No place to retreat; heavy extinction and delayed recovery on a Pacific guyot during the Paleocene-Eocene Thermal Maximum

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doi: 10.1130/G36379.1
Author(s): Yamaguchi, Tatsuhiko; Norris, Richard D.
Author Affiliation(s): Primary:
Kochi University, Center for Advanced Research for Marine Core, Kochi, Japan
Other:
Scripps Institution of Oceanography, United States
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 43(5), p.443-446. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. GSA Data Repository item 2015153. 34 refs.; illus.
Summary: Modern global change threatens alpine ecosystems by forcing species to migrate to higher elevations and potentially eliminating alpine habitat altogether. Here we show that an analogous restriction of suitable habitat operates on submarine mountains. During the Paleocene-Eocene Thermal Maximum (PETM, ca. 55.96 Ma), ostracodes underwent local extinction on the crest of Allison Guyot in the central Pacific Ocean, which lost 64% of its ostracode species richness (14 species reduced to three species) and as much as 94% of ostracode abundance for ∼1.1 m.y., before recolonization rebuilt biodiversity and abundance over the next 200 k.y. Biotic changes may reflect an increase in current speeds, acidification, and a decrease in food supply owing to a temperature-driven increase in metabolic rates. Notably, continental margin ostracodes also underwent extinction during the PETM (25%-38% loss) but, unlike Allison Guyot faunas, could quickly repopulate the continental slope. The absence of refugia for isolated seamounts prolonged the reduction in biodiversity initiated by the PETM, a pattern that may be expected for modern seamount faunas in an era of future global change.
Year of Publication: 2015
Research Program: ODP Ocean Drilling Program
Key Words: 10 Paleontology, Invertebrate; Allison Guyot; Arthropoda; Biostratigraphy; Cenozoic; Climate change; Climate effects; Cores; Crustacea; East Pacific; Extinction; Invertebrata; Leg 143; Mandibulata; Marine sediments; Microfossils; Mid-Pacific Mountains; North Pacific; Northeast Pacific; ODP Site 865; Ocean Drilling Program; Ostracoda; Pacific Ocean; Paleocene-Eocene Thermal Maximum; Paleoclimatology; Paleoecology; Paleogene; Paleotemperature; Sediments; Species diversity; Tertiary
Coordinates: N182624 N182626 W1793320 W1793321
Record ID: 2015039975
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