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首页> 外文期刊>Marine ecology >Structural and geochemical alterations in the Mg calcite bryozoan Myriapora truncata under elevated seawater pCO_2 simulating ocean acidification
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Structural and geochemical alterations in the Mg calcite bryozoan Myriapora truncata under elevated seawater pCO_2 simulating ocean acidification

机译：模拟海水酸化的海水pCO_2升高下方解石镁镁橄榄石苔藓虫Myriapora truncata的结构和地球化学变化

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摘要

The possible effects of ocean acidification on the calcareous skeleton of the Mediterranean bryozoan Myriapora truncata (Pallas, 1766) were studied by transplanting live and dead colonies into an area of natural volcanic CO_2 vents at Ischia (Gulf of Naples, Tyrrhenian Sea), Italy. Morphology and geochemistry were compared between colonies from normal (mean pH = 8.07, min. pH 7.95), below-normal (mean pH 7.66, min. pH 7.32) and acidic (mean pH 7.43, min. pH 6.83) conditions after colonies had been exposed in situ for 45 and 128 days. Both distal (juvenile) and proximal (adult) parts of the branches were investigated. Skeletons of live colonies in acidic pH site after 45 days of exposure were less corroded than those of dead colonies, suggesting that the organic tissues enveloping the skeleton play a protective role. Colonies remained alive at the below-normal and acidic pH sites during the 45-day experiment but corrosion was very striking after 128 days, with colonies from the acidic site showing significant loss of skeleton. Compared to the control, these colonies also had lower levels of Mg (mean 8 versus 9.5 wt% Mg) within their skeletons. Electron microprobe mapping showed Mg to be higher in the outer layers of the skeletal walls in colonies from the normal pH site. Corrosion of outer layers of the walls probably explains the lower Mg level found in colonies exposed to acidic conditions. As solubility of calcite increases with Mg content, the enrichment of Mg in outer layers of the skeleton should enhance the vulnerability of Myriapora truncata to dissolution. These findings raise concerns over the survival of bryozoans with Mg calcite skeletons in the face of predicted decreases in oceanic pH levels.
机译：通过将活的和死亡的菌落移植到意大利伊斯基亚州（那不勒斯海湾，第勒尼安海）的天然火山CO_2​​喷口区域，研究了海洋酸化对地中海苔藓苔藓虫（Mariapora truncata）的钙质骨架的可能影响（Pallas，1766）。比较菌落在正常条件下（平均pH = 8.07，最低pH 7.95），低于正常水平（平均pH 7.66，最低pH 7.32）和酸性（平均pH 7.43，最低pH 6.83）的菌落的形态和地球化学。被原位暴露45天和128天。研究了分支的远端（青少年）和近端（成人）。暴露45天后，处于酸性pH位置的活菌落的骨架比死菌落的骨架受到的腐蚀少，这表明包围骨架的有机组织起保护作用。在45天的实验过程中，菌落在低于正常值和酸性pH值的位置仍然存活，但在128天后腐蚀非常明显，来自酸性位点的菌落显示出明显的骨架损失。与对照相比，这些菌落的骨骼中的镁含量也较低（分别为8和9.5 wt％的Mg）。电子探针图谱显示，从正常pH位置开始，菌落中骨骼壁外层的Mg较高。壁外层的腐蚀可能解释了暴露于酸性条件下菌落中镁含量较低的原因。当方解石的溶解度随Mg含量的增加而增加时，骨架外层中Mg的富集应增强截短的Myriapora truncata的溶解性。这些发现引起了人们对具有方解石镁骨架的苔藓虫的存活情况的担忧，因为它们预计会导致海洋pH值下降。

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