College of Ecology and Environment, Hainan University, Haikou 570228, People's Republic of China; State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, People's Republic of China.
School of Biology, Hainan Normal University, Haikou 571158, People's Republic of China.
Sci Total Environ. 2021 Jan 20;753:142054. doi: 10.1016/j.scitotenv.2020.142054. Epub 2020 Aug 31.
Sediment microorganisms are influenced by various biotic and abiotic factors. However, information concerning the spatial factors that determine the functional diversity of sediment bacterial communities at an island scale is limited. Here, we conducted an island-scale study to assess the driving forces governing the functional diversity of sediment bacterial communities in different mangroves around the coast of Hainan Island, southern China. For mangrove sediments in Hainan Island, differences in the metabolic activity and functional diversity among four sites were context dependent, while that showed a trend of East > North > West > South. Furthermore, total carbon, nitrite nitrogen, and salinity are important environmental factors that determine the metabolic functional diversity of bacterial communities. This study also provided important insights for explaining the metabolic functional diversity of bacterial communities in tropical mangrove sediments. The metabolic activity had a significantly response to environmental variables (13.2% of pure variance was explained) and spatial variables (12.4%). More importantly, given that spatial variables may contribute to the bacterial functional as important as environmental variables, this spatial variety of bacterial functional provides new insight into studying bacterial functional biogeographic patterns and impacts on sediment-associated function.
沉积物微生物受到各种生物和非生物因素的影响。然而，关于决定岛屿尺度沉积物细菌群落功能多样性的空间因素的信息有限。在这里，我们进行了一项岛屿尺度的研究，以评估控制中国海南岛沿海不同红树林沉积物细菌群落功能多样性的驱动因素。对于海南岛的红树林沉积物，四个地点之间的代谢活性和功能多样性的差异取决于上下文，而表现出东>北>西>南的趋势。此外，总碳、亚硝酸盐氮和盐度是决定细菌群落代谢功能多样性的重要环境因素。本研究还为解释热带红树林沉积物中细菌群落的代谢功能多样性提供了重要的见解。代谢活性对环境变量（纯方差的 13.2%得到解释）和空间变量（12.4%）有显著响应。更重要的是，由于空间变量可能对细菌功能的贡献与环境变量一样重要，这种细菌功能的空间多样性为研究细菌功能生物地理模式及其对与沉积物相关的功能的影响提供了新的视角。
