Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/9522
Title: Late quaternary environmental change at Lake McKenzie, Southeast Queensland: evidence from microfossils, biomarkers and stable isotope analysis
Authors: Atahan, P
Heijnis, H
Dodson, JR
Grice, K
Le Métayer, P
Taffs, K
Hembrow, S
Woltering, M
Zawadski, A
Keywords: Quaternary period
Environment
Ecosystems
Lakes
Queensland
Australia
Fossils
Climatic change
Plants
Issue Date: 10-Jul-2013
Publisher: University of Western Australia
Citation: Atahan. P., Heijnis, H., Dodson, J., Grice, K., Le Métayer, P., Taffs, K., Hembrow, S., Woltering, M., & Zawadski, A. (2013). Late quaternary environmental change at Lake McKenzie, Southeast Queensland: evidence from microfossils, biomarkers and stable isotope analysis. Paper presented at the 12th Australian Environmental Isotope Conference, University of Western Australia, Perth, Australia.
Abstract: Unravelling links between climate change and vegetation response during the Quaternary is a research priority, and needed if the climate-environment interactions of modern systems are to be fully understood. Using a sediment core from Lake McKenzie, Fraser Island, we reconstruct changes in the lake ecosystem and surrounding vegetation over the last ca. 36.9 cal kyr BP. Evidence is drawn from multiple sources, including pollen, micro-charcoal, biomarker and stable isotope (C and N) analyses, and is used to improve understanding about the timing and spatial scale of past changes that have occurred locally and in the southeast Queensland region. The glacial period of the record, from ca. 36.9-18.3 cal kyr BP, is characterised by lower lake water levels and increased abundance of, or closer proximity to, plants of the aquatic and littoral zone. High abundance of biomarkers and microfossils of the colonial green alga Botryococcus occur at this time and include high variation in individual botryococcene 13C values. A distinct period of dry or ephemeral conditions at the site is detected during deglaciation, causing a hiatus in the sedimentary record covering the time period from ca. 18.3-14.0 cal kyr BP. The recommencement of sediment accumulation around 14.0 cal kyr BP occurs with evidence of lower fire activity in the area and reduced abundance of terrestrial herbs in the surrounding sclerophyll vegetation. The Lake McKenzie record conforms to existing records from Fraser Island by containing evidence for a mid-Holocene dry period, spanning the time period from ca. 6.1-2.5 cal kyr BP. © The Authors
Gov't Doc #: 9612
URI: http://www.bukibuki.eu/aus-envisotope/AEIC2013_web_files/AEIC12abstracts_book2013.pdf
http://apo.ansto.gov.au/dspace/handle/10238/9522
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