Université de Lyon, INRA, CNRS, Université Lyon 1, Ecologie Microbienne (UMR 5557, USC 1193), 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne, France.
Biol Lett. 2012 Aug 23;8(4):562-6. doi: 10.1098/rsbl.2011.0990. Epub 2012 Jan 18.
Although environmental filtering has been observed to influence the biodiversity patterns of marine bacterial communities, it was restricted to the regional scale and to the species level, leaving the main drivers unknown at large biogeographic scales and higher taxonomic levels. Bacterial communities with different species compositions may nevertheless share phylogenetic lineages, and phylogenetic turnover (PT) among those communities may be surprisingly low along any biogeographic or environmental gradient. Here, we investigated the relative influence of environmental filtering and geographical distance on the PT between marine bacterial communities living more than 8000 km apart in contrasted abiotic conditions. PT was high between communities and was more structured by local environmental factors than by geographical distance, suggesting the predominance of a lineage filtering process. Strong phenotype-environment mismatches observed in the ocean may surpass high connectivity between marine microbial communities.
尽管环境过滤被认为会影响海洋细菌群落的生物多样性模式，但这种影响仅限于区域尺度和物种水平，而在大的生物地理尺度和更高的分类学水平上，其主要驱动因素仍不清楚。然而，具有不同物种组成的细菌群落可能共享系统发育谱系，并且在任何生物地理或环境梯度上，这些群落之间的系统发育周转率 (PT) 可能都非常低。在这里，我们研究了环境过滤和地理距离对生活在相隔 8000 多公里、具有截然不同非生物条件的海洋细菌群落之间的 PT 的相对影响。PT 在群落之间较高，并且受局部环境因素的结构比受地理距离的影响更大，这表明存在主导的谱系过滤过程。在海洋中观察到的强烈的表型-环境不匹配可能超过海洋微生物群落之间的高连通性。
