Little lasting impact of the paleocene-eocene thermal maximum on shallow marine molluscan faunas

Linda C Ivany, Carlie Pietsch, John C. Handley, Rowan Lockwood, Warren D. Allmon, Jocelyn A. Sessa

Research output: Contribution to journalArticle

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Abstract

Global warming, acidification, and oxygen stress at the Paleocene-Eocene Thermal Maximum (PETM) are associated with severe extinction in the deep sea and major biogeographic and ecologic changes in planktonic and terrestrial ecosystems, yet impacts on shallow marine macrofaunas are obscured by the incompleteness of shelf sections. We analyze mollusk assemblages bracketing (but not including) the PETM and find few notable lasting impacts on diversity, turnover, functional ecology, body size, or life history of important clades. Infaunal and chemosymbiotic taxa become more common, and body size and abundance drop in one clade, consistent with hypoxia-driven selection, but within-clade changes are not generalizable across taxa. While an unrecorded transient response is still possible, the long-term evolutionary impact is minimal. Adaptation to already-warm conditions and slow release of CO2 relative to the time scale of ocean mixing likely buffered the impact of PETM climate change on shelf faunas.

Original languageEnglish (US)
Article numbereaat5528
JournalScience advances
Volume4
Issue number9
DOIs
StatePublished - Sep 5 2018

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Hypsithermal
Paleocene
Eocene
body size
hypoxia
terrestrial ecosystem
acidification
deep sea
global warming
turnover
life history
extinction
fauna
ecology
timescale
oxygen
climate change
ocean
marine fauna

ASJC Scopus subject areas

  • General

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Little lasting impact of the paleocene-eocene thermal maximum on shallow marine molluscan faunas. / Ivany, Linda C; Pietsch, Carlie; Handley, John C.; Lockwood, Rowan; Allmon, Warren D.; Sessa, Jocelyn A.

In: Science advances, Vol. 4, No. 9, eaat5528, 05.09.2018.

Research output: Contribution to journalArticle

Ivany, Linda C ; Pietsch, Carlie ; Handley, John C. ; Lockwood, Rowan ; Allmon, Warren D. ; Sessa, Jocelyn A. / Little lasting impact of the paleocene-eocene thermal maximum on shallow marine molluscan faunas. In: Science advances. 2018 ; Vol. 4, No. 9.
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