Late quaternary environmental change at Lake McKenzie, Southeast Queensland: evidence from microfossils, biomarkers and stable isotope analysis

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dc.contributor.authorAtahan, Pen_AU
dc.contributor.authorHeijnis, Hen_AU
dc.contributor.authorDodson, JRen_AU
dc.contributor.authorGrice, Ken_AU
dc.contributor.authorLe Métayer, Pen_AU
dc.contributor.authorTaffs, Ken_AU
dc.contributor.authorHembrow, SCen_AU
dc.contributor.authorWoltering, Men_AU
dc.contributor.authorZawadzki, Aen_AU
dc.date.accessioned2020-06-09T04:35:22Zen_AU
dc.date.available2020-06-09T04:35:22Zen_AU
dc.date.issued2013-07-10en_AU
dc.date.statistics2020-05-28en_AU
dc.description.abstractUnravelling 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 Authorsen_AU
dc.identifier.citationAtahan. 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, 10th-12th July 2013.en_AU
dc.identifier.conferenceenddate12 July 2013en_AU
dc.identifier.conferencename12th Australian Environmental Isotope Conferenceen_AU
dc.identifier.conferenceplacePerth, Australiaen_AU
dc.identifier.conferencestartdate10 July 2013en_AU
dc.identifier.govdoc9612en_AU
dc.identifier.urihttp://www.bukibuki.eu/aus-envisotope/AEIC2013_web_files/AEIC12abstracts_book2013.pdfen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9522en_AU
dc.language.isoenen_AU
dc.publisherUniversity of Western Australiaen_AU
dc.subjectQuaternary perioden_AU
dc.subjectEnvironmenten_AU
dc.subjectEcosystemsen_AU
dc.subjectLakesen_AU
dc.subjectQueenslanden_AU
dc.subjectAustraliaen_AU
dc.subjectFossilsen_AU
dc.subjectClimatic changeen_AU
dc.subjectPlantsen_AU
dc.titleLate quaternary environmental change at Lake McKenzie, Southeast Queensland: evidence from microfossils, biomarkers and stable isotope analysisen_AU
dc.typeConference Abstracten_AU
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