COMPARATIVE PHYLOGEOGRAPHY OF SOME ARIDLAND BIRD SPECIES

摘要: Abstract We compared mitochondrial DNA sequences for six species distributed across the aridlands of North America to document phylogeographic patterns and assess levels congruence. The Curve-billed Thrasher (Toxostoma curvirostre) Canyon Towhee (Pipilo fuscus) show genetic divisions between Sonoran Chihuahuan Deserts, whereas Cactus Wren (Campylorhynchus brunneicapillus), Black-tailed Gnatcatcher (Polioptila melanura), Verdin (Auriparus flaviceps) do not. Most likely, without structure only recently colonized their entire current range. Therefore, although these are today part a widespread avifauna, species' distributions were historically different from today. In Baja California, breaks at 28°–30°N, consistent with division previously described in LeConte's lecontei) some members herpetofauna. These likely caused by isolation resulti...