Genetics of Natural Populations. XXXVIII. Continuity and Change in Populations of Drosophila pseudoobscura in Western United States
Dobzhansky T, Anderson WW, Pavlovsky O. 1966. Genetics of Natural Populations. XXXVIII. Continuity and Change in Populations of Drosophila pseudoobscura in Western United States. Evolution. 20(3):418-427
Repeats gene frequencies for Santa Cruz Island Drosophila pseudoobscura Frolova, 1929 from Dobzhansky et al., 1964 (Diptera: Drosophilidae). See Anderson et al., 1975. Populations of Drosophila pseudoobscura were sampled during the summers of 1964 and 1965 in 17 localities in British Columbia, Washington, Oregon, Utah, Colorado, Arizona, New Mexico, and Texas. The variation in the gene arrangement in the third chromosomes was studied. The data so obtained are compared with those for California and Nevada populations sampled in 1963, and with older samples taken in 1957 and in 1940 or thereabouts. With few exceptions, the populations of the Pacific Coast states underwent similar changes between 1940 and 1963-1965, certain gene arrangements having grown more and others less frequent. No such systematic changes occurred in the populations living farther to the east. In some localities the genetic composition of the populations remained unchanged; in other localities considerable changes were observed, but these changes were different in kind in different populations. The causation of the genetic changes observed remains problematic.
- Type
- Journal Article
- Authors
- Dobzhansky, Theodosius; Anderson, Wyatt; Pavlovsky, Olga
- Units
- CHIS
- Keywords
- Animal Studies, Drosophila pseudoobscura (Diptera: Drosophilidae), Santa Cruz Island Channel Islands National Park CA