CSIR-National Institute of Oceanography, Dona Paula, Goa, 403004, India.
Bharathidasan University, Tiruchirappalli, Tamil Nadu, India.
Environ Monit Assess. 2019 Jul 16;191(8):496. doi: 10.1007/s10661-019-7616-8.
The bacterial oxidation of sulfur and methane is central to the biogeochemical processes in sediments such as the tropical mangrove sediments. However, there is a lacuna of information on the seasonal interactions including the influence of monsoons which is a major driver of seasonal change, on sulfur-oxidizing bacteria (SOB) and methane-oxidizing bacteria (MOB), their activity and the environmental variables. To understand these interactions, the analysis was carried out on sediment samples that were sampled monthly for a year from Chorao mangrove, Goa, southwest coast of India. SOB (3.8×10CFU g) and MOB (0.90×10CFU g) had maximum average abundance in the surface sediments in the post-monsoon and monsoon season, respectively. The mean sulfur-oxidation activity (SOA) of 2.63 mM day and methane-oxidation activity (MOA) of 110.94 mM day were highest in surface sediments during the post-monsoon season. Generally, the activity of SOB and MOB in surface sediments of post-monsoon was 2.2 times(×) and 2.8× respectively higher than that in the monsoon season. Among the environmental parameters analyzed, protein and sulfide concentrations significantly (p < 0.001) influenced SOA and MOA, respectively. There was a significant difference in SOA (p < 0.003) and MOA (p < 0.036) in surface sediments between the monsoon and the post-monsoon season. During the monsoon season, when the system is a sink of terrestrial/anthropogenic material, the interrelationship of SOB with MOA (r = 0.617, p < 0.001) and SOB with SOA (r = 0.489, p < 0.05) aids in maintaining the homeostasis of the system.
硫和甲烷的细菌氧化作用是热带红树林沉积物等沉积物中生物地球化学过程的核心。然而，关于硫氧化细菌（SOB）和甲烷氧化细菌（MOB）及其活性与环境变量之间的季节性相互作用，包括季风作为季节性变化的主要驱动因素的影响，信息仍然存在空白。为了理解这些相互作用，我们对来自印度西南海岸果阿的 Chorao 红树林的沉积物样本进行了分析，这些样本在一年内每月采集一次。在雨后季风季和季风季，表层沉积物中 SOB（3.8×10CFU g）和 MOB（0.90×10CFU g）的平均丰度最高。雨后季风季表层沉积物中平均硫氧化活性（SOA）为 2.63 mM day，甲烷氧化活性（MOA）为 110.94 mM day，最高。一般来说，雨后季风季表层沉积物中 SOB 和 MOB 的活性分别比季风季高 2.2 倍（×）和 2.8×。在所分析的环境参数中，蛋白质和硫化物浓度分别显著（p < 0.001）影响 SOA 和 MOA。季风季和雨后季风季表层沉积物中的 SOA（p < 0.003）和 MOA（p < 0.036）存在显著差异。在季风季，当系统是陆地/人为物质的汇时，SOB 与 MOA（r = 0.617，p < 0.001）和 SOB 与 SOA（r = 0.489，p < 0.05）之间的相互关系有助于维持系统的动态平衡。
