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SUMMARY:Productivity and dissolved oxygen controls on the Southern Ocean d
 eep-sea benthos during the Antarctic Cold Reversal - Joseph Stewart\, Univ
 ersity of Bristol
DTSTART:20211104T150000Z
DTEND:20211104T160000Z
UID:TALK164335@talks.cam.ac.uk
CONTACT:Oscar Branson
DESCRIPTION:The Antarctic Cold Reversal (ACR\; 14.7 to 13 thousand years a
 go\; ka) phase of the last deglaciation saw a pause in the rise of atmosph
 eric CO2 and Antarctic temperature\, that contrasted with warming in the N
 orth. A re-expansion of sea ice and a northward shift in the position of t
 he westerly winds in the Southern Ocean are well-documented\, but the resp
 onse of deep-sea biota and the primary drivers of habitat viability remain
  unclear. Here we present a new perspective on ecological changes in the d
 eglacial Southern Ocean\, including multi-faunal benthic assemblage (foram
 inifera and cold-water corals) and coral geochemical data (Ba/Ca and δ11B
 ) from the Drake Passage. Our records show that\, during the ACR\, peak ab
 undances of thick-walled benthic foraminifera Uvigerina bifurcata and cora
 ls are observed at shallow depths in the sub-Antarctic (~300 m)\, while co
 ral populations at greater depths and further south diminished. Our ecolog
 ical and geochemical data indicate that habitat shifts were dictated by (i
 ) a northward migration of food supply (primary production) into the Suban
 tarctic Zone and (ii) poorly oxygenated seawater at depth during this Anta
 rctic cooling interval. 
LOCATION:Department of Earth Sciences\, Tilley Lecture Theatre
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