance bloom formation and could enhance the relative probability of Anabaena bloom formation.