Trophic regulation of Vibrio cholerae in coastal marine waters.
Trophic regulation of Vibrio cholerae in coastal marine waters.
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DOI：
10.1111/j.1462-2920.2005.00863.x
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发表时间：
2006
影响因子：
5.1
通讯作者：
A. Worden;M. Seidel;Steven Smriga;A. Wick;F. Malfatti;D. Bartlett;F. Azam
中科院分区：
文献类型：
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作者：
A. Worden;M. Seidel;Steven Smriga;A. Wick;F. Malfatti;D. Bartlett;F. Azam
由霍乱弧菌引起的霍乱每年折磨着全世界数十万人。霍乱弧菌是水生环境的特有种，其在海洋系统中的增殖和动态尚不清楚。在这里，我们表明，在各种沿海海水条件下，霍乱弧菌主要保持在一个自由生活的状态，而不是附着在颗粒上。自由生活的霍乱弧菌的生长率（微生物：0.6-2.9天（-1））很高（与细菌组合的报告值相似; 0.3-2.5天（-1）），特别是在浮游植物水华沃茨。然而，这些人口受到严重的放牧死亡率的原生动物捕食者。因此，放牧死亡率抵消了增长，使霍乱弧菌种群受到控制。当霍乱弧菌增殖时，在特别强烈的水华条件下观察到净种群增益，部分通过快速生长（> 4 doughs day（-1））克服放牧压力。我们的结果表明，霍乱弧菌受到原生动物的控制，并且能够在海洋环境中利用多种增殖途径。这些发现表明食物网效应在控制这种病原体在沿海沃茨的扩散中起着重要作用，应该在疾病风险的预测模型中加以考虑。
Cholera disease, caused by the bacterium Vibrio cholerae, afflicts hundreds of thousands worldwide each year. Endemic to aquatic environments, V. cholerae's proliferation and dynamics in marine systems are not well understood. Here, we show that under a variety of coastal seawater conditions V. cholerae remained primarily in a free-living state as opposed to attaching to particles. Growth rates of free-living V. cholerae (micro: 0.6-2.9 day(-1)) were high (similar to reported values for the bacterial assemblages; 0.3-2.5 day(-1)) particularly in phytoplankton bloom waters. However, these populations were subject to heavy grazing-mortality by protozoan predators. Thus, grazing-mortality counterbalanced growth, keeping V. cholerae populations in check. Net population gains were observed under particularly intense bloom conditions when V. cholerae proliferated, overcoming grazing pressure terms in part via rapid growth (> 4 doublings day(-1)). Our results show V. cholerae is subject to protozoan control and capable of utilizing multiple proliferation pathways in the marine environment. These findings suggest food web effects play a significant role controlling this pathogen's proliferation in coastal waters and should be considered in predictive models of disease risk.