Journal Article

Biodiversity change in heathland and its relationships with shifting local fire regimes and native species expansion

Nancy Shackelford, Michael Renton, Michael P. Perring, Kristine Brooks and Richard J. Hobbs

in Journal of Plant Ecology

Volume 8, issue 1, pages 17-29
Published in print February 2015 | ISSN: 1752-9921
Published online June 2014 | e-ISSN: 1752-993X | DOI: https://dx.doi.org/10.1093/jpe/rtu005
Biodiversity change in heathland and its relationships with shifting local fire regimes and native species expansion

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Aims

Understanding the relationships among disturbance, invasion and species change is essential for effective management of many systems. We investigated relationships among fire history, invasion by a native tree species, Allocasuarina huegeliana, and diversity change to understand the potential drivers of plant community alteration in a complex and biodiverse system.

Methods

We used plant species surveys from 1983 and 2011 to quantify species loss/gain and thence compositional changes. Additionally, we surveyed population densities of the invasive species and collated long-term fire history data for each site. General linear models and non-parametric models were used to assess the strength of relationships between the three variables of interest.

Important Findings

Within the last 30 years, ~11% of the plant species richness was lost from the reserve. At an individual site level, we found only a 4% average decrease in overall plant species richness, but large species losses and gains that imply considerable compositional shifts. Though such shifts might be expected over 30 years, many of the gained species were common, potentially opportunistic species, while those lost were often locally rare woody perennials. In addition, gained species tended to be expanding their recorded range westward suggesting that they may be responding to the regional drying climate. The relationship between invasion density and species loss was strong over all spatial scales. We identified a potential state change to dominance by the native invasive particularly as high densities prevented species gain at the site scale. In these extreme cases of high invasive density and high biodiversity loss, we argue that there may be a need to directly address the expanding native population.

Keywords: kwongan; sandplain heath; Allocasuarina huegeliana; native invasion; woody encroachment

Journal Article.  8451 words.  Illustrated.

Subjects: Ecology and Conservation ; Plant Sciences and Forestry

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