The Xiamen Symposium on Marine Environmental Sciences (XMAS 2025)

The number of studies investigating the effects of ocean acidification on marine organisms and communities increases every year. Results are not easily comparable since the carbonate chemistry and ancillary data are not always reported in similar units and scales and are not calculated using similar sets of constants. To facilitate data comparison, a data compilation hosted by the PANGAEA Data Publisher was initiated by the European Network of Excellence for Ocean Ecosystems Analysis (EUR-OCEANS) and the first large-scale European Project on Ocean Acidification (EPOCA) in 2008. It has been maintained within the framework of the International Atomic Energy Agency (IAEA) Ocean Acidification International Coordination Centre (OA-ICC) in collaboration with Xiamen University and the Villefranche Oceanographic Laboratory, France, since 2013. By November 2023, a total of 1501 datasets (over 25 million data points) from 1554 papers had been archived. To easily filter and access relevant biological response data from this compilation, a user-friendly portal (https://oa-icc.ipsl.fr) was launched in 2018. Most of the study sites from which data have been archived are in the North Atlantic Ocean, North Pacific Ocean, South Pacific Ocean, and Mediterranean Sea, while polar oceans are still relatively poorly represented. Mollusca and Cnidaria are still the best-represented taxonomic groups. The biological processes most reported in the datasets are growth and morphology. Other variables that can potentially be affected by ocean acidification and are often reported include calcification/dissolution, primary production/photosynthesis, and biomass/abundance. The majority of the compiled datasets have considered ocean acidification as a single stressor, but their relative contribution has decreased from 68% before 2015 to 57% today, showing a clear tendency towards more data archived from multifactorial studies.

ocean acidification, data collection, biological