| Title | Last global extinction in the deep sea during the mid-Pleistocene climate transition |
| Author | Hayward, B.W.; Kawagata, S.; Grenfell, H.R.; Sabaa, A.T.; O'Neill, T. |
| Author Affil | Hayward, B.W., Geomarine Research, Auckland, New Zealand. Other: Massey University, New Zealand |
| Source | Paleoceanography, 22(3), PA3103. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0883- 8305 |
| Publication Date | Sept. 2007 |
| Notes | In English. 75 refs. GeoRef Acc. No: 288409. CRREL Acc. No: 63000873 |
| Index Terms | climatic change; glacial deposits; ice; ocean environments; marine deposits; ocean currents; paleoclimatology; paleoecology; Pleistocene; Quaternary deposits; sediments; Caribbean Sea; Indian Ocean; Ocean Drilling Program--ODP Site 1000; Ocean Drilling Program--ODP Site 722; Ocean Drilling Program--ODP Site 980; Antarctic Bottom Water; Antarctic Intermediate Water; Atlantic Ocean; biodiversity; Cenozoic; Circumpolar Deep Water; climate change; cores; currents; deep-sea environment; extinction; Foraminifera; glacial environment; glaciomarine environment; global; interglacial environment; Invertebrata; Leg 117; Leg 162; Leg 165; marine environment; marine sediments; microfossils; middle Pleistocene; North Atlantic; North Atlantic Deep Water; Ocean Drilling Program; ODP Site 1000; ODP Site 722; ODP Site 980; paleo-oceanography; paleocirculation; paleocurrents; Protista; Quaternary; sea ice; trophic analysis; world ocean |
| Abstract | Twenty percent (19 genera, 95 species) of cosmopolitan, deep-sea (500-4000 m), benthic foraminiferal species became extinct during the late Pliocene-middle Pleistocene (3-0.12 Ma), with the peak of extinctions (76 species) occurring during the mid-Pleistocene Climate Transition (MPT, 1.2-0.55 Ma). One whole family (Stilostomellidae, 30 species) was wiped out, and a second (Pleurostomellidae, 29 species) was decimated with just one species possibly surviving through to the present. Our studies at 21 deep-sea core sites show widespread pulsed declines in abundance and diversity of the extinction group species during more extreme glacials, with partial interglacial recoveries. These declines started in the late Pliocene in southern sourced deep water masses (Antarctic Bottom Water, Circumpolar Deep Water) and extending into intermediate waters (Antarctic Intermediate Water, North Atlantic Deep Water) in the MPT, with the youngest declines in sites farthest downstream from high-latitude source areas for intermediate waters. (modif. j. abst.) |
| URL | http://hdl.handle.net/10.1029/2007PA001424 |
| Publication Type | journal article |
| Record ID | 85095 |