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The Effects of Temperature on the Growth of and Ammonia Uptake by Marine Microalgae

溫度對海洋微藻生長和吸收氨氮能力的影響

摘要


擬球藻(Nannochloropsis oculata)、等鞭金藻(Isochrysis aff. galbana)、牟氏角毛藻(Chaetocerosmuelleri)和周氏扁藻(Tetraselmis chui)在三天的培養中以第一天的生長速率最快。將四種微藻培養在不同的溫度,以第一天的生長速率比較這些微藻的成長和吸收總氨氮(TAN)的效率。它們在25°C時,每個細胞的乾重分別為10.3、40.4、39.7 和369 pg。它們的最適成長溫度分別為26、28、33 和25°C。在25°C 時,四種微藻的生長速率沒有顯著的差異。四種微藻最大生產量的溫度分別為30、30、35、和20~30°C,四種微藻最大比總氨氮吸收效率的溫度分別為25、25、20~30 和25°C。在所有測試的溫度中,周氏扁藻總氨氮吸收的效率在四種微藻中是最高的。而且周氏扁藻在25°C 的總氨氮吸收效率高於其它溫度。本研究的結果建議利用周氏扁藻去除室內集約海水養殖系統的氨氮是最好的選擇。

關鍵字

海洋微藻 生長速率 藻類產量

並列摘要


Four species of microalgae were evaluated at different temperatures for their ability to remove ammonia from intensive marine fish/shrimp culture systems. Growth rates were highest on the first of three days of culturing for marine microalgae Nannochloropsis oculata, Isochrysis aff. galbana, Chaetoceros muelleri, and Tetraselmis chui. This rate was used to compare both the growth and the total ammonium nitrogen (TAN) uptake efficiencies of these organisms at different temperatures. Their dry weights (DWs) per cell were 10.3 pg for Nannochloropsis oculata, 40.4 pg for Isochrysis aff. galbana, 39.7 pg for Chaetoceros muelleri, and 369 pg for Tetraselmis chui at 25°C. Temperatures for their respective optimal growth rates were 26, 28, 33, and 25°C. There were no significant differences in growth rates among these four microalgal species at 25°C. Temperatures for maximal biomass production were 30°C for both Nannochloropsis oculata and Isochrysis aff. galbana, 35°C for Chaetoceros muelleri, and 20~30°C for Tetraselmis chui. Temperatures for maximal specific TAN uptake were respectively 25, 25, 20~30, and 25°C. Overall, Tetraselmis chui was the most efficient at TAN uptake among the four species. Our results suggest that T. chui is a good choice for removing ammonia from indoor intensive marine culture systems.

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