Tracing the Century‐Long Evolution of Microplastics Deposition in a Cold Seep. Issue 10 (3rd February 2023)

• Record Type: Journal Article
• Authors: Feng, Jing‐Chun; Li, Can‐Rong; Tang, Li; Wu, Xiao‐Nan; Wang, Yi; Yang, Zhifeng; Yuan, Weiyu; Sun, Liwei; Hu, Weiqiang; Zhang, Si
• Is Part Of: Advanced science. Volume 10:Issue 10(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-02-03
• Subjects: century‐long evolution -- cold seep -- methane -- microplastics -- natural gas hydrate; Science -- Periodicals; 505
• DOI: 10.1002/advs.202206120
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: Microplastic (MP) pollution is one of the greatest threats to marine ecosystems. Cold seeps are characterized by methane‐rich fluid seepage fueling one of the richest ecosystems on the seafloor, and there are approximately more than 900 cold seeps globally. While the long‐term evolution of MPs in cold seeps remains unclear. Here, how MPs have been deposited in the Haima cold seep since the invention of plastics is demonstrated. It is found that the burial rates of MPs in the non‐seepage areas significantly increased since the massive global use of plastics in the 1930s, nevertheless, the burial rates and abundance of MPs in the methane seepage areas are much lower than the non‐seepage area of the cold seep, suggesting the degradation potential of MPs in cold seeps. More MP‐degrading microorganism populations and functional genes are discovered in methane seepage areas to support this discovery. It is further investigated that the upwelling fluid seepage facilitated the fragmentation and degradation behaviors of MPs. Risk assessment indicated that long‐term transport and transformation of MPs in the deeper sediments can reduce the potential environmental and ecological risks. The findings illuminated the need to determine fundamental strategies for sustainable marine plastic pollution mitigation in the natural deep‐sea environments. Abstract : Century‐long evolution of microplastic deposition in cold seep sediment is investigated in detail. Microplastics in the non‐seepage areas can reflect the historical usage of synthetic polymers, while that in the methane seepage locations are more likely to be carried into the water column, or fragmented and degraded in the sediment.