NITROGEN-FIXATION (ACETYLENE-REDUCTION) ASSOCIATED WITH MACRO-ALGAE IN A CORAL-REEF COMMUNITY IN BAHAMAS
NITROGEN-FIXATION (ACETYLENE-REDUCTION) ASSOCIATED WITH MACRO-ALGAE IN A CORAL-REEF COMMUNITY IN BAHAMAS
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DOI：
10.1007/bf00390624
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发表时间：
1977-01-01
期刊：
影响因子：
2.4
通讯作者：
TAYLOR, BF
中科院分区：
文献类型：
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作者：
CAPONE, DG;TAYLOR, DL;TAYLOR, BF
大巴哈马岛附近珊瑚礁上的氮气固定(C2H2还原)与几种大型藻类有关。微藻的感染率最高。(Chlorophyceae)和Dictyota sp.(褐藻亚科)。氮气的固定剂是大量的丝状蓝藻，而不是异养细菌：在Microdictyon sp.的实验中，在好氧或厌氧条件下，这种活性是依赖于光的，不受有机化合物的刺激。在20米深处和船上进行的现场测试，给出了类似的氮气固定率；蓝藻可能有色素适应在蓝光下发挥作用。与Microdictyon sp.相关的最大固氮速率为3.8µg N固定g干重1h-1。珊瑚礁群落在营养贫乏的水域中茁壮成长，因此，任何N的输入都可能对稳定这种生态系统很重要。
N2 fixation (C2H2 reduction) was associated with several species of macroalgae on a coral reef near Grand Bahama Island. The highest rates were associated with Microdictyon sp. (Chlorophyceae) and Dictyota sp. (Phaeophyceae). Extensive mats of filamentous blue-green algae, not heterotrophic bacteria, were the N2 fixing agents: in experiments with samples of Microdictyon sp., the activity was light-dependent and not stimulated by organic compounds under either aerobic or anaerobic conditions. Assays in situ, at 20 m depth and on shipboard, gave similar rates of N2 fixation; the cyanophytes presumably have pigment adaptations to function in blue light. The maximum rate of N2 fixation, associated with Microdictyon sp., was 3.8 .mu.g N fixed g dry wt-1 h-1. Coral-reef communities flourish in nutrient-impoverished waters, and therefore any input of N is probably important in stabilizing such ecosystems.