Using landscape history to predict biodiversity patterns in fragmented landscapes

Robert M. Ewers, Raphael K. Didham, William D. Pearse, Veronique Lefebvre, Isabel M.D. Rosa, João M.B. Carreiras, Richard M. Lucas, Daniel C. Reuman

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)
136 Downloads (Pure)

Abstract

Landscape ecology plays a vital role in understanding the impacts of land-use change on biodiversity, but it is not a predictive discipline, lacking theoretical models that quantitatively predict biodiversity patterns from first principles. Here, we draw heavily on ideas from phylogenetics to fill this gap, basing our approach on the insight that habitat fragments have a shared history. We develop a landscape ‘terrageny’, which represents the historical spatial separation of habitat fragments in the same way that a phylogeny represents evolutionary divergence among species. Combining a random sampling model with a terrageny generates numerical predictions about the expected proportion of species shared between any two fragments, the locations of locally endemic species, and the number of species that have been driven locally extinct. The model predicts that community similarity declines with terragenetic distance, and that local endemics are more likely to be found in terragenetically distinctive fragments than in large fragments. We derive equations to quantify the variance around predictions, and show that ignoring the spatial structure of fragmented landscapes leads to over-estimates of local extinction rates at the landscape scale. We argue that ignoring the shared history of habitat fragments limits our ability to understand biodiversity changes in human-modified landscapes.
Original languageEnglish
Pages (from-to)1221-1233
Number of pages13
JournalEcology Letters
Volume16
Issue number10
Early online date11 Aug 2013
DOIs
Publication statusPublished - 12 Sept 2013

Keywords

  • distance-dissimilarity curve
  • habitat grafmentation
  • habitat loss
  • landscape divergence hypothesis
  • nested communites
  • neutral model
  • random sampling
  • spatial autocorrelation
  • spatial insurance
  • vicariance model

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