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首页> 外文期刊>Marine biology >Use of skeletal Sr/Ca ratios to determine growth patterns in a branching coral Isopora palifera
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Use of skeletal Sr/Ca ratios to determine growth patterns in a branching coral Isopora palifera

机译：利用骨骼中的Sr / Ca比值确定分支珊瑚Isopora palifera的生长方式

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Studies on the growth response of corals to changing climate have largely focused on long-lived corals with relatively distinct density bands such as massive Porites corals. Little is known about the climatic response of other more abundant growth forms, such as branching Acropora corals, largely because of the absence of a clear annual density banding pattern. Using a combination of X-radiography, gamma densitometry, Sr/Ca analysis, and Uranium-Thorium (U-Th) dating, we quantified patterns of annual growth in the robust branching coral Isopora palifera from the central Great Barrier Reef (GBR), Australia (18 degrees 16' S 147 degrees 22' E) collected in May 2013. While visual analysis of the positive X-radiographs revealed alternating patterns of high-and low-density bands along the central growth axis, gamma-densitometry analysis suggests that these bands do not exhibit a clear annual cycle. In contrast, skeletal Sr/Ca ratios consistently revealed clear patterns of seasonality matching local sea surface temperatures (SST), and provided a growth chronology to calculate linear extension rate, skeletal density and calcification rate. Comparisons between SST-Sr/Ca calibrations derived from our I. palifera samples with (i) massive Porites from the same location and (ii) Isopora spp. from the GBR and Papua New Guinea revealed significant differences of up to 3.5 degrees C, implying palaeoclimate reconstructions should use site-specific and species-specific Sr/Ca-SST calibrations. Our approach provides a robust method for assessing changes in growth for a common Indo-Pacific branching coral, and provides a valuable framework for quantifying past and future changes in skeletal growth in response to climate change.
机译：关于珊瑚对气候变化的生长响应的研究主要集中在密度带相对不同的长寿命珊瑚，例如大量的Porites珊瑚。人们对其他更丰富的生长形式，例如分支的Acropora珊瑚的气候反应知之甚少，这在很大程度上是由于缺乏清晰的年密度带状分布。通过X射线照相，伽马密度法，Sr / Ca分析和铀U（U-Th）测年相结合，我们量化了来自大堡礁（GBR）中心的健壮分支珊瑚Isopora palifera的年生长模式，澳大利亚（2013年5月收集了18度16'S 147度22'E）。虽然对正X射线照相的视觉分析显示了沿中心生长轴的高密度带和低密度带的交替模式，但伽玛密度分析表明这些乐队没有清晰的年度周期。相反，骨骼的Sr / Ca比值始终显示出与当地海表温度（SST）相匹配的清晰季节性特征，并提供了生长年表来计算线性延伸率，骨骼密度和钙化率。从我们的I. palifera样品中获得的SST-Sr / Ca校准品与（i）来自同一位置的大量多孔陶瓷和（ii）Isopora spp之间的比较。来自GBR和巴布亚新几内亚的数据显示高达3.5摄氏度的显着差异，这意味着古气候重建应使用特定地点和特定物种的Sr / Ca-SST校准。我们的方法为评估常见的印度洋-太平洋分枝珊瑚的生长变化提供了一种可靠的方法，并为量化过去和未来骨骼生长响应气候变化的变化提供了有价值的框架。

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  • 来源
    《Marine biology》 |2017年第4期|96.1-96.15|共15页
  • 作者

    Razak Tries B.; Mumby Peter J.; Nguyen Ai D.; Zhao Jian-Xin; Lough Janice M.; Cantin Neal E.; Roff George;

  • 作者单位

    Univ Queensland, Sch Biol Sci, Marine Spatial Ecol Lab, St Lucia, Qld 4072, Australia|Univ Queensland, Australian Res Council Ctr Excellence Coral Reef, St Lucia, Qld 4072, Australia;

    Univ Queensland, Sch Biol Sci, Marine Spatial Ecol Lab, St Lucia, Qld 4072, Australia|Univ Queensland, Australian Res Council Ctr Excellence Coral Reef, St Lucia, Qld 4072, Australia;

    Univ Queensland, Sch Earth & Environm Sci, St Lucia, Qld 4072, Australia;

    Univ Queensland, Sch Earth & Environm Sci, St Lucia, Qld 4072, Australia;

    Australian Inst Marine Sci, PMB 3 Townsville MC, Townsville, Qld 4810, Australia;

    Australian Inst Marine Sci, PMB 3 Townsville MC, Townsville, Qld 4810, Australia;

    Univ Queensland, Sch Biol Sci, Marine Spatial Ecol Lab, St Lucia, Qld 4072, Australia|Univ Queensland, Australian Res Council Ctr Excellence Coral Reef, St Lucia, Qld 4072, Australia;

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