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Macrofaunal control of microbial community structure in continental margin sediments.
Proceedings of the National Academy of Sciences of the United States of America ( IF 11.1 ) Pub Date : 2020-07-07 , DOI: 10.1073/pnas.1917494117
Longhui Deng , Damian Bölsterli , Erik Kristensen , Christof Meile , Chih-Chieh Su , Stefano Michele Bernasconi , Marit-Solveig Seidenkrantz , Clemens Glombitza , Lorenzo Lagostina , Xingguo Han , Bo Barker Jørgensen , Hans Røy , Mark Alexander Lever

Through a process called “bioturbation,” burrowing macrofauna have altered the seafloor habitat and modified global carbon cycling since the Cambrian. However, the impact of macrofauna on the community structure of microorganisms is poorly understood. Here, we show that microbial communities across bioturbated, but geochemically and sedimentologically divergent, continental margin sites are highly similar but differ clearly from those in nonbioturbated surface and underlying subsurface sediments. Solid- and solute-phase geochemical analyses combined with modeled bioturbation activities reveal that dissolved O2 introduction by burrow ventilation is the major driver of archaeal community structure. By contrast, solid-phase reworking, which regulates the distribution of fresh, algal organic matter, is the main control of bacterial community structure. In nonbioturbated surface sediments and in subsurface sediments, bacterial and archaeal communities are more divergent between locations and appear mainly driven by site-specific differences in organic carbon sources.



中文翻译:

大陆边缘沉积物中微生物群落结构的宏观动物控制。

自寒武纪以来,通过称为“生物扰动”的过程,穴居大型动物改变了海底栖息地,并改变了全球碳循环。但是,人们对大型动物对微生物群落结构的影响知之甚少。在这里,我们显示了整个生物扰动的微生物群落,但是在地球化学和沉积学上是不同的,大陆边缘站点高度相似,但与非生物扰动的表层和下层地下沉积物中的微生物群落明显不同。固相和溶质相地球化学分析与模拟的生物扰动活动相结合显示溶解的O 2洞穴通风的引入是古细菌群落结构的主要驱动力。相比之下,调节新鲜藻类有机物分布的固相返工是细菌群落结构的主要控制。在非生物扰动的地表沉积物和地下沉积物中,细菌和古细菌群落之间的位置差异更大,主要由有机碳源的特定地点差异驱动。

更新日期:2020-07-08
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