Researchers have also observed selection-driven physical and genetic changes in populations of the Alpine chipmunk (Tamias alpinus), which was affected by contraction of its elevational range. While most parts of the chipmunk genome had not changed, there were shifts in variants of a gene related to regulation of the animals’ ability to survive in low-oxygen environments (ALOX15). In the Yosemite transect, no significant change in avian species abundance was found. Grinnell documented 133 species and the resurvey team reported 140 bird species. The report's section on amphibians and reptiles noted healthy populations of mountain yellow-legged frog (Rana muscosa) at Yosemite's Dorothy Lake and breeding populations near Evelyn Lake. This species (or Distinct population segment) is listed as endangered by the US Fish and Wildlife Service. In 2013 a team of researchers from the San Diego Natural History Museum completed a five-year survey of the Grinnell Transect, Grinnell's 1908 study of the flora and fauna of Mount San Jacinto. In 60 surveys across 20 sites, they found the forest to be much denser than in Grinnell's time, with the loss of three species including a flying squirrel, and an increase in birds that like thick brush, such as the hermit thrush, the brown creeper and the Townsend's solitaire. The relative lack of leaf litter and decayed ground cover in Grinnell's time was considered to make the occurrence of hot and lasting fires in the forest impossible. With a much thicker understory in 2013, the team of researchers were forced by the Mountain Fire to evacuate their camp. Conservation Grinnell worked on conservation issues in the latter part of his life. He wrote several articles: "Bird Life as a Community Asset" (1914), A Conservationist's Creed as to Wild-Life Administration" (1925), "Animal Life as an Asset of National Parks" (1916), and " Bats As Disirable Citizens" (1916). He tried to change National Park Service policies on predator control and on forest management. Additionally, he promoted the idea of a trained biologist or naturalist in national parks to conduct public education programs for visitors. He studied and published on the Point Lobos area on the California coast, and during the last two years of his life, studied animal life at Hastings Reserve in Santa Lucia Mountains of Carmel Valley, California. National parks The Museum of Vertebrate Zoology's Yosemite survey of 1914–1924 documented the area's wildlife. A second goal of the survey was education of