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光强对萱藻孢子萌发、幼苗早期发育及附生藻类动态变化的影响 被引量:2

Effects of light intensity on spore germination,early development of the sporelings of Scytosiphon lomentaria and the dynamic change of epiphytic algae
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摘要 模拟萱藻育苗条件,以萱藻丝状体为材料,沙滤天然海水作为培养液,研究了光照强度[7.2-126.0μmol/(m2·s)]对萱藻孢子萌发、幼苗早期发育及附生藻类动态变化的影响。结果显示:(1)本实验条件下,萱藻孢子萌发的适宜光强范围为27.0-72.0μmol/(m2·s)。其中,在45.0μmol/(m2·s)条件下,萱藻孢子萌发率较高,并在放散后的第16天萌发率达到(44.44%±11.00%);(2)在本实验条件下,萱藻幼苗早期生长的适宜光强范围为36.0-54.0μmol/(m2·s),其中45.0μmol/(m2·s)最适宜萱藻幼苗的生长,且附生藻类密度最低,孢子放散后第34天附生藻类密度为(38.4±0.6)×104个/cm2;(3)本研究共鉴定出附生藻类2门13属29种,主要优势种为碎片菱形藻、小伪菱形藻、艳绿颤藻、膨胀色球藻、耳形藻和新月菱形藻。其中碎片菱形藻在7.2-18.0μmol/(m2·s)条件下呈指数增长,而耳形藻与新月菱形藻在27.0-126.0μmol/(m2·s)条件下呈指数增长。研究表明,萱藻孢子萌发和幼苗早期发育的最佳光强为45.0μmol/(m2·s),且在萱藻育苗过程中应重点防治的附生藻类为耳形藻与新月菱形藻。 In this research,by using experimental ecology to imitate the culture conditions of sporelings of Scytosiphon lomentaria,the filaments of S. lomentaria and the natural sand filtered seawater were used as the experimental material and the culture solution, respectively. Different light intensity which includes 7. 2, 18.0,27.0,36.0,45.0,54.0,72.0,127.0 μmol/( m2 · s) were set to study the effect of light intensity 7.2 -126.0 μmol/(m2 · s)on spore germination,early development of sporelings of S. lomentaria and the dynamic change of epiphytic algae. The results indicated that: ( 1 ) 27.0 - 72. 0 μmol/( m2 · s) was the appropriate light intensity range for the spore germination of S. lomentaria, and the spore germination rate reached the maximum under the condition of 45.0 μmol/(m2 ·s) ,the germination rate was 44.44% after 16 days of the spores releasing. (2) In the natural sand filtered seawater, 36.0 - 54.0 μmol/( m2 · s) was the appropriate light intensity range for the early development of sporelings, and the optimal light intensity was 45.0 μmol/(m2 · s), under whose condition the epiphytic algae density was the lowest and the epiphytic algae density was 38.4 × 104 ind/cm2 after 34 days of the spores releasing. (3) In this study, a total of 29 taxa which belong to 13 genera of 2 phyla were identified, and the main dominant species were Nitzschia frustulum, Pseudo-Nitzschia sicula, Oscillatoria laetevirens, Chroococcus turgidus,Auricula sp. and Nitzschia closterium. Nitzschia frustulum showed exponential growth trend under the condition of 7.2 -18 μmol/( m2 · s) ,while Auricula sp. and N. closterium presented exponential growth trend under the condition of 27.0 -126.0 μmol/( m2 · s). In conclusion,45.0 μmol/( m2 · s)was the optimal light intensity for spore germination and early development of sporelings of S. lomentaria. The epiphytic algae, which should be controlled in the process of sporelings production,were Auricula sp. and N. closterium.
出处 《水产学报》 CAS CSCD 北大核心 2014年第12期2018-2028,共11页 Journal of Fisheries of China
基金 国家"八六三"高技术研究发展计划(2012AA10A413)
关键词 萱藻 孢子萌发 幼苗 附生藻类 光照强度 Scytosiphon lomentaria spore germination sporelings epiphytic algae light intensity
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