Ocean acidification promotes otolith growth and calcite deposition in gilthead sea bream (Sparus aurata) larvae

Clara Coll-Lladó, Jan Giebichenstein, Paul B. Webb, Christopher R. Bridges, Daniel Garcia de la Serrana

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The effects of ocean acidification on otolith crystallization and growth rates were investigated in gilthead sea bream (Sparus aurata) larvae. Larvae were exposed to three different pH levels: pH8.2, pH7.7 and pH7.3 for a period of 18 days post-fertilization. For the first time, we demonstrate that pH has a significant impact on the carbonate polymorph composition, showing calcite in a significant percentage of individuals at low pH. Around 21% of the larvae exposed to pH7.3 showed irregular calcitic otoliths rather than commonly found round aragonitic otoliths. Calcitic otoliths showed a moderate level of heritability suggesting an important role of genetic factors. We also observed significantly larger otoliths in larvae reared at pH7.7 and pH7.3 compared to pH8.2 in both sagittae and lapilli. Our results demonstrate that otolith growth rates in gilthead sea bream larvae increase at low pH while a significant proportion of larvae are prone to the formation of calcitic otoliths at pH7.3.
Original languageEnglish
Article number8384
Number of pages10
JournalScientific Reports
Volume8
Early online date30 May 2018
DOIs
Publication statusE-pub ahead of print - 30 May 2018

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