Hidden Loss of Wetlands in China.

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Xu, Weihua

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Fan, Xinyue

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Ma, Jungai

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Pimm, Stuart L

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Kong, Lingqiao

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Zeng, Yuan

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Li, Xiaosong

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Xiao, Yi

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Zheng, Hua

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Liu, Jianguo

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Wu, Bingfang

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An, Li

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Zhang, Lu

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Wang, Xiaoke

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Ouyang, Zhiyun

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2021-08-02T16:59:05Z

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2021-08-02T16:59:05Z

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2019-09

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2021-08-02T16:58:59Z

dc.description.abstract

To counter their widespread loss, global aspirations are for no net loss of remaining wetlands [1]. We examine whether this goal alone is sufficient for managing China's wetlands, for they constitute 10% of the world's total. Analyzing wetland changes between 2000 and 2015 using 30-m-resolution satellite images, we show that China's wetlands expanded by 27,614 km2 but lost 26,066 km2-a net increase of 1,548 km2 (or 0.4%). This net change hides considerable complexities in the types of wetlands created and destroyed. The area of open water surface increased by 9,110 km2, but natural wetlands-henceforth "marshes"-decreased by 7,562 km2. Of the expanded wetlands, restoration policies contributed 24.5% and dam construction contributed 20.8%. Climate change accounted for 23.6% but is likely to involve a transient increase due to melting glaciers. Of the lost wetlands, agricultural and urban expansion contributed 47.7% and 13.8%, respectively. The increase in wetlands from conservation efforts (6,765 km2) did not offset human-caused wetland losses (16,032 km2). The wetland changes may harm wildlife. The wetland loss in east China threatens bird migration across eastern Asia [2]. Open water from dam construction flooded the original habitats of threatened terrestrial species and affected aquatic species by fragmenting wetland habitats [3]. Thus, the "no net loss" target measures total changes without considering changes in composition and the corresponding ecological functions. It may result in "paper offsets" and should be used carefully as a target for wetland conservation.

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S0960-9822(19)30933-9

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0960-9822

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1879-0445

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https://hdl.handle.net/10161/23522

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eng

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Elsevier BV

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Current biology : CB

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10.1016/j.cub.2019.07.053

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Animals

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Humans

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Conservation of Natural Resources

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Ecosystem

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Biodiversity

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Agriculture

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China

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Wetlands

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Endangered Species

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Climate Change

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Satellite Imagery

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Environmental Restoration and Remediation

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Hidden Loss of Wetlands in China.

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Journal article

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Pimm, Stuart L|0000-0003-4206-2456

pubs.begin-page

3065

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3071.e2

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18

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Nicholas School of the Environment

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Environmental Sciences and Policy

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Duke Science & Society

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Duke

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Initiatives

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Institutes and Provost's Academic Units

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Published

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29

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