Late Glacial and Holocene Palaeoecology of the Lake St Clair Region

Event details

PhD Seminar

Date & time

Tuesday 13 March 2018


ANH Tearoom


Felicitas Hopf


Felicitas Hopf

Please note change of time from 12pm to 10.30am

High resolution analysis of the period of the Last Glacial Interglacial Transition (LGIT) is presented for a core from Lake St Clair, Tasmania located in the mid latitudes of the Southern Hemisphere. Deglaciation was complete and subalpine rainforest had replaced herbfields by c. 18.3 cal kyr BP in step with onset of Antarctic warming during the Last Termination. Phyllocladus aspleniifolius dominated rainforest and Eucalyptus had established at the site by 15 cal kyr BP followed in short by an increase in Poaceae between 15.2-13.8 cal kyr BP suggesting a return to cooler conditions slightly preceding the Antarctic Cold Reversal (ACR, 14.7-13.0 cal kyr BP). The abrupt decline in Phyllocladus aspleniifolius dominated rainforest and replacement with Nothofagus cunninghamii-Atherosperma moschatum rainforest at c. 12.4 cal kyr BP is suggested to indicate establishment of closed callidendrous rainforest as a result of improved soil feritility and an ameliorating climate. Coarser sediments deposited during The Early Holocene between c. 10.6 – 8.2 cal kyr BP are interpreted to represent increased precipitation and support the idea of a Southern Westerly Wind (SWW) dominated climate regime during this period as suggested at other Tasmanian sites. Increased fire activity and an increase in sclerophyllous vegetation after c. 5 cal kyr BP indicates a shift towards a climate more strongly influenced by El Nino Southern Oscillation (ENSO).

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