Joint International Research Laboratory of Global Change and Water Cycle, the National Key Laboratory of Water Disaster Prevention, Hohai University, Nanjing 210098, China; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China; Sino-Danish Centre for Education and Research, University of Chinese Academy of Sciences, Beijing 100039, China; Poyang Lake Wetland Research Station, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Jiujiang 332899, China.
Sci Total Environ. 2024 Oct 20;948:174547. doi: 10.1016/j.scitotenv.2024.174547. Epub 2024 Jul 9.
The application of various submerged macrophytes for ecological restoration has gained increasing attention in urban lake ecosystems. The multitrophic microbial communities that colonized in various submerged macrophytes constitute microbial food webs through trophic cascade effects, which affect the biogeochemical cycles of the lake ecosystem and directly determine the effects of ecological restoration. Therefore, it is essential to reveal the diversity, composition, assembly processes, and stability of the microbial communities within epiphytic food webs of diverse submerged macrophytes under eutrophication and ecological restoration scenarios. In this study, we explored the epiphytic microbial food webs of Vallisneria natans and Hydrilla verticillata in both eutrophic and ecological restoration regions. The obtained results indicated that the two regions with different nutrient levels remarkably affected the diversity and composition of epiphytic multitrophic microbial communities of submerged macrophytes, among them, the community composition of epiphytic predators were more prone to change. Secondly, environmental filtering effects played a more important role in driving the community assembly of epiphytic predators than that of prey. Furthermore, the generality and intraguild predation of epiphytic predators were significantly improved within ecological restoration regions, which increased the stability of epiphytic microbial food webs. Additionally, compared with Hydrilla verticillata, the epiphytic microbial food webs of Vallisneria natans exhibited higher multitrophic diversity and higher network stability regardless of regions. Overall, this study focused on the role of the epiphytic microbial food webs of submerged macrophytes in ecological restoration and uncovered the potential of epiphytic predators to enhance the stability of microbial food webs, which may provide new insights into the development of ecological restoration strategies.
各种沉水植物在城市湖泊生态系统中的生态恢复应用受到了越来越多的关注。定植在各种沉水植物上的多营养层微生物群落通过营养级联效应构成微生物食物网，影响湖泊生态系统的生物地球化学循环，直接决定生态恢复的效果。因此，揭示富营养化和生态恢复条件下不同沉水植物附生食物网中微生物群落的多样性、组成、组装过程和稳定性至关重要。在这项研究中，我们探讨了富营养化和生态恢复区苦草和黑藻的附生微生物食物网。结果表明，两种不同营养水平的区域显著影响了沉水植物附生多营养层微生物群落的多样性和组成，其中，附生捕食者的群落组成更容易发生变化。其次，环境过滤效应在驱动附生捕食者群落组装方面比驱动猎物群落组装更为重要。此外，生态恢复区附生捕食者的普遍性和种内捕食作用显著提高，从而增加了附生微生物食物网的稳定性。此外，与黑藻相比，无论区域如何，苦草的附生微生物食物网都表现出更高的多营养层多样性和更高的网络稳定性。总的来说，本研究关注沉水植物附生微生物食物网在生态恢复中的作用，并揭示了附生捕食者增强微生物食物网稳定性的潜力，这可能为生态恢复策略的发展提供新的思路。
