An Early Holocene Palaeoenvironmental Record from Two Mile Lake, South‐Western Australia

Itzstein-Davey, Freea

doi:10.1080/0004918042000311340

Cited by 10 publications

(12 citation statements)

References 17 publications

(33 reference statements)

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“…This example illustrates the difficulty of identifying unknown Myrtaceae types at species level, even for times in the geologically very recent past when environments were similar to today, and even where the modern Myrtaceae flora includes only a few dozen species within a handful of related genera. Identification of unknown Proteaceae pollen to genus or species level presents similar problems [ 53 , 55 , 56 ].…”

Section: Resultsmentioning

confidence: 99%

Pollen analysis of Australian honey

et al. 2018

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Pollen analysis is widely used to verify the geographic origin of honeys, but has never been employed in Australia. In this study, we analysed the pollen content of 173 unblended honey samples sourced from most of the commercial honey producing regions in southern Australia. Southern Australian vegetation is dominated by Eucalyptus (Myrtaceae) forests and, as expected, most Australian honeys are palynologically dominated by Eucalyptus, while other important components include Myrtaceae taxa such as Corymbia/Angophora and the tribe Leptospermeae; plus Brassicaceae, Echium, Macadamia, and Acacia. An important feature of the honeys is the number of Myrtaceae pollen morphotypes per sample, which is generally high (mean = 4.6) compared to honeys produced outside of Australia, including Eucalyptus honeys produced in the Mediterranean region, and honeys produced in South America, which has its own rich indigenous Myrtaceae flora. In the latter regions, the number of Myrtaceae morphotypes is apparently generally ≤2. A high number of Myrtaceae morphotypes may be a feasible criterion for authenticating the origin of Australian honeys, since most Australian honey is produced by honey bees mainly working indigenous floral resources. Myrtaceae morphotype diversity is a convenient melissopalynological measure that could be applied even where detailed knowledge of the pollen morphology of the many component genera and species is absent. Palynological criteria developed in Europe for authenticating Eucalyptus honeys should not be relied upon for Australian honeys, since those criteria are not based on samples of Australian honey.

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Section: Resultsmentioning

confidence: 99%

Pollen analysis of Australian honey

et al. 2018

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“…The Late Pleistocene environmental and climate history of southwestern Western Australia is little known. Aspects of the vegetation and climate history of the southwest have been documented through Holocene lacustrine pollen records (e.g., Dodson & Lu, 2000;Gouramanis et al, 2012;Itzstein-Davey, 2004), but none of these records have extended into the Pleistocene. Aspects of the vegetation and climate history of the southwest have been documented through Holocene lacustrine pollen records (e.g., Dodson & Lu, 2000;Gouramanis et al, 2012;Itzstein-Davey, 2004), but none of these records have extended into the Pleistocene.…”

Section: Introductionmentioning

confidence: 99%

“…Previously published evidence of its biota and climate are confined to relatively coarsely dated fossil wood (Burke, 2004;Dortch, 2004) and vertebrate assemblages (Faith et al, 2017) recovered during archeological cave excavations, and a marine sediment pollen record offshore of the south coast of Western Australia (van der Kaars et al, 2017), which provides a spatially generalized picture of vegetation change throughout the last glacial cycle but includes no samples within the 30-to 20-ka window. Aspects of the vegetation and climate history of the southwest have been documented through Holocene lacustrine pollen records (e.g., Dodson & Lu, 2000;Gouramanis et al, 2012;Itzstein-Davey, 2004), but none of these records have extended into the Pleistocene. For this reason, we turn to speleothem palynology (McGarry & Caseldine, 2004;Sniderman et al, 2016), the recovery of fossil pollen from radiometrically dated speleothems (secondary cave carbonates including stalagmites and flowstones).…”

Section: Introductionmentioning

confidence: 99%

Vegetation and Climate Change in Southwestern Australia During the Last Glacial Maximum

Sniderman

Hellström

Woodhead

et al. 2019

Geophysical Research Letters

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The nature and duration of the Last Glacial Maximum (LGM) in Australia are poorly understood, with little regional agreement on the timing and direction of LGM climate changes. One reason for this is that Australian Late Pleistocene terrestrial sediments typically are both sparse and inorganic, inhibiting the development of detailed radiocarbon chronologies. To address this problem, we extracted fossil pollen from radiometrically dated stalagmites collected in southwest Western Australia. Our pollen record, supported by 30 U‐Th dates, reveals the vegetation response to Late Pleistocene climates between ~34 and 14 ka, through the body of the LGM. Before ~28 ka, sclerophyll forests were more open than today, but at ~28 ka forest cover was essentially eliminated, and treeless conditions were maintained until progressive reforestation at ~17.5 ka. This ~10‐ka‐long full glacial episode correlates with other mid‐high latitude Southern Hemisphere records, suggesting that LGM environmental changes were closely coordinated across the hemisphere.

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“…This paper is the fifth in a series. It reviews previous findings (Itzstein‐Davey, 2003; 2004a, b; Atahan et al , 2004) and discusses changes in the abundance and diversity of the Proteaceae over the Cenozoic, examining key periods of change including the Eocene, Pliocene and Holocene, and comparing them with extant communities in south‐western Australia.…”

Section: Introductionmentioning

confidence: 99%

“…Despite the importance of the Proteaceae family in south‐western Australia, no palynological series of sequences throughout the Cenozoic focusing on the dynamics and evolution of one plant family has previously been attempted. This prompted an integrated study investigating the development of the Proteaceae over the Cenozoic from fossil pollen studies conducted concurrently on Eocene, Pliocene and Quaternary sediments and a modern pollen rain study (Itzstein‐Davey, 2003; 2004a, b; Atahan et al , 2004). The aim of the study was to determine changes in the abundance and diversity of Proteaceae in south‐western Australia in the context of a vegetation history framework, using palynology as the primary method.…”

Section: Introductionmentioning

confidence: 99%

Changes in the Abundance and Diversity of Proteaceae in South‐western Australia: a Review of an Integrated Palaeoenvironmental Study

Itzstein-Davey

2007

Geographical Research

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South-western Australia is a globally significant hotspot of Proteaceae diversity. This review reports on changes in the abundance and diversity of Proteaceae in south-western Australia. Using palynology, the data were obtained from three sediment sequences from the Eocene, Pliocene and Holocene, as well as a modern pollen rain study, in the context of a vegetation history framework. The total percentages of Proteaceae pollen in pollen counts indicate that the number of Proteaceae in the vegetation are highest at present, slightly lower, yet still high in the Eocene, reduced by the Pliocene and lowest in the Holocene. It was found that Proteaceous genera can contribute up to 50% of the total modern pollen rain. Sediment from Lake Lefroy showed Nothofagus-dominated rainforest occurred in the Middle to Late Eocene. Proteaceae species were at least as diverse as today, contributing up to a maximum of 42% of the total pollen rain, and varying across small lateral distances. A laminated Pliocene age sequence from Yallalie confirmed other studies that south-western Australia was covered by a rich vegetation mosaic consisting of heath and wet rainforest elements. Proteaceae species were a consistent component of the counts, although diversity and abundance (maximum 5%) were low. A Holocene record from Two Mile Lake, near the Stirling Range, recorded little environmental change. Proteaceae species were noted in low abundance, at a maximum of 3.5% of the total pollen count. It is likely that both changing pollination mechanisms and changes in associated vegetation are important in determining the dispersal of Proteaceous pollen.

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An Early Holocene Palaeoenvironmental Record from Two Mile Lake, South‐Western Australia

Cited by 10 publications

References 17 publications

Pollen analysis of Australian honey

Pollen analysis of Australian honey

Vegetation and Climate Change in Southwestern Australia During the Last Glacial Maximum

Changes in the Abundance and Diversity of Proteaceae in South‐western Australia: a Review of an Integrated Palaeoenvironmental Study

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