Ocean acidification alters the otoliths of a pantropical fish species with implications for sensory function

Sean Bignami, Ian C. Enochs, Derek P. Manzello, Su Sponaugle, Robert K. Cowen

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

Ocean acidification affects a wide diversity of marine organisms and is of particular concern for vulnerable larval stages critical to population replenishment and connectivity. Whereas it is well known that ocean acidification will negatively affect a range of calcareous taxa, the study of fishes is more limited in both depth of understanding and diversity of study species. We used new 3D microcomputed tomography to conduct in situ analysis of the impact of ocean acidification on otolith (ear stone) size and density of larval cobia (Rachycentron canadum), a large, economically important, pantropical fish species that shares many life history traits with a diversity of high-value, tropical pelagic fishes. We show that 2,100 μatm partial pressure of carbon dioxide (pCO2) significantly increased not only otolith size (up to 49% greater volume and 58% greater relative mass) but also otolith density (6% higher). Estimated relative mass in 800 μatm pCO 2 treatments was 14% greater, and there was a similar but nonsignificant trend for otolith size. Using a modeling approach, we demonstrate that these changes could affect auditory sensitivity including a ∼50% increase in hearing range at 2,100 μatm pCO2, which may alter the perception of auditory information by larval cobia in a high-CO2 ocean. Our results indicate that ocean acidification has a graded effect on cobia otoliths, with the potential to substantially influence the dispersal, survival, and recruitment of a pelagic fish species. These results have important implications for population maintenance/replenishment, connectivity, and conservation efforts for other valuable fish stocks that are already being deleteriously impacted by overfishing.

Original languageEnglish
Pages (from-to)7366-7370
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume110
Issue number18
DOIs
StatePublished - Apr 30 2013

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Otolithic Membrane
Oceans and Seas
Fishes
Auditory Perception
X-Ray Microtomography
Aquatic Organisms
Partial Pressure
Carbon Dioxide
Population
Hearing
Ear
Maintenance

ASJC Scopus subject areas

  • General

Cite this

Ocean acidification alters the otoliths of a pantropical fish species with implications for sensory function. / Bignami, Sean; Enochs, Ian C.; Manzello, Derek P.; Sponaugle, Su; Cowen, Robert K.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 110, No. 18, 30.04.2013, p. 7366-7370.

Research output: Contribution to journalArticle

Bignami, Sean ; Enochs, Ian C. ; Manzello, Derek P. ; Sponaugle, Su ; Cowen, Robert K. / Ocean acidification alters the otoliths of a pantropical fish species with implications for sensory function. In: Proceedings of the National Academy of Sciences of the United States of America. 2013 ; Vol. 110, No. 18. pp. 7366-7370.
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