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Acid-base adjustments and first evidence of denticle corrosion caused by ocean acidification conditions in a demersal shark species

Article scientifique 2019 Anglais

Résumé

) 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. edwardsii are 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.

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Dziergwa, J., Singh, S., Bridges, C., Kerwath, S., Enax, J., Auerswald, L. (2019). Acid-base adjustments and first evidence of denticle corrosion caused by ocean acidification conditions in a demersal shark species. https://doi.org/10.1038/s41598-019-54795-7

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Auteur(s)

Jacqueline Dziergwa Sarika Singh Christopher R. Bridges Sven Kerwath Joachim Enax Lutz Auerswald

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