Biogeochemical significance of pelagic ecosystem function: An end-cretaceous case study

Michael J. Henehan*, Pincelli M. Hull, Donald E. Penman, James W B Rae, Daniela N. Schmidt

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

37 Citations (Scopus)
327 Downloads (Pure)

Abstract

Pelagic ecosystem function is integral to global biogeochemical cycling, and plays a major role in modulating atmospheric CO2 concentrations (pCO2). Uncertainty as to the effects of human activities on marine ecosystem function hinders projection of future atmospheric pCO2. To this end, events in the geological past can provide informative case studies in the response of ecosystem function to environmental and ecological changes. Around the Cretaceous-Palaeogene (K-Pg) boundary, two such events occurred: Deccan large igneous province (LIP) eruptions and massive bolide impact at the Yucatan Peninsula. Both perturbed the environment, but only the impact coincided with marine mass extinction. As such, we use these events to directly contrast the response of marine biogeochemical cycling to environmental perturbation with and without changes in global species richness. We measure this biogeochemical response using records of deepsea carbonate preservation. We find that Late Cretaceous Deccan volcanism prompted transient deep-sea carbonate dissolution of a larger magnitude and timescale than predicted by geochemical models. Even so, the effect of volcanism on carbonate preservation was slight compared with bolide impact. Empirical records and geochemical models support a pronounced increase in carbonate saturation state for more than 500 000 years following the mass extinction of pelagic carbonate producers at the K-Pg boundary. These examples highlight the importance of pelagic ecosystems in moderating climate and ocean chemistry.

Original languageEnglish
Article number20150510
Number of pages10
JournalPhilosophical Transactions B: Biological Sciences
Volume371
Issue number1694
Early online date25 Apr 2016
DOIs
Publication statusPublished - 19 May 2016

Keywords

  • Biogeochemical cycling
  • Bolide impact
  • Cretaceous-Palaeogene extinction
  • Ecosystem function
  • LOSCAR
  • Mass extinction

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