Sponge bioerosion accelerated by ocean acidification across species and latitudes?

In many marine biogeographic realms, bioeroding sponges dominate the internal bioerosion of calcareous substrates such as mollusc beds and coral reef framework. They biochemically dissolve part of the carbonate and liberate so-called sponge chips, a process that is expected to be facilitated and accelerated in a more acidic environment inherent to the present global change. The bioerosion capacity of the demosponge Cliona celata Grant, 1826 in subfossil oyster shells was assessed via alkalinity anomaly technique based on 4 days of experimental exposure to three different levels of carbon dioxide partial pressure (pCO2) at ambient temperature in the cold-temperate waters of Helgoland Island, North Sea. The rate of chemical bioerosion at present-day pCO2 was quantified with 0.08-0.1 kg/m**2/year. […]

在众多海洋生物地理区域内，生物侵蚀海绵占据了诸如贝类床和珊瑚礁骨架等碳酸盐基质的内部生物侵蚀的主导地位。它们通过生物化学作用溶解部分碳酸盐，释放所谓的海绵碎片，这一过程在目前全球变化所固有的酸性环境中预计将得到促进和加速。通过对冷温带海域赫尔戈兰岛海水环境中不同二氧化碳分压（pCO2）水平下，为期四天的实验暴露，采用碱度异常技术评估了化石牡蛎壳中 demosponge Cliona celata Grant, 1826 的生物侵蚀能力。在当前二氧化碳分压水平下，化学生物侵蚀速率量化为0.08-0.1千克/平方米/年。