Impact of the Late Triassic mass extinction on functional diversity and composition of marine ecosystems

Alexander M. Dunhill, William J. Foster, James Sciberras, Richard J. Twitchett

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Mass extinctions have profoundly influenced the history of life, not only through the death of species but also through changes in ecosystem function and structure. Importantly, these events allow us the opportunity to study ecological dynamics under levels of environmental stress for which there are no recent analogues. Here, we examine the impact and selectivity of the Late Triassic mass extinction event on the functional diversity and functional composition of the global marine ecosystem, and test whether post-extinction communities in the Early Jurassic represent a regime shift away from pre-extinction communities in the Late Triassic. Our analyses show that, despite severe taxonomic losses, there is no unequivocal loss of global functional diversity associated with the extinction. Even though no functional groups were lost, the extinction event was, however, highly selective against some modes of life, in particular sessile suspension feeders. Although taxa with heavily calcified skeletons suffered higher extinction than other taxa, lightly calcified taxa also appear to have been selected against. The extinction appears to have invigorated the already ongoing faunal turnover associated with the Mesozoic Marine Revolution. The ecological effects of the Late Triassic mass extinction were preferentially felt in the tropical latitudes, especially amongst reefs, and it took until the Middle Jurassic for reef ecosystems to fully recover to pre-extinction levels.

Original languageEnglish
Pages (from-to)133-148
Number of pages16
JournalPalaeontology
Volume61
Issue number1
Early online date20 Oct 2017
DOIs
Publication statusPublished - 1 Jan 2018

Keywords

  • functional diversity
  • Jurassic
  • mass extinction
  • niche
  • regime shift
  • Triassic

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Palaeontology

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