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Uranium-thorium dating of coral mortality and community shift in a highly disturbed inshore reef (Weizhou Island, northern South China Sea)

机译：铀 - 钍珊瑚死亡率和社区转变在高度令人不安的境内珊瑚礁（Weizhou Island，南海）

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摘要

Inshore coral habitats are at high risk of loss due to a combination of climate warming and regional-scale human impacts. As a result, they have undergone significant declines. Direct evidence of acute and chronic disturbance on most inshore coral assemblages is limited. Long-term, periodical surveys and historical baseline data essential for effective management are lacking. Using high-precision uranium-thorium (U-Th) dating, we reconstruct a ～100-year-long history of extensive coral loss, changes in coral community structure, and a shifting baseline. The data were collected at Weizhou Island, northern South China Sea (SCS), which has highly disturbed inshore coral habitats that are typical globally. According to our U-Th dates, major coral mortalities around Weizhou Island have occurred since the 1950s, with increasing frequency and severity since the 1980s. The extensive loss of branching Acropora and collapse of coral communities with peaks around 1960, 1984, and 1998 are accompanied by a shift toward low coral cover and noncoral-dominated assemblages. Prior to this collapse, the local coral community structure sustained remarkable long-term stability over millennia. The timing of the Acropora loss and massive coral mortalities coincides with multiple acute and chronic, natural and anthropogenic disturbance events. We suggest that priority should be given to directly addressing the causes of degradation and effectively controlling chronic disturbances before attempting to restore reef ecosystems. This is probably the only way to solve the "wicked problem" of sustaining the key functions and ecosystem services of inshore coral habitats such as those of Weizhou Island, northern SCS.
机译：由于气候变暖和区域规模的人类影响的结合，腹腔珊瑚栖息地处于高损失风险。结果，它们经历了显着下降。大多数港口珊瑚组合的急性和慢性干扰的直接证据有限。缺乏长期，期刊调查和历史基线数据，以有效管理是必不可少的。使用高精度铀 - 钍（U-Th）约会，我们重建了〜100年历史悠久的广泛珊瑚损失，珊瑚群落结构的变化以及转换基线。该数据在南海北部威州岛（SCS）收集，这具有极其不安的珊瑚栖息地，这些珊瑚栖息地是全球典型的。根据我们的第U-T日期，自20世纪80年代以来，威州岛周围的主要珊瑚死亡人数发生在20世纪80年代以来的频率和严重程度。 1960年，1984年和1998年大峰的分支agropora和珊瑚群落崩溃的广泛丧失伴随着朝向低珊瑚盖和非主导组件的转变。在此崩溃之前，本地珊瑚群落结构在千年内持续了显着的长期稳定性。 Acropora损失和大规模珊瑚死亡的时间与多重急性和慢性，天然和人为干扰事件一致。我们建议优先考虑直接解决劣化的原因，并有效地控制恢复珊瑚礁生态系统的慢性干扰。这可能是解决维持近海珊瑚栖息地的关键功能和生态系统服务的“邪恶问题”，如威州岛，北部SCS的“邪恶问题”。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2203-2203|共1页
  • 作者

    T. Chen; S. Li; J. Zhao; Y. Feng;

  • 作者单位

    CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of Oceanology;

    CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of Oceanology;

    CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of Oceanology;

    CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of Oceanology;

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