Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture and Rural Affairs, Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, China.
Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China; Key Laboratory of Tropical Marine Biotechnology of Hainan Province, Sanya Institute of Oceanology, South China Sea Institute of Oceanology, Sanya 572100, China.
Mar Pollut Bull. 2021 May;166:112229. doi: 10.1016/j.marpolbul.2021.112229. Epub 2021 Mar 9.
To analyze the mechanism of bacterial pathogen removal in seagrass meadows, we compared bacterial pathogens abundance in trapped particles in different seagrass meadows under different intensities of human activities. We compared the particle deposition rates and abundances of bacterial pathogen in Thalassia hemprichii, Enhalus acoroides stands and adjacent unvegetated patches. The bacterial pathogens abundance was much higher in E. acoroides than in adjacent unvegetated patches, however, the trapped particles under T. hemprichii were lower than in nearby unvegetated areas with the exception of the pristine seagrass meadow. These results indicate that seagrass, at least E. acoroides, can remove bacterial pathogens by trapping particles. What is unknown, nevertheless, is how the trapped bacterial pathogens are removed by T. hemprichii. We put forward that antibacterial chemical compounds release from seagrass was stimulated by stress from human activities for inhibition of bacterial pathogen. This putative mechanism needs to be explored in future studies.
为了分析海草床中细菌病原体去除的机制，我们比较了在不同人类活动强度下，不同海草床中捕获颗粒中的细菌病原体丰度。我们比较了 Thalassia hemprichii、Enhalus acoroides 林和相邻无植被斑块中的颗粒沉积速率和细菌病原体丰度。细菌病原体的丰度在 E. acoroides 中比在相邻的无植被斑块中要高得多，然而，在 Thalassia hemprichii 下捕获的颗粒却低于附近无植被区域，除了原始的海草草地。这些结果表明，海草，至少是 E. acoroides，可以通过捕获颗粒来去除细菌病原体。然而，目前尚不清楚 T. hemprichii 是如何去除捕获的细菌病原体的。我们提出，海草受人类活动压力的刺激会释放出抗菌化学物质，以抑制细菌病原体。这种假设的机制需要在未来的研究中探索。
