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atmospheric C0 Biodiversity BioScience 38 breeding British Columbia British Columbia Ministry California Native Plant Canada ceiba Chihuahua spruce chloroﬂuorocarbons climatic change colonization conifers Conservation biology CONSERVATION OF GENETIC conserve genetic conserve genetic diversity Critchfield destroy developing countries distribution of genetic diversity within species Dougl Douglas-fir E.O. Wilson earth’s ecologic endemic environmental change esthetic forest trees Forestry genes genetic diversity genetic loss genetic resources Gentry global warming Guadalupe Island habitat destruction Heterozygosity important increase isozyme variation Lectureship in Forest Leslie levels of C0 loss of populations M.E. Soulé Mexican Mexico Ministry of Forests mountains Native Plant Society Nuevo Leon ozone layer Picea chihuahuana pine Pinus range reduce reserves road scarcity and diversity Schaffer Lectureship science of scarcity seed banks Sierra Madre Occidental Sierra Madre Oriental Silvae Genetica Sinauer Associates southern Sunderland threat to genetic threats to diversity tree species Trinidad tropical forest U.S. Forest Service variation—like W.J. Libby