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Area of Science:

  • Marine biology
  • Oceanography
  • Climate change science

Background:

  • Ocean acidification, driven by rising carbon dioxide (CO2), impacts marine calcifiers.
  • Biologically induced carbonate dissolution (bioerosion) is a critical process often overlooked in acidification studies.
  • Sponges are significant bioeroders, with species like Cliona orientalis posing a threat to coral health.

Purpose of the Study:

  • To investigate the effect of elevated carbon dioxide partial pressure (pCO2) on the bioerosion capacity of the sponge Cliona orientalis.
  • To assess the implications of altered bioerosion rates for coral reef ecosystems under future ocean conditions.

Main Methods:

  • Experimental exposure of Cliona orientalis to varying levels of pCO2, simulating future ocean acidification scenarios.
  • Quantification of bioerosion rates under different pCO2 conditions.

Main Results:

  • Increased pCO2 significantly enhanced the bioerosion capacity of Cliona orientalis.
  • Higher acidity levels correlated with accelerated chemical bioerosion by the sponge.
  • Sponges demonstrate a facilitated bioerosion process in high-CO2 environments.

Conclusions:

  • The study highlights a dual threat to coral reefs: reduced coral calcification and increased sponge bioerosion.
  • Accelerated bioerosion by sponges like Cliona orientalis exerts critical pressure on the carbonate balance of reef ecosystems.
  • Tropical reef ecosystems face significant challenges due to the combined effects of ocean acidification on calcification and bioerosion.