Combined responses of primary coral polyps and their algal endosymbionts to decreasing seawater pH

Federica Scucchia, Assaf Malik, Paul Zaslansky, Hollie M. Putnam, Tali Mass

Research output: Contribution to journalArticlepeer-review


With coral reefs declining globally, resilience of these ecosystems hinges on successful coral recruitment. However, knowledge of the acclimatory and/or adaptive potential in response to environmental challenges such as ocean acidification (OA) in earliest life stages is limited. Our combination of physiological measurements, microscopy, computed tomography techniques and gene expression analysis allowed us to thoroughly elucidate the mechanisms underlying the response of early-life stages of corals, together with their algal partners, to the projected decline in oceanic pH. We observed extensive physiological, morphological and transcriptional changes in surviving recruits, and the transition to a less-skeleton/more-tissue phenotype. We found that decreased pH conditions stimulate photosynthesis and endosymbiont growth, and gene expression potentially linked to photosynthates translocation. Our unique holistic study discloses the previously unseen intricate net of interacting mechanisms that regulate the performance of these organisms in response to OA.

Original languageEnglish
Article number20210328
Pages (from-to)20210328
JournalProceedings of the Royal Society B: Biological Sciences
Issue number1953
StatePublished - 30 Jun 2021

Bibliographical note

Publisher Copyright:
© 2021 The Authors.


  • Animals
  • Anthozoa/genetics
  • Coral Reefs
  • Ecosystem
  • Hydrogen-Ion Concentration
  • Oceans and Seas
  • Seawater


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