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Updated: Jun 27, 2026
08:15
Visualizing Oceanographic Data to Depict Long-term Changes in Phytoplankton
Published on: July 28, 2023
Dynamic patterns and ecological impacts of declining ocean pH in a high-resolution multi-year dataset
J Timothy Wootton1, Catherine A Pfister, James D Forester
1Department of Ecology and Evolution, University of Chicago, 1101 East 57th Street, Chicago, IL 60637, USA. twootton@uchicago.edu
Summary
Ocean acidification due to rising atmospheric carbon dioxide (CO2) is rapidly decreasing ocean pH. This pH decline negatively impacts marine life, especially calcareous species, and is altering coastal benthic ecosystems.
Area of Science:
- Marine Biology
- Oceanography
- Climate Change Science
Background:
- Rising atmospheric carbon dioxide (CO2) concentrations are predicted to lower ocean pH, impacting marine ecosystems.
- Empirical data on long-term ocean pH changes and their ecological effects are limited.
Purpose of the Study:
- To document high-resolution ocean pH changes over 8 years at a north-temperate coastal site.
- To investigate the links between ocean pH variations and benthic species dynamics.
- To project the long-term ecological consequences of ocean acidification.
Main Methods:
- Collected an 8-year high-resolution dataset of ocean pH.
- Utilized multispecies Markov chain models to link environmental change to species dynamics.
- Analyzed the performance of calcareous versus noncalcareous species under varying pH conditions.
Main Results:
- Observed a decline in ocean pH correlated with increasing atmospheric CO2 levels.
- Documented substantial pH variations driven by biological and physical factors.
- Found that calcareous species performed worse than noncalcareous species in low pH conditions.
- Projected significant shifts in dominant benthic species due to direct and indirect effects of pH decline.
Conclusions:
- Ocean pH decline is occurring rapidly in some coastal areas, exceeding previous predictions.
- Ocean acidification has significant ecological consequences for nearshore benthic ecosystems.
- Both direct impacts on calcification and indirect species interactions contribute to ecosystem shifts.
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