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Patterns of magnesium content in Arctic bryozoan skeletons along a depth gradient

机译：北极苔藓动物骨骼中镁含量沿深度梯度的分布

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摘要

A growing body of evidence suggests that ocean acidification acting synergistically with ocean warming alters carbonate biomineralization in a variety of marine biota. Magnesium often substitutes for Ca in the calcite skeletons of marine invertebrates, increasing their solubility. The spatio-environmental distribution of Mg in marine invertebrates has seldom been studied, despite its importance for assessing vulnerabilities to ocean acidification. Because pH decreases with water depth, it is predicted that levels of Mg in calcite skeletons should also decrease to counteract dissolution. Such a pattern has been suggested by evidence from echi-noderms. Data on magnesium content and depth in Arctic bryozoans (52 species, 103 individuals, 150 samples) are here used to test this prediction, aided by comparison with six conceptual models explaining all possible scenarios. Analyses were based on a uniform dataset spanning more than 200 m of coastal water depth. No significant relationship was found between depth and Mg content; indeed, the highest Mg content among the analyzed taxa (8.7 % mol MgCO_3) was recorded from the deepest settings (>200 m). Our findings contrast with previously published results from echinoderms in which Mg was found to decrease with depth. The bryozoan results suggest that ocean acidification may have less impact on the studied bryozoans than is generally assumed. In the broad context, our study exemplifies quantitative testing of spatial patterns of skeletal geochemistry for predicting the biological effects of environmental change in the oceans.
机译：越来越多的证据表明，海洋酸化与海洋变暖协同作用改变了各种海洋生物群中的碳酸盐生物矿化作用。镁通常在海洋无脊椎动物的方解石骨架中替代钙，从而增加了钙的溶解度。尽管镁对评估海洋酸化脆弱性的重要性，但很少研究其在海洋无脊椎动物中的时空分布。由于pH值随水深而降低，因此可以预测方解石骨架中的Mg含量也应降低以抵消溶解。棘皮动物的证据表明了这种模式。通过与解释所有可能情景的六个概念模型进行比较，此处使用北极苔藓动物（52种，103个个体，150个样本）中镁含量和深度的数据来检验这一预测。分析基于跨越200 m以上沿海水深的统一数据集。在深度和镁含量之间没有发现显着的关系。实际上，从最深的设置（> 200 m）中记录了所分析的类群中的最高Mg含量（8.7％mol MgCO_3）。我们的发现与棘皮动物先前发表的结果相反，棘皮动物发现镁随着深度的增加而减少。苔藓虫的结果表明，海洋酸化对研究的苔藓虫的影响可能比通常假定的要小。在广泛的背景下，我们的研究例证了骨骼地球化学空间模式的定量测试，以预测海洋环境变化的生物效应。

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  • 来源
    《Polar biology》 |2013年第2期|193-200|共8页
  • 作者

    Tomasz Borszcz; Piotr Kukliriski; Paul D. Taylor;

  • 作者单位

    Institute of Oceanology, Polish Academy of Sciences, Powstaricow Warszawy 55, 81-712 Sopot, Poland;

    Institute of Oceanology, Polish Academy of Sciences, Powstaricow Warszawy 55, 81-712 Sopot, Poland,Natural History Museum, Cromwell Road, London SW7 5BD, UK;

    Natural History Museum, Cromwell Road, London SW7 5BD, UK;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    magnesium; depth; bryozoans; ocean acidification; ocean warming; arctic;

    机译：镁;深度;苔藓虫海洋酸化;海洋变暖;北极;

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