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Qin, Yangmin

Nom
Qin, Yangmin
Affiliation principale
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https://libra.unine.ch/handle/123456789/378

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  • Publication
    Métadonnées seulement
    Ecology of testate amoebae in peatlands of central China and development of a transfer function for paleohydrological reconstruction
    (2013)
    Qin, Yangmin 
    ;
    Mitchell, Edward 
    ;
    Lamentowicz, Mariusz
    ;
    Payne, Richard J.
    ;
    Lara, Enrique 
    ;
    Gu, Yansheng
    ;
    Huang, Xianyu
    ;
    Wang, Hongmei
    Testate amoebae are a diverse and abundant group of protozoa that constitute a large proportion of biomass in many ecosystems and probably fill important roles in ecosystem function. These microorganisms have attracted the interest of paleoecologists because the preserved shells of testate amoebae and their known hydrological preferences enable reconstruction of past hydrological change. In ombrotrophic peatlands, surface wetness reflects hydroclimate, so testate amoebae can play an important role in reconstruction of Holocene climate change. Previous studies, however, have been geographically restricted, mostly to North America and Europe. We studied the ecology of testate amoebae in peatlands from central China in relation to hydrology, pH and metal concentrations. We found that testate amoeba community structure was correlated with depth to water table (DWT) and that the hydrological preferences of species generally matched those of previous studies. We developed a weighted average DWT transfer function that enables prediction of water table depth with a cross-validated mean error of < 5 cm. Our results demonstrate the potential for using testate amoebae to reconstruct paleohydrology in China. Such studies could contribute to our understanding of Holocene climate changes in China, particularly regarding past Asian monsoon activity.
  • Publication
    Métadonnées seulement
    Relationships between testate amoeba communities and water quality in Lake Donghu, a large alkaline lake in Wuhan, China
    (2013)
    Qin, Yangmin 
    ;
    Fournier, Bertrand 
    ;
    Lara, Enrique 
    ;
    Gu, Yansheng
    ;
    Wang, Hongmei
    ;
    Cui, Yongde
    ;
    Zhang, Xiaoke
    ;
    Mitchell, Edward 
    The middle Yangtze Reach is one of the most developed regions of China. As a result, most lakes in this area have suffered from eutrophication and serious environmental pollution during recent decades. The aquatic biodiversity in the lakes of the area is thus currently under significant threat from continuous human activities. Testate amoebae (TA) are benthic (rarely planktonic) microorganisms characterized by an agglutinated or autogenous shell. Owing to their high abundance, preservation potential in lacustrine sediments, and distinct response to environmental stress, they are increasingly used as indicators for monitoring water quality and reconstructing palaeoenvironmental changes. However this approach has not yet been developed in China. This study presents an initial assessment of benthic TA assemblages in eight lakes of Lake Donghu in the region of Wuhan, China. Testate amoeba community structure was most strongly correlated to water pH. In more alkaline conditions, communities were dominated by Centropyxis aculeata, Difflugia oblonga, Pontigulasia compressa, Pon. elisa and Lesquereusia modesta. These results are consistent with previous studies and show that TA could be useful for reconstructing past water pH fluctuations in China. To achieve this, the next step will be to expand the database and build transfer function models.
  • Publication
    Accès libre
    Relationships between testate amoeba communities and water quality in Lake Donghu, a large alkaline lake in Wuhan, China
    Qin, Yangmin 
    ;
    Fournier, Bertrand 
    ;
    Lara, Enrique 
    ;
    Gu, Yansheng
    ;
    Wang, Hongmei
    ;
    Cui, Yongde
    ;
    Zhang, Xiaoke
    ;
    Mitchell, Edward 
    The middle Yangtze Reach is one of the most developed regions of China. As a result, most lakes in this area have suffered from eutrophication and serious environmental pollution during recent decades. The aquatic biodiversity in the lakes of the area is thus currently under significant threat from continuous human activities. Testate amoebae (TA) are benthic (rarely planktonic) microorganisms characterized by an agglutinated or autogenous shell. Owing to their high abundance, preservation potential in lacustrine sediments, and distinct response to environmental stress, they are increasingly used as indicators for monitoring water quality and reconstructing palaeoenvironmental changes. However this approach has not yet been developed in China. This study presents an initial assessment of benthic TA assemblages in eight lakes of Lake Donghu in the region of Wuhan, China. Testate amoeba community structure was most strongly correlated to water pH. In more alkaline conditions, communities were dominated by Centropyxis aculeata, Difflugia oblonga, Pontigulasia compressa, Pon. elisa and Lesquereusia modesta. These results are consistent with previous studies and show that TA could be useful for reconstructing past water pH fluctuations in China. To achieve this, the next step will be to expand the database and build transfer function models.