More is less: net gain in species richness, but biotic homogenization over 140 years

Tora Finderup Nielsen, Kaj Sand-Jensen, Maria Dornelas, Hans Henrik Bruun

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38 Citations (Scopus)
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Abstract

While biodiversity loss continues globally, assessments of regional and local change over time have been equivocal. Here, we assess changes in plant species richness and beta diversity over 140 years at the level of regions within a country. Using 19th-century flora censuses for 14 Danish regions as a baseline, we overcome previous criticisms concerning short time series and neglect of completely altered habitats. We find that species composition has changed dramatically and directionally across all regions. Substantial species losses were more than offset by large gains, resulting in a net increase in species richness in all regions. The occupancy of initially widespread species increased, while initially rare species lost terrain. These changes were accompanied by strong biotic homogenization; i.e. regions are more similar now than they were 140 years ago. Species declining in Denmark were found to be in similar decline all over Northern Europe.
Original languageEnglish
Pages (from-to)1650-1657
JournalEcology Letters
Volume22
Issue number10
Early online date31 Jul 2019
DOIs
Publication statusPublished - 1 Oct 2019

Keywords

  • Baseline
  • Beta diversity
  • Biodiversity
  • Historical ecology
  • Homogenization
  • Landscape
  • Plants
  • Principal coordinates analyses
  • Species composition
  • Species richness

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