2008/02/01 by Jeffrey M. DaCosta, JEFFREY M. DACOSTA, Walter Wehtje +3 · 1 voice · 15 citations
Biochemistry, Genetics and Molecular Biology · Environmental Science · #Allopatric speciation #Biology #Clade #Demography #Genetic diversity and population structure #Geography #Monophyly #Paraphyly #Phylogenetic tree #Population #Range (aeronautics) #Species Distribution and Climate Change #Subspecies #Wildlife Ecology and Conservation #Zoology
paper · pdf · doi:10.1525/cond.2008.110.1.170
published in Ornithological Applications 110(1), 170-177 (Oxford University Press)
openalex publication_date 2008/02/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
The Great-tailed Grackle (Quiscalus mexicanus) and Boat-tailed Grackle (Q. major) are sister species that have expanded their ranges during historical times. This expansion has created an area of sympatry between these species in Texas and Louisiana, and between distinctive Great-tailed Grackle subspecies in the southwestern United States and northern Mexico. We investigated the evolutionary histories of both species using mitochondrial DNA sequence data and modern phylogenetic methods. Our results reveal genetic structure within Great-tailed, but not Boat-tailed Grackles. Great-tailed Grackles are separated into two clades, but range expansion in the north has led to secondary contact between them. Boat-tailed Grackles are monophyletic and are embedded within the Great-tailed Grackle assemblage, rendering the latter paraphyletic. These results reveal a complex phylogeographic pattern caused by recent range expansion and secondary contact of once allopatric units.