Late quaternary environmental change at Lake McKenzie, in subtropical eastern Australia: evidence from sedimentary carbon, nitrogen and biomarkers

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dc.contributor.authorAtahan, Pen_AU
dc.contributor.authorHeijnis, Hen_AU
dc.contributor.authorLe Métayer, Pen_AU
dc.contributor.authorGrice, Ken_AU
dc.contributor.authorTaffs, Ken_AU
dc.contributor.authorHembrow, SCen_AU
dc.contributor.authorDodson, JRen_AU
dc.date.accessioned2020-06-10T06:30:32Zen_AU
dc.date.available2020-06-10T06:30:32Zen_AU
dc.date.issued2013-02-13en_AU
dc.date.statistics2013-06-01en_AU
dc.description.abstractFraser Island is part of a large sand mass that extends along the subtropical coastline of south-eastern Queensland. The island is a World Heritage site, listed for its unique natural environment that includes numerous perched oligotrophic dune lakes and a diverse suite of coastal and subtropical vegetation communities. Here we present geochemical and microfossil information for a sediment core collected from Lake McKenzie, in the island’s centre. AMS 14C and 210Pb dating has been conducted and indicates a basal age of ca. 37,000 cal. BP. A hiatus in the sedimentary record is apparent at around 25 cm depth and spans the time period from ca. 18,280 to 13,990 cal yr BP. Elemental and stable isotope measurements of carbon and nitrogen in bulk organic matter, along with biomarker and compound specific carbon isotope analyses, show a clear shift in lake conditions appearing with the re-commencement of sediment accumulation following this hiatus. A marked decline in the abundance of microfossils of the green colonial algae Botryococcus, coincides with a distinct change in composition of Botryococcus derived lipids and a shift to more negative δ13C values of long chain odd n-alkane compounds. An increase in lake size around 13,990 cal yr BP is suggested by the recommencement of sediment accumulation at the site, and is presumably in response to increased effective precipitation. The lake McKenzie record provides a long-term perspective on changing environmental conditions in central Fraser Island.en_AU
dc.identifier.citationAtahan, P., Heijnis, H., Le Métayer, P., Grice, K., Taffs, K., Hembrow S., & Dodson, J. (2013). Late quaternary environmental change at Lake McKenzie, in subtropical eastern Australia: evidence from sedimentary carbon, nitrogen and biomarkers. Paper presented the Past Global Changes 4th Open Science Meeting, Goa, India 13-16 February 2013, (pp. 194).en_AU
dc.identifier.conferenceenddate16 February 2013en_AU
dc.identifier.conferenceplacePast Global Changes 4th Open Science Meetingen_AU
dc.identifier.conferenceplaceGoa, Indiaen_AU
dc.identifier.conferencestartdate13 February 2013en_AU
dc.identifier.govdoc9674en_AU
dc.identifier.pagination194en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9537en_AU
dc.language.isoenen_AU
dc.publisherPast Global Changesen_AU
dc.subjectQueenslanden_AU
dc.subjectLakesen_AU
dc.subjectAustraliaen_AU
dc.subjectCarbonen_AU
dc.subjectNitrogenen_AU
dc.subjectSedimentationen_AU
dc.subjectSanden_AU
dc.subjectCoastal watersen_AU
dc.subjectClimatesen_AU
dc.subjectEnvironmenten_AU
dc.subjectFossilsen_AU
dc.subjectCarbon 14en_AU
dc.subjectLipidsen_AU
dc.subjectAlgaeen_AU
dc.titleLate quaternary environmental change at Lake McKenzie, in subtropical eastern Australia: evidence from sedimentary carbon, nitrogen and biomarkersen_AU
dc.typeConference Posteren_AU
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