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Other research product . Collection . 2013

Tomographic measurements of O. umbonatus and N. truempyi during the PETM and ETM-2 at ODP Sites 208-1262 and 208-1263

Foster, Laura C; Schmidt, Daniela N; Thomas, Ellen; Arndt, Sandra; Ridgwell, Andy;
Open Access
Published: 01 Jan 2013
Publisher: PANGAEA

Predicting the impact of ongoing anthropogenic CO2 emissions on calcifying marine organisms is complex, owing to the synergy between direct changes (acidification) and indirect changes through climate change (e.g., warming, changes in ocean circulation, and deoxygenation). Laboratory experiments, particularly on longer-lived organisms, tend to be too short to reveal the potential of organisms to acclimatize, adapt, or evolve and usually do not incorporate multiple stressors. We studied two examples of rapid carbon release in the geological record, Eocene Thermal Maximum 2 (~53.2 Ma) and the Paleocene Eocene Thermal Maximum (PETM, ~55.5 Ma), the best analogs over the last 65 Ma for future ocean acidification related to high atmospheric CO2 levels. We use benthic foraminifers, which suffered severe extinction during the PETM, as a model group. Using synchrotron radiation X-ray tomographic microscopy, we reconstruct the calcification response of survivor species and find, contrary to expectations, that calcification significantly increased during the PETM. In contrast, there was no significant response to the smaller Eocene Thermal Maximum 2, which was associated with a minor change in diversity only. These observations suggest that there is a response threshold for extinction and calcification response, while highlighting the utility of the geological record in helping constrain the sensitivity of biotic response to environmental change.

Subjects by Vocabulary

Medical Subject Headings: sense organs


Ocean Drilling Program (ODP)

Funded by
NSF| Collaborative Research: Reconstructing deep sea acidification during the Paleocene-Eocene Thermal Maximum
  • Funder: National Science Foundation (NSF)
  • Project Code: 0902959
  • Funding stream: Directorate for Geosciences | Division of Ocean Sciences
UKRI| Past records of ocean acidification - the Palaeogene hyperthermals
  • Funder: UK Research and Innovation (UKRI)
  • Project Code: NE/F017383/1
  • Funding stream: NERC
European Light Sources Activities - Synchrotrons and Free Electron Lasers
  • Funder: European Commission (EC)
  • Project Code: 226716
  • Funding stream: FP7 | SP4 | INFRA
Related to Research communities
European Marine Science