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Distribution of nitrogen-fixing bacteria in the Central Pacific Ocean

机译：中太平洋中氮素固定细菌的分布

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The plate culture method using the two formulae for non-nitrogenous media was adopted in this investigation for the purpose of counting and isolating nitrogen-fixing bacteria distributed in the open sea.Sea water samples were collected at eighteen different stations in the region of Lat. 50°N–15°S along Long. 155°W and two other stations in the Pacific Ocean. In order to compare with those samples from the open sea, water samples were also obtained at four stations in Suruga and Sagami Bays.Nitrogen-fixing bacteria appear to be widely but very unevenly distributed at all depths in sea water, in numbers approximately ranging from nil to 104 per 100 ml of sea water, and denser vertical populations have been found in the area of Lat. 40°N and 5°N along Long. 155°W, even at depths from 2,000 to 3,000m. A conparatively denser population of bacteria was found in sea water from Suruga Bay and Sagami Bay.The bacteria associated with plankton were abundantly demonstrated, in numbers ranging from 106 to 108 per 1 ml settling volume of plankton, in many plankton samples collected at four stations in the southern parts of the Pacific Ocean. Almost all the bacteria isolated from the samples of blue green algal colonies,Trichodesmium, sp., were able to grow on nonnitrogeneous media.
机译：本研究中采用了使用两种用于非氮介质的培养型的板培养方法，目的是计数和分离在开放海域分布的氮固定细菌。在LAT区域的十八个不同站中收集了水样。长度为50°N-15°S。 155°W和太平洋的另外两个站。为了与来自海洋的那些样品进行比较，还在苏里尤和萨格米湾的四个站中获得水样。润肤膜的四个站点似乎是广泛的，但在海水中的所有深度都被广泛地分布在数量中LAT的地区已经发现了每100毫升海水和密度垂直种群的零。长度为40°N和5°N。 155°W，即使深度为2,000至3,000米。来自Suruga Bay和Sagami Bay的海水中发现了一种明确的细菌群。与浮游生物相关的细菌在四个站收集的许多Plankton样本中，与Plankton相关的细菌大量证明，从106毫升沉降量。在太平洋的南部。几乎所有从蓝绿藻菌落样本中分离的细菌，都能在非顽固的介质上生长。

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