River management, both modern and historical, have dramatically modified offshore environments. While numerous studies have described the modern impacts, very few have evaluated the legacies remaining from hundreds of years ago. Herein, we show trace metal enrichment in the surface sediment of the abandoned Yellow River Delta, hypothesized to be associated with ancient river management. Essentially, anthropogenic modification caused the river to shift, creating a 12.4×103 km2 area with elevated trace metals; characterized by clear metal deposition gradients. Geographical factors related to the ancient river mouth had the most significant influences on Zn (explained by distance to the river mouth, DTM) and Cd (DTM and sediment salinity), while the sediment absorptive capacity was associated with the reallocation of Cu (clay, silt, and iron), Ni (clay and iron), and Pb (silt and iron). Trace metal legacies showed stronger influences on prokaryotic diversity than on micro-eukaryotic diversity, with the former best described by changes in rare, rather than dominant families and classes, and explainable by an "overlapping micro-niche" model. The ancient river's legacies provide evidence of longer-term human disturbance over hundreds of years; as its impacts on associated benthic microbiomes have led to lessons for modern-day waterway management of benthic ecosystems.
The legacy of trace metal deposition from historical anthropogenic river management: A regional driver of offshore sedimentary microbial diversity.
Hualong Hong,Junwei Li,Qiang Wang,Haoliang Lu,Jingchun Liu,Yun‐wei Dong,Jie Zhang,Jian Li,Mark A. Williams,Bangqin Huang,Chongling Yan
Published 2020 in Journal of Hazardous Materials
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- Publication year
2020
- Venue
Journal of Hazardous Materials
- Publication date
2020-06-11
- Fields of study
Geology, Medicine, Environmental Science
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Semantic Scholar, PubMed
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