Jump A (2009) A finer focus on glacial refugia in the Mediterranean region. Frontiers of Biogeography, 1 (1), p. 5. http://www.azoresbioportal.angra.uac.pt/files/noticias_Frontiers%20of%20Biogeography%201_September2009.pdf#page=7
First paragraph: The importance of glacial refugia in structuring biodiversity has long been recognised. By allowing local persistence during past glacial periods, these areas were instrumental in retaining diversity at global to local scales, from the genetic variation within species to the diversity of species themselves.
Frontiers of Biogeography: Volume 1, Issue 1