Spatial patterns of bacterial abundance, activity and community composition in relation to water masses in the eastern Mediterranean Sea
Spatial patterns of bacterial abundance, activity and community composition in relation to water masses in the eastern Mediterranean Sea
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DOI：
10.3354/ame01393
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发表时间：
2010-04
影响因子：
1.4
通讯作者：
T. Yokokawa;D. Corte;E. Sintes;G. Herndl
中科院分区：
文献类型：
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作者：
T. Yokokawa;D. Corte;E. Sintes;G. Herndl
为了确定特定水团之间和内部的细菌活性和群落组成的变化，在整个水柱中收集样品，在东地中海对应的区域的北方爱琴海，爱琴海中部，西地中海，爱奥尼亚和南爱琴海。低于100米的丰度下降，在所有的站，而随着深度的原核异养活性下降的趋势，目前只有在2的5个站。细菌群落组成（BCC），确定使用自动化rRNA基因间间隔区分析和末端限制性片段长度多态性，也与深度虽然操作分类单位的数量是显着恒定的整个水柱。总体而言，由于水团具有不同的地球化学特征，各水样对的BCC相似性最大值随温度-盐度（T-S）距离的增大而减小。然而，也观察到具有相同T-S值的样本之间的BCC存在相当大的差异，因此在同一水体内，这可能反映了给定水体内有机质场或生物控制的不均匀性。因此，我们得出结论，丰富的细菌群落是非常恒定的深度下到深海沃茨。具有相同温度和盐度的水包裹中的细菌群落的相似性可以从高度相似到非常不同，反映了尽管水包裹的物理均匀性，但基质供应的变化。
To determine the variation of bacterial activity and community composition between and within specific water masses, samples were collected throughout the water column at 5 stations in the eastern Mediterranean Sea corresponding to the regions of the northern Aegean, mid-Aegean, western Cretan, Ionian and southern Aegean Seas. Prokaryotic abundance below 100 m declined with depth at all the stations, while decreasing trends with depth in prokaryotic heterotrophic activity were present only at 2 out of the 5 stations. Bacterial community composition (BCC), determined using both automated rRNA intergenic spacer analysis and terminal-restriction-fragment length polymorphism, was also related to depth although the number of operational taxonomic units was remarkably constant throughout the water column. Overall, the maximums in similarity values of the BCC between water sample pairs decreased with increasing temperature-salinity (T-S) distance of the water samples probably due to distinct biogeochemical characteristics of water masses. However, considerable dissimilarity in the BCC between samples with identical T-S values, and hence within the same water mass, was also observed, possibly reflecting heterogeneity in the organic matter field or in biotic control within a given water body. Thus, we conclude that the richness of bacterial communities is remarkably constant with depth down to bathypelagic waters. The similarity of bacterial communities in water parcels with identical temperature and salinity can range from highly similar to very dissimilar, reflecting variability in substrate supply despite the physical uniformity of water parcels.