A ~ 40-year paleoenvironmental record from the Swan Oxbow, Yangtze River, China, inferred from testate amoebae and sedimentary pigments

We present a ~ 40–year record of environmental change in the Swan Oxbow, Yangtze River, China, inferred from testate amoeba and sedimentary pigment data, combined with remote sensing and analysis of local socio–economic growth. These data indicate there were several distinct phases of aquatic condit...

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Bibliographic Details
Published in:Journal of paleolimnology 2021-06, Vol.66 (1), p.29-40
Main Authors: Qin, Yangmin, Zhang, Lihua, Swindles, Graeme T., Yang, Huan, Gu, Yansheng, Qi, Shihua
Format: Article
Language:English
Subjects:
Amoeba
Climate Change
Dam construction
Dams
Data
Difflugia
Dolphins
Earth and Environmental Science
Earth Sciences
Economic analysis
Economic development
Economic growth
Economics
Elaphurus davidianus
Environmental changes
Environmental effects
Environmental protection
Environmental restoration
Eutrophication
Floods
Freshwater
Freshwater & Marine Ecology
GDP
Geology
Gross Domestic Product
Human populations
Hydrology
Industrial areas
Inland water environment
Laboratories
Lakes
Marine mammals
Mineral nutrients
Neophocaena phocaenoides asiaeorientalis
Nutrient status
Nutrients
Organic matter
Original Paper
Paleontology
Physical Geography
Pigments
Remote sensing
Restoration
Rivers
Sedimentology
Sediments
Trophic state
Water area
Water pollution
Water quality
Water supply
Waterfowl
Wetlands
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Summary:We present a ~ 40–year record of environmental change in the Swan Oxbow, Yangtze River, China, inferred from testate amoeba and sedimentary pigment data, combined with remote sensing and analysis of local socio–economic growth. These data indicate there were several distinct phases of aquatic conditions linked to human activities in the region: (1) Between ca. AD 1970 and 1984, there may have been some exchange of water and organic matter between the Swan Oxbow and the main river channel, following initial hydrologic disconnection in 1972. The lake area was relatively large in the early phase after the oxbow first formed, and the trophic state generally increased during that time frame, (2) From ca. AD 1984 to 1992, the lake area was about a third smaller in size, while the human population and GDP increased about 10% and 10x, respectively, compared to values in 1975. The nutrient status (inferred from testate amoeba and pigment data) increased, owing to the greater discharge of nutrients and separation of the Swan Oxbow from the main Yangtze River, which reduced water supply and increased sedimentation in the oxbow, (3) From ca. AD 1992 to 2003, the lake continued to diminish in size, to an area
ISSN:0921-2728
1573-0417
DOI:10.1007/s10933-021-00183-z