Now showing items 1-4 of 4

    • Estimating the normal background rate of species extinction. 

      De Vos, Jurriaan M; Joppa, Lucas N; Gittleman, John L; Stephens, Patrick R; Pimm, Stuart L (Conservation biology : the journal of the Society for Conservation Biology, 2015-04)
      A key measure of humanity's global impact is by how much it has increased species extinction rates. Familiar statements are that these are 100-1000 times pre-human or background extinction levels. Estimating recent rates ...
    • Global protected area impacts. 

      Joppa, Lucas N; Pfaff, Alexander (Proc Biol Sci, 2011-06-07)
      Protected areas (PAs) dominate conservation efforts. They will probably play a role in future climate policies too, as global payments may reward local reductions of loss of natural land cover. We estimate the impact of ...
    • High and far: biases in the location of protected areas. 

      Joppa, Lucas N; Pfaff, Alexander (PLoS One, 2009-12-14)
      BACKGROUND: About an eighth of the earth's land surface is in protected areas (hereafter "PAs"), most created during the 20(th) century. Natural landscapes are critical for species persistence and PAs can play a major role ...
    • How many species of flowering plants are there? 

      Joppa, Lucas N; Roberts, David L; Pimm, Stuart L (Proceedings. Biological sciences, 2011-02)
      We estimate the probable number of flowering plants. First, we apply a model that explicitly incorporates taxonomic effort over time to estimate the number of as-yet-unknown species. Second, we ask taxonomic experts their ...