Holocene Environmental Change in Tasmanian Ecosystems

The Holocene epoch in Tasmania has been characterised by a complex interplay of climatic shifts, fire regimes and biotic responses that have shaped the island’s unique mosaic of rainforests, sclerophyll forests, buttongrass moorlands and freshwater systems. Early Holocene warming and increased precipitation facilitated the expansion of cool-temperate rainforest taxa such as Nothofagus and Phyllocladus, while fire activity remained relatively low. Mid-Holocene stability saw rainforest reaches its maximum extent, accompanied by reduced flammability and clearer lakes. From the late Holocene onwards, increasing variability in rainfall, intensification of Aboriginal cultural burning and episodic droughts drove a decline in rainforest elements, the spread of fire-adapted Eucalyptus woodlands and the persistence of buttongrass moorlands under frequent low-intensity fire. Palaeoecological records also reveal that aquatic ecosystems responded sensitively to terrestrial changes: shifts in diatom communities, nutrient cycling and water clarity track fluctuations in catchment vegetation and erosion driven by fire and climatic oscillations. These findings underscore the global significance of Tasmania as a model for understanding Holocene ecological resilience, the role of humans in moderating fire regimes and the vulnerability of island ecosystems to ongoing climate change.

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Holocene Environmental Change in Tasmanian Ecosystems publication trend

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Technical terms

Holocene: the geological epoch from ~11,700 years ago to present, marked by postglacial warming and ecosystem development.

Palaeoecology: reconstruction of past environments and ecosystems using geological and biological proxies from sediments.

Palynology: analysis of pollen and spores preserved in sediment cores to infer historical vegetation patterns.

Diatom assemblage: the composition of silica-walled microalgae in sediments, used as indicators of past aquatic conditions.

Charcoal influx: measurement of charcoal particle concentration in sediment, serving as a proxy for past fire frequency and intensity.

Buttongrass moorland: open, fire-maintained wet heathland dominated by Gymnoschoenus sphaerocephalus, characteristic of western Tasmanian uplands.

References

1. Aquatic ecosystem response to climate, fire, and the demise of montane rainforest, Tasmania, Australia. Global and Planetary Change (2023).
2. Vegetation, fire and climate history in central-western Tasmania (41°S), Australia, over the last ∼21,000 years. Quaternary Science Reviews (2023).
3. Indigenous Fire-Managed Landscapes in Southeast Australia during the Holocene—New Insights from the Furneaux Group Islands, Bass Strait. Fire (2021).