Bacterial community shifts in organically perturbed sediments
Bacterial community shifts in organically perturbed sediments
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DOI：
10.1111/j.1462-2920.2006.01110.x
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发表时间：
2007-01-01
影响因子：
5.1
通讯作者：
Bowman, John P.
中科院分区：
文献类型：
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作者：
Bissett, Andrew;Burke, Chris;Bowman, John P.
研究了塔斯马尼亚鲑鱼（萨尔莫salar）养殖场和邻近参考点有机扰动沉积物中细菌的丰度、多样性和沉积物功能。细菌数量增加，农业和有机负载的进展，通过农场放养周期和休耕期间下降，虽然没有放养前的水平。细菌数量范围约为2 x 10（8）至3 x 10（9）个细胞/g沉积物，并且在饲养笼部位高于参考部位。微电极和呼吸数据也表明了有机负荷对沉积物的明显影响。变性梯度凝胶电泳（DGGE）表明，细菌群落转移都在响应农场加载和停止。季节性对微生物群落的影响也很明显。虽然细菌群落在休耕期间再次发生变化，但这种变化不一定是恢复到前负荷群落。群落变化的复杂性可能会受到细菌群体大量功能冗余的影响。所有的细菌群落，包括那些在参考网站，是高度动态的。修订后的沉积物的responsibility研究表明，养鱼场沉积物至少有弹性和多样性的参考网站社区。这项研究的结果表明，高度复杂的细菌群落的功能冗余有助于其鲁棒性。在细菌群落的多样性和稳定性之间的关系仍然不清楚，需要进一步的调查之前，了解细菌的扰动反应是可能的。
Bacterial abundance, diversity and sediment function were investigated in organically perturbed sediments under Tasmanian salmon (Salmo salar) farms and adjacent reference sites. Bacterial numbers increased as farming and organic loading progressed through the farm stocking cycle and declined during the fallow period, although not to prestocking levels. Bacterial numbers ranged between approximately 2 x 10(8) and 3 x 10(9) cells per gram of sediment and were higher at cage sites than reference sites. Microelectrode and respiration data also demonstrated a clear effect of organic loading on sediments. Denaturing gradient gel electrophoresis (DGGE) showed that bacterial communities shifted both in response to farm loading and its cessation. A seasonal effect on microbial communities was also evident. Although bacterial communities did shift again during the fallowing period, this shift was not necessarily a return to preloading communities. The complexity of community shifts may be affected by the vast functional redundancy of bacterial groups. All bacterial communities, including those at reference sites, were highly dynamic. Respiration studies of amended sediments indicated that fish farm sediments were at least as resilient and diverse as reference site communities. The results of this study indicate that the functional redundancy of highly complex bacterial communities contributes to their robustness. The relationship between diversity and stability in bacterial communities remains unclear and requires further investigation before an understanding of bacterial response to perturbation is possible.