束毛藻
蓝藻
异位囊肿
固氮酶
远洋带
透光带
生物
重氮
光养
温带气候
固氮
振荡
环境科学
浮游植物
生态学
发菜
光合作用
鱼腥藻
藻类
环境化学
植物
细菌
营养物
遗传学
作者
Marc Staal,Filip J. R. Meysman,Lucas J. Stal
出处
期刊:Nature
[Springer Nature]
日期:2003-10-02
卷期号:425 (6957): 504-507
被引量:147
摘要
Whereas the non-heterocystous cyanobacteria Trichodesmium spp. are the dominant N2-fixing organisms in the tropical oceans1, heterocystous species dominate N2 fixation in freshwater lakes and brackish environments such as the Baltic Sea2. So far no satisfactory explanation for the absence of heterocystous cyanobacteria in the pelagic of the tropical oceans has been given, even though heterocysts would seem to represent an ideal strategy for protecting nitrogenase from being inactivated by O2, thereby enabling cyanobacteria to fix N2 and to perform photosynthesis simultaneously. Trichodesmium is capable of N2 fixation, apparently without needing to differentiate heterocysts3. Here we show that differences in the temperature dependence of O2 flux, respiration and N2 fixation activity explain how Trichodesmium performs better than heterocystous species at higher temperatures. Our results also explain why Trichodesmium is not successful in temperate or cold seas. The absence of heterocystous cyanobacteria in the pelagic zone of temperate and cold seas, however, requires another explanation.
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