论文标题：Acid-base adjustments and first evidence of denticle corrosion caused by ocean acidification conditions in a demersal shark species
期刊：Scientific Reports
作者：Jacqueline Dziergwa, Sarika Singh et.al
发表时间：2019/12/19
数字识别码：10.1038/s41598-019-54795-7
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《科学报告》本周发表的一项研究 Acid-base adjustments and first evidence of denticle corrosion caused by ocean acidification conditions in a demersal shark species指出，长时间暴露在高二氧化碳含量（酸化）的海水中，可能会腐蚀覆盖在埃氏宽瓣鲨皮肤表面的齿状鳞片（盾鳞）。人类活动导致海洋中CO2浓度不断增加，海洋环境日趋酸化，对其中生活的野生动植物构成了潜在影响。虽然此前已研究过酸化海水对多个物种的影响，但这是首次观察到长期暴露会腐蚀鲨鱼的盾鳞。
摘要：Global ocean acidification is expected to chronically lower the pH to 7.3 (>2200 µatm seawater pCO2) by the year 2300. Acute hypercapnia already occurs along the South African west and south coasts due to upwelling- and low-oxygen events, with increasing frequency. In the present project we investigated the impact of hypercapnia on the endemic demersal shark species Haploblepharus edwardsii. Specifically, we experimentally analysed acid-base regulation during acute and chronic hypercapnia, the effects of chronic hypercapnia on growth rates and on denticle structure- and composition. While H. edwardsiiare physiologically well adapted to acute and chronic hypercapnia, we observed, for the first time, denticle corrosion as a result of chronic exposure. We conclude that denticle corrosion could increase denticle turnover and compromise hydrodynamics and skin protection.
