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Unravelling Marine Benthic Functioning Shifts Under Ocean Acidification.

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Ocean acidification alters marine biodiversity and ecosystem functions. Declining pH decreased biomass and calcification but increased photosynthesis and nutrient uptake in coastal ecosystems.

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Area of Science:

  • Marine Biology
  • Oceanography
  • Ecology

Background:

  • Increasing atmospheric CO2 causes ocean acidification (OA), impacting marine biodiversity.
  • The effects of OA on community-level ecosystem functions like calcification, primary production, and nutrient uptake are not well understood.

Purpose of the Study:

  • To assess the impact of declining pH on marine community species composition, biomass, and ecosystem processes.
  • To understand how OA-induced biodiversity loss reshapes marine coastal ecosystems.

Main Methods:

  • Community transplant experiments were conducted at natural CO2 vents.
  • In situ measurements of ecosystem functioning were performed over time.

Main Results:

  • Declining pH led to significant shifts in community species composition.
  • Biomass and calcification rates decreased under lower pH conditions.
  • Photosynthesis and nutrient uptake rates increased with declining pH.

Conclusions:

  • Ocean acidification reshapes the structure and function of temperate marine coastal ecosystems.
  • OA-induced biodiversity loss has profound effects on key ecosystem processes.