Effects of ocean acidification with pCO2 diurnal fluctuations on survival and larval shell formation of Ezo abalone, Haliotis discus hannai.
Mar Environ Res
; 134: 28-36, 2018 Mar.
Article
em En
| MEDLINE
| ID: mdl-29289362
ABSTRACT
This study assessed the effects of constant and diurnally fluctuating pCO2 on development and shell formation of larval abalone Haliotis discus hannai. The larvae was exposed to different pCO2 conditions; constant [450, 800, or 1200⯵atm in the first experiment (Exp. I), 450 or 780⯵atm in the second experiment (Exp. II)] or diurnally fluctuating pCO2 (800⯱â¯400 or 1200⯱â¯400⯵atm in Exp. I, 450⯱â¯80, 780⯱â¯200 or 780⯱â¯400⯵atm in Exp. II). Mortality, malformation rates or shell length of larval abalone were not significantly different among the 450, 800, and 800⯱â¯400⯵atm pCO2 treatments. Meanwhile, significantly higher malformation rates and smaller shells were detected in the 1200 and 1200⯱â¯400⯵atm pCO2 treatments than in the 450⯵atm pCO2 treatment. The negative impacts were greater in the 1200⯱â¯400⯵atm than in the 1200⯵atm. Shell length and malformation rate of larval abalone were related with aragonite saturation state (Ω-aragonite) in experimental seawater, and greatly changed around 1.1 of Ω-aragonite which corresponded to 1000-1300⯵atm pCO2. These results indicate that there is a pCO2 threshold associated with Ω-aragonite in the seawater, and that pCO2 fluctuations produce additional negative impacts on abalone when above the threshold. Clear relationships were detected between abalone fitness and the integrated pCO2 value over the threshold, indicating that the effects of OA on development and shell formation of larval abalone can be determined by intensity and time of exposure to pCO2 over the threshold.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Água do Mar
/
Dióxido de Carbono
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Gastrópodes
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Exoesqueleto
Limite:
Animals
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article