Abstract
Patch size is known to affect biodiversity in fragmented landscapes, but is usually examined in systems where the surrounding matrix habitat is unfavourable. We examined beetle diversity in a floodplain ecosystem that is characterised by naturally occurring grassland patches within a dominant matrix of contrasting yet habitable forest. We asked whether differences in the beetle assemblage between grassland and forest vegetation depended on the area of the grassland patch, which is a function of its flooding frequency and duration: smaller grasslands tend to be higher on the floodplain and are flooded less often and for shorter periods than larger grasslands. We found a negative relationship between grassland area and beetle abundance and species richness, and a positive relationship between grassland area and compositional dissimilarity from the surrounding forest. As expected, we found an overall difference in composition between forest and grassland assemblages, with five beetle species more common in the grasslands. Our study indicates that floodplain grasslands not only support beetle assemblages that are distinct from the surrounding forest, but that assemblages from the larger grasslands are compositionally more distinct than those from smaller grasslands. A likely cause of this pattern is the reduced edge effects and greater environmental contrast between forest and large grasslands that may be exposed to greater variation in local climate. Ongoing changes to flood regimes and potential encroachment of forest plants may decrease grassland area in the future, which may reduce spatial heterogeneity in the insect community in this unique floodplain ecosystem.
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Acknowledgments
We are grateful to Raphael Didham and John Evans for providing thoughtful comments on an early version of the manuscript. We also thank Rolf Oberprieler, Adam Slipinski, Tom Weir and Hermes Escalona Garcia at the Australian National Insect Collection, CSIRO Ecosystem Sciences, for confirming the identity of some beetle species. We thank our research partners, Keith Ward and Neville Atkinson, Goulburn-Broken Catchment Management Authority; Paul O’Connor, Department of Sustainability and Environment; Lee Joachim, Yorta Yorta Nation Aboriginal Corporation; and Kane Weekes, Parks Victoria. Fieldwork was conducted under permit from Department of Sustainability and Environment and Parks Victoria. This research was funded by CSIRO Water for a Healthy Country National Research Flagship.
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Barton, P.S., Colloff, M.J., Pullen, K.R. et al. Grassland area determines beetle assemblage dissimilarity from surrounding floodplain forest. J Insect Conserv 17, 1209–1219 (2013). https://doi.org/10.1007/s10841-013-9602-8
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DOI: https://doi.org/10.1007/s10841-013-9602-8