Influence of local and regional drivers on spatial and temporal variation of ammonia-oxidizing communities in Gulf of Mexico salt marshes
Influence of local and regional drivers on spatial and temporal variation of ammonia-oxidizing communities in Gulf of Mexico salt marshes
复制标题
DOI：
10.1111/1758-2229.12802
复制
发表时间：
2019-11-12
影响因子：
3.3
通讯作者：
Roberts, Brian J.
中科院分区：
文献类型：
--
作者：
Bernhard, Anne E.;Chelsky, Ariella;Roberts, Brian J.
我们的特点氨氧化古菌（AOA）和细菌（AOB）从盐沼沉积物在墨西哥湾超过5年，以确定环境驱动因素的硝化社区模式后，深水地平线石油泄漏。2012年7月至2016年7月，从路易斯安那州海岸三个地区的12个沼泽地的含油和未含油地点收集了样本。无论是AOA或AOB丰度或社区组成没有一致的石油效应。在当地范围内，丰富的沼泽海拔变化相关，这表明氧气可能是一个重要的驱动程序。丰度的区域差异最好用盐度和土壤湿度来解释，而年际变化可能更多地与气候变化和密西西比河流量有关。AOA群落的变化与沉积物有机质养分有关，AOB群落的变化与土壤有效养分有关。2014年，所有区域的AOA和AOB多样性以及AOB丰度都有所下降，这表明气候等大尺度驱动因素可能解释了整个沿海地区的同步变化。我们的研究结果提供了有关墨西哥湾硝化微生物大规模干扰的见解，并表明氮循环可能主要受当地因素控制，但大规模驱动因素有时可能会超越这些局部差异。
We characterized ammonia-oxidizing archaea (AOA) and bacteria (AOB) from salt marsh sediments in the Gulf of Mexico over 5 years to identify environmental drivers of nitrifying community patterns following the Deepwater Horizon oil spill. Samples were collected from oiled and unoiled sites in July of 2012-2016 from 12 marshes spanning three regions on the Louisiana coast. No consistent oil effect was detected for either AOA or AOB abundance or community composition. At the local scale, abundance was correlated with changes in marsh elevation, suggesting that oxygen may be an important driver. Regional differences in abundance were best explained by salinity and soil moisture, while interannual variation may be more linked to changes in climate and Mississippi River discharge. Variation of AOA communities was correlated with organic sediment nutrients, while AOB communities were correlated with soil extractable nutrients. AOA and AOB diversity and AOB abundance decreased in 2014 in all regions, suggesting that broad-scale drivers, such as climate, may explain synchronous shifts throughout the coastal area. Our results provide insights about large-scale disturbances on nitrifying microbes in the Gulf of Mexico, and suggest that nitrogen cycling may be controlled primarily by local factors, but large-scale drivers might override these localized differences at times.