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Environmental heterogeneity promotes floristic turnover in temperate forests of south-eastern Australia more than dispersal limitation and disturbance

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Abstract

Context

Australia’s temperate forest landscapes encompass broad topographic and edaphic ranges, and are regularly disturbed by fire. Nonetheless, relative contributions of environmental heterogeneity, disturbance regimes, and dispersal limitations to plant species turnover remain poorly understood.

Objectives

To evaluate the relative influences of deterministic (environmental, disturbance), and stochastic (spatial) processes on plant species turnover [beta-diversity (β diversity)] in natural forest landscapes, and how such influences vary among plant functional types and vegetation strata.

Methods

We assessed the environment and species composition of 81 forest stands, representing a range of structures and fire histories across contiguous landscapes in south-eastern Australia, and examined the potential to explain β diversity using variance partitioning and distance-decay analyses.

Results

Explanatory variables accounted for 34–55% of β diversity of multiple plant functional types, with environmental heterogeneity explaining the greatest proportion (10–25%). Stand structural variables (e.g., leaf area index, height coefficient of variation) accounted for 8–14% of β diversity in understorey life forms and 5% in canopy species, far greater than a single direct descriptor of disturbance history such as time-since-fire which explained just 2% of tree and shrub β diversity. β Diversity increased with increasing geographic distance for all functional types. Dispersal limitation accounted for 5–11% of β diversity, and distance-decay rates varied among plant functional types.

Conclusions

Landscape-scale conservation of forest biodiversity will require representation of a broad environmental range as well as metrics that fully capture site disturbance histories, including stand structural complexity as a potential proxy for fire regimes.

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Acknowledgements

This research was undertaken with Approval by the Victorian Department of Environment, Land, Water and Planning (DELWP) under Research Permit Numbers 10006440, 10006691 and 10007105. The work was funded by the Victorian DELWP iFER (Integrated Forest Ecosystem Research) program as well as the CSIRO Sustainable Agriculture Flagship Program. We would like to thank those who contributed to data collection and processing, including B. Smith, J. Najera, D. Lockwood and L. Parker. We thank two anonymous reviewers for comments that improved the manuscript.

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  1. School of Ecosystem and Forest Sciences, The University of Melbourne, 500 Yarra Boulevard, Richmond, VIC, 3121, Australia

    Sabine Kasel, Cristina Aponte, Melissa Fedrigo & Craig R. Nitschke

  2. School of Ecosystem and Forest Sciences, The University of Melbourne, 4 Water Street, Creswick, VIC, 3353, Australia

    Lauren T. Bennett

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  1. Sabine Kasel
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  2. Lauren T. Bennett
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  3. Cristina Aponte
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Correspondence to Sabine Kasel.

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Kasel, S., Bennett, L.T., Aponte, C. et al. Environmental heterogeneity promotes floristic turnover in temperate forests of south-eastern Australia more than dispersal limitation and disturbance. Landscape Ecol 32, 1613–1629 (2017). https://doi.org/10.1007/s10980-017-0526-7

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