在大陆范围内,珊瑚对灾难性海洋热浪的反应与珊瑚总覆盖率的变化脱钩。

IF 3.8 1区 生物学 Q1 BIOLOGY
Camille Mellin, Rick D Stuart-Smith, Freddie Heather, Elizabeth Oh, Emre Turak, Graham J Edgar
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引用次数: 0

摘要

世界珊瑚礁提供的服务正受到日益频繁和严重的海洋热浪的威胁。热浪导致的珊瑚礁退化通常是通过珊瑚总覆盖率的下降程度推断出来的,但这忽略了珊瑚类群在对热应力的易感性和反应方面的极端差异。在此,我们利用 2016 年大规模白化事件前后 404 个珊瑚类群的生态调查数据,对澳大利亚周围 262 个热带浅礁地点的珊瑚覆盖率变化进行了大陆尺度的评估。沿着大尺度环境梯度的珊瑚群落组成具有很强的空间结构,这在很大程度上决定了珊瑚群落如何应对热应力。热应力变量是预测珊瑚总覆盖率变化的最佳指标,而热浪前的群落组成则是预测时间β多样性指数(群落组成随时间变化的指标)的最佳指标。每个珊瑚群落中的指示性分类群在热浪前后都有所不同,这突显了气候驱动的珊瑚白化的潜在赢家和输家。我们的研究结果表明,仅评估总覆盖率的变化可能会掩盖群落结构中截然不同的反应,其中一些反应表现出很强的区域一致性,并可能为珊瑚礁在气候变暖的未来如何重组提供一个有说服力的前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Coral responses to a catastrophic marine heatwave are decoupled from changes in total coral cover at a continental scale.

The services provided by the world's coral reefs are threatened by increasingly frequent and severe marine heatwaves. Heatwave-induced degradation of reefs has often been inferred from the extent of the decline in total coral cover, which overlooks extreme variation among coral taxa in their susceptibility and responses to thermal stress. Here, we provide a continental-scale assessment of coral cover changes at 262 shallow tropical reef sites around Australia, using ecological survey data on 404 coral taxa before and after the 2016 mass bleaching event. A strong spatial structure in coral community composition along large-scale environmental gradients largely dictated how coral communities responded to heat stress. While heat stress variables were the best predictors of change in total coral cover, the pre-heatwave community composition best predicted the temporal beta-diversity index (an indicator of change in community composition over time). Indicator taxa in each coral community differed before and after the heatwave, highlighting potential winners and losers of climate-driven coral bleaching. Our results demonstrate how assessment of change in total cover alone may conceal very different responses in community structure, some of which showed strong regional consistency, and may provide a telling outlook of how coral reefs may reorganize in a warmer future.

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来源期刊
CiteScore
7.90
自引率
4.30%
发文量
502
审稿时长
1 months
期刊介绍: Proceedings B is the Royal Society’s flagship biological research journal, accepting original articles and reviews of outstanding scientific importance and broad general interest. The main criteria for acceptance are that a study is novel, and has general significance to biologists. Articles published cover a wide range of areas within the biological sciences, many have relevance to organisms and the environments in which they live. The scope includes, but is not limited to, ecology, evolution, behavior, health and disease epidemiology, neuroscience and cognition, behavioral genetics, development, biomechanics, paleontology, comparative biology, molecular ecology and evolution, and global change biology.
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