Near-future pH conditions severely impact calcification, metabolism and the nervous system in the pteropod Heliconoides inflatus

Aurelie Moya, Ella L. Howes, Thomas Lacoue-Labarthe, Sylvain Forêt, Bishoy Hanna, Mónica Medina, Philip L. Munday, Jue Sheng Ong, Jean Louis Teyssié, Gergely Torda, Sue Ann Watson, David J. Miller, Jelle Bijma, Jean Pierre Gattuso

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

Shelled pteropods play key roles in the global carbon cycle and food webs of various ecosystems. Their thin external shell is sensitive to small changes in pH, and shell dissolution has already been observed in areas where aragonite saturation state is ~1. A decline in pteropod abundance has the potential to disrupt trophic networks and directly impact commercial fisheries. Therefore, it is crucial to understand how pteropods will be affected by global environmental change, particularly ocean acidification. In this study, physiological and molecular approaches were used to investigate the response of the Mediterranean pteropod, Heliconoides inflatus, to pH values projected for 2100 under a moderate emissions trajectory (RCP6.0). Pteropods were subjected to pHT 7.9 for 3 days, and gene expression levels, calcification and respiration rates were measured relative to pHT 8.1 controls. Gross calcification decreased markedly under low pH conditions, while genes potentially involved in calcification were up-regulated, reflecting the inability of pteropods to maintain calcification rates. Gene expression data imply that under low pH conditions, both metabolic processes and protein synthesis may be compromised, while genes involved in acid–base regulation were up-regulated. A large number of genes related to nervous system structure and function were also up-regulated in the low pH treatment, including a GABAA receptor subunit. This observation is particularly interesting because GABAA receptor disturbances, leading to altered behavior, have been documented in several other marine animals after exposure to elevated CO2. The up-regulation of many genes involved in nervous system function suggests that exposure to low pH could have major effects on pteropod behavior. This study illustrates the power of combining physiological and molecular approaches. It also reveals the importance of behavioral analyses in studies aimed at understanding the impacts of low pH on marine animals.

Original languageEnglish (US)
Pages (from-to)3888-3900
Number of pages13
JournalGlobal Change Biology
Volume22
Issue number12
DOIs
StatePublished - Dec 1 2016

All Science Journal Classification (ASJC) codes

  • Global and Planetary Change
  • Environmental Chemistry
  • Ecology
  • Environmental Science(all)

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    Moya, A., Howes, E. L., Lacoue-Labarthe, T., Forêt, S., Hanna, B., Medina, M., Munday, P. L., Ong, J. S., Teyssié, J. L., Torda, G., Watson, S. A., Miller, D. J., Bijma, J., & Gattuso, J. P. (2016). Near-future pH conditions severely impact calcification, metabolism and the nervous system in the pteropod Heliconoides inflatus. Global Change Biology, 22(12), 3888-3900. https://doi.org/10.1111/gcb.13350