Marine bivalve shell geochemistry and ultrastructure from modern low pH environments: environmental effect versus experimental bias
Marine bivalve shell geochemistry and ultrastructure from modern low pH environments: environmental effect versus experimental bias
复制标题
DOI：
10.5194/bg-9-1897-2012
复制
发表时间：
2012-01-01
期刊：
影响因子：
4.9
通讯作者：
Immenhauser, A.
中科院分区：
文献类型：
--
作者：
Hahn, S.;Rodolfo-Metalpa, R.;Immenhauser, A.
双壳类贝壳可以很好地记录过去的环境变化，但还没有被用来解释海洋酸化事件。本文研究了贻贝不同壳层的碳、氧和微量元素记录，并对贝壳的超微结构进行了详细的研究。来自意大利地中海伊斯基亚港的贻贝被移植到该岛东海岸二氧化碳喷口附近平均PHT 7.3和平均PHT 8.1的水中生长。最突出的是，贝壳记录了移植带来的冲击，包括贝壳的超微结构、质地和地球化学记录。随后在酸化海水中沉淀的贝壳方解石通过部分扰乱的超微结构对pH梯度做出反应。所有试验点的地球化学数据都显示出强烈的代谢效应，超过了低pH环境的影响。这些现场实验表明，在解释潜在的海洋酸化信号时需要谨慎，因为各种参数会影响贝壳化学和超微结构。除了代谢过程外，海水pH值、盐度、水温、食物可获得性和种群密度等因素都会影响生物成因碳酸盐贝壳档案。
Bivalve shells can provide excellent archives of past environmental change but have not been used to interpret ocean acidification events. We investigated carbon, oxygen and trace element records from different shell layers in the mussels Mytilus galloprovincialis combined with detailed investigations of the shell ultrastructure. Mussels from the harbour of Ischia (Mediterranean, Italy) were transplanted and grown in water with mean pHT 7.3 and mean pHT 8.1 near CO2 vents on the east coast of the island. Most prominently, the shells recorded the shock of transplantation, both in their shell ultrastructure, textural and geochemical record. Shell calcite, precipitated subsequently under acidified seawater responded to the pH gradient by an in part disturbed ultrastructure. Geochemical data from all test sites show a strong metabolic effect that exceeds the influence of the low-pH environment. These field experiments showed that care is needed when interpreting potential ocean acidification signals because various parameters affect shell chemistry and ultrastructure. Besides metabolic processes, seawater pH, factors such as salinity, water temperature, food availability and population density all affect the biogenic carbonate shell archive.