The Composition and Origin of the Avifauna

Evolution in Peripheral Isolated Populations: Carpodacus Finches on the California Islands

“…This seems to be a more realistic scenario than does a recent, trans-Gulf, over-water colonization of southern Baja California from the Mexican mainland (see Stager, 1960). This seems to be a more realistic scenario than does a recent, trans-Gulf, over-water colonization of southern Baja California from the Mexican mainland (see Stager, 1960).…”

EVOLUTION IN PERIPHERAL ISOLATED POPULATIONS:CARPODACUSFINCHES ON THE CALIFORNIA ISLANDS

“…In the meantime, the race C. m. frontalis, perhaps better adapted to drier conditions, moved into northern Baja California and northwestern Sonora. This seems to be a more realistic scenario than does a recent, trans-Gulf, over-water colonization of southern Baja California from the Mexican mainland (see Stager, 1960).…”

Speciation and Geographic Variation in Black-Tailed Gnatcatchers

“…Most early authors, assuming a geological permanence to the peninsula, accounted for present-day distributions and species relationships through invasions of Baja California by northern faunas coupled with the ecological effects of climatic changes (Grinnell 1928;Savage 1960;Stager 1960;Hubbard 1974). Most early authors, assuming a geological permanence to the peninsula, accounted for present-day distributions and species relationships through invasions of Baja California by northern faunas coupled with the ecological effects of climatic changes (Grinnell 1928;Savage 1960;Stager 1960;Hubbard 1974).…”