Drivers and Changes of the Poyang Lake Wetland Ecosystem

Wang, Yuyu; Molinos, Jorge García; Shi, Linlu; Zhang, Min; Wu, Ziran; Zhang, Huan; Xu, Jun

doi:10.1007/s13157-019-01180-9

“…Lakes are essential to ecosystems at regional scales related to water resources, utilization of water resources, and communities of plants and animals in the wetland [1]. Water level fluctuation (WLF) associated with depth regulates the structure and functioning of shallow lakes, including habitat structure, primary producers, benthic consumers, and macrophyte vegetation, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, some research revealed that TGD impoundment weakened the river forcing on the natural lake and reduced the water level of Poyang Lake in autumn under similar precipitation conditions [8]. However, other researchers hold the opposite view that the declining trend exhibited in lakes of the middle Yangtze River since the 2000s was affected less by precipitation than by TGD regulations [1]. Despite many efforts to analyze the causes of water level variation in natural lakes interrelated and interacted with the Yangtze River, most studies focused on the influence of TGD regulation, reclamation and climate change on Poyang Lake and Dongting Lake, while few of them paid close attention to floodgate-controlled shallow lakes, which take up 60% of the total lake area in the middle and lower reaches of Yangtze River area in China [3].…”

Section: Introductionmentioning

confidence: 99%

Water Level Fluctuation under the Impact of Lake Regulation and Ecological Implication in Huayang Lakes, China

Zhai

¹

,

Zhong

²

,

Li

³

et al. 2020

Water

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Water level fluctuation (WLF) in shallow lakes in the middle and lower reaches of the Yangtze River has been a concern of many researchers. This work aims to investigate the effects of climate change and regulation of floodgates and the Three Gorges Dam (TGD) on WLF and lake volume in Huayang Lakes during the past 52 years. The results revealed that precipitation is the dominant factor that leads to seasonal variation of lake levels, whereas regulation of floodgates and TGD are the key drivers of hydrology regime change in the past 20 years. Natural lake regime has higher water level when there is more precipitation and less lake volume. Floodgates and TGD regulations have changed this pattern since 2003, causing less difference in water level in spite of more precipitation and lake recession. Under the combined impacts of floodgates and TGD regulations, Huayang Lakes have experienced a prolonged outflow time since 2003 and the contribution rate caused by the floodgates and TGD regulations has increased by 19.90%. Additionally, the water level of Huayang Lakes decreased by approximately 0.3~0.5 m from September to November, but it showed no alteration from January to March in the past two decades. This indicated that floodgate regulations used for agricultural irrigation and fishery culture dominate the hydrology regime in winter and early spring. This study is beneficial for aquatic ecosystem protection in floodgate-controlled lakes under the circumstance of climate change and vigorous anthropology activities.

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“…Even though we find that our results are robust with respect to changes at the population-level, other factors may also account for the population demographic and genetic characteristics. For instance, it should be noted that past drought events related to climate anomalies, water overexploitation or habitat alteration (e.g., Three Gorges Dam) have dramatically affected Poyang Lake biodiversity (Zhang et al, 2015;Wang et al, 2019). Environmental ''bottlenecks'' associated to drought conditions may create a new wave front where strong genetic drift may be assumed to be the main mechanism of genetic differentiation among populations (Peischl & Excoffier, 2015).…”

Section: Effect Of Human Activity On Genetics Diversity and Structurementioning

confidence: 99%

Demographic and genetic characterization of harvestedCorbicula flumineapopulations

Wang

¹

,

Liu

²

,

Ferreira‐Rodríguez

³

et al. 2020

PeerJ

0

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The freshwater clam Corbicula fluminea s.l. is an edible freshwater bivalve of economic value in Asia. The species has been particularly well studied in the invaded range. However, there is a lack of knowledge in its native range where it supports an increasing commercial harvest pressure. Among Asiatic countries, China accounts for 70% of known commercial harvest and aquaculture production. We aim to characterize here wild C. fluminea s.l populations exposed to commercial harvest pressure in Poyang Lake Basin. We found higher biomass, density and genetic diversity in lake populations compared to peripheral populations (i.e., lake tributaries). Given that lake habitats support more intense harvest pressure than peripheral habitats, we suggest that demographic and genetic differentiation among subpopulations may be influenced in some degree by different harvest pressure. In this regard, additional demographic and/or genetic changes related to increasing harvest pressure may place population at a higher risk of extirpation. Altogether, these results are especially relevant for maintaining populations at or above viable levels and must be considered in order to ensure the sustainability of the resource.

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“…Manuscript to be reviewed Poyang Lake biodiversity (Zhang et al, 2015;Wang et al, 2019). Environmental "bottlenecks" associated to drought conditions may create a new wave front where strong genetic drift may be assumed to be the main mechanism of genetic differentiation among populations (Peischl & Excoffier, 2015).…”

Section: Effect Of Human Activity On Genetics Diversity and Structurementioning

confidence: 99%

Peer Review #3 of "Demographic and genetic characterization of harvested Corbicula fluminea populations (v0.1)"

2020

1

0

View full text Add to dashboard Cite

The freshwater clam Corbicula fluminea s.l. is an edible freshwater bivalve of economic value in Asia. The species has been particularly well studied in the invaded range. However, there is a lack of knowledge in its native range where it supports an increasing commercial harvest pressure. Among Asiatic countries, China accounts for 70% of known commercial harvest and aquaculture production. We aim to characterize here wild C. fluminea s.l populations exposed to commercial harvest pressure in Poyang Lake Basin. We found higher biomass, density and genetic diversity in lake populations compared to peripheral populations (i.e., lake tributaries). Given that lake habitats support more intense harvest pressure than peripheral habitats, we suggest that demographic and genetic differentiation among subpopulations may be influenced in some degree by different harvest pressure. In this regard, additional demographic and/or genetic changes related to increasing harvest pressure may place population at a higher risk of extirpation. Altogether, these results are especially relevant for maintaining populations at or above viable levels and must be considered in order to ensure the sustainability of the resource.

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Drivers and Changes of the Poyang Lake Wetland Ecosystem

Cited by 38 publications

References 52 publications

Water Level Fluctuation under the Impact of Lake Regulation and Ecological Implication in Huayang Lakes, China

Water Level Fluctuation under the Impact of Lake Regulation and Ecological Implication in Huayang Lakes, China

Demographic and genetic characterization of harvestedCorbicula flumineapopulations

Peer Review #3 of "Demographic and genetic characterization of harvested Corbicula fluminea populations (v0.1)"

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