Acid-base adjustments and first evidence of denticle corrosion caused by ocean acidification conditions in a demersal shark species.
Sci Rep
; 9(1): 18668, 2019 12 19.
Article
em En
| MEDLINE
| ID: mdl-31857600
ABSTRACT
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. 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.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Água do Mar
/
Tubarões
/
Equilíbrio Ácido-Base
/
Calcificações da Polpa Dentária
Limite:
Animals
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article