Falcón Luisa I, Noguez Ana M, Espinosa-Asuar Laura, Eguiarte Luis E, Souza Valeria
Laboratorio de Evolución Molecular y Experimental, Instituto de Ecología, UNAM, Mexico.
Mar Genomics. 2008 Jun;1(2):55-61. doi: 10.1016/j.margen.2008.06.005. Epub 2008 Sep 13.
Regardless of the importance of bacterial assemblages as essential components of ecosystems, little is known about how their populations are structured. We analyzed the composition and turnover rates, based on 16S rDNA sequences, of surface water oceanic bacterial assemblages of the fraction between 0.1 and 0.8 μm along a latitudinal gradient (45°6'42''N in the North Atlantic to 15°8'37''S in the South Pacific) including geographic distance, temperature, chlorophyll a and salinity. Here we show that oceanic bacterial assemblages between 0.1 and 0.8 μm, can be structured by a variety of environmental interactions that include separation by distance and chlorophyll a concentration in temperate North Atlantic coastal samples and temperature in tropical Atlantic and Pacific coastal and open ocean samples. Bacterial phyla composition diverged between temperate and tropical regions. This study suggests that some bacterial assemblages could be structured both by environmental and spatial factors, while others by environmental factors alone.
尽管细菌群落作为生态系统的重要组成部分至关重要，但对于它们的种群结构却知之甚少。我们基于16S rDNA序列，分析了沿纬度梯度（从北大西洋的北纬45°6'42''到南太平洋的南纬15°8'37''）的0.1至0.8微米粒径的地表水海洋细菌群落的组成和周转率，其中包括地理距离、温度、叶绿素a和盐度。我们在此表明，0.1至0.8微米的海洋细菌群落可由多种环境相互作用构建，包括在温带北大西洋沿海样本中按距离和叶绿素a浓度分离，以及在热带大西洋和太平洋沿海及开阔海洋样本中按温度分离。细菌门类组成在温带和热带地区有所不同。这项研究表明，一些细菌群落可能由环境和空间因素共同构建，而另一些则仅由环境因素构建。
