Long term resilience decline in plant ecosystems across the Danian Dan-C2 hyperthermal event, Boltysh crater, Ukraine

D. W. Jolley, I Gilmour, M. Gilmour, D. B. Kemp, S. P. Kelley

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Abstract

Mass balance calculations indicate that a massive amount of 13C-depleted carbon was released into the early Danian atmosphere in volumes comparable with the younger Paleocene-Eocene thermal maximum (PETM). This Danian hyperthermal event (the Dan-C2) has been documented from the fill of the Boltysh meteorite crater, Ukraine. Palynofloras recovered from the Boltysh crater fill show a trend from mesic forest to savannah ecosystem dominance on a millennial scale across the hyperthermal inception with no abrupt compositional shift. This longer term trend is overprinted by moisture availability oscillations reflecting orbital forcing. Forcing is not directly tracked by the oscillations, which are composed of mesic forest and savannah palynofloras separated by rapid critical transitions. The absence of an ecological collapse at the Dan-C2 indicates that plant ecosystems experienced dominant forcing from orbital cyclicity, rather than a stochastic temperature rise.
Original languageEnglish
Pages (from-to)491-498
Number of pages8
JournalJournal of the Geological Society
Volume172
Issue number4
Early online date21 May 2015
DOIs
Publication statusPublished - Jun 2015

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