@misc{indiciae22a2adba1639,
  title = {Ecology and the ratchet of events: Climate variability, niche dimensions, and species distributions},
  author = {S.T. Jackson and J.L. Betancourt and R.K. Booth and S.T. Gray},
  year = {2009},
  doi = {10.1073/pnas.0901644106},
  url = {https://pubs.usgs.gov/publication/70034289},
  note = {Source identifier: 70034289}
}