PHYLOGENETIC AND BIOGEOGRAPHIC RELATIONSHIPS IN THE NEOTROPICAL GENUSGYMNOPITHYS (FORMICARIIDAE)

Authors
Citation
Sj. Hackett, PHYLOGENETIC AND BIOGEOGRAPHIC RELATIONSHIPS IN THE NEOTROPICAL GENUSGYMNOPITHYS (FORMICARIIDAE), The Wilson bulletin, 105(2), 1993, pp. 301-315
Citations number
51
Categorie Soggetti
Ornithology
Journal title
ISSN journal
00435643
Volume
105
Issue
2
Year of publication
1993
Pages
301 - 315
Database
ISI
SICI code
0043-5643(1993)105:2<301:PABRIT>2.0.ZU;2-6
Abstract
Evolutionary relationships among obligate ant-following birds in the g enus Gymnopithys were addressed using phenetic and phylogenetic analys es of allozyme characters. Genetic variation at 37 gene loci was analy zed across all four species in the genus and within two species (Bicol ored Antbird [G. leucaspis], and White-throated Antbird [G. salvini]). Interspecific genetic distances were high, and comparable to other st udies of Neotropical birds, which exceed those in many temperate zone species. Within the genus, Lunulated Antbird (G. lunulata) and G. salv ini were sister taxa. There was only weak support for a sister-taxon r elationship between G. leucaspis and the Rufous-throated Antbird (G. r ufigula). Within G. leucaspis and G. salvini, high F(st) indicated sub stantial genetic subdivision, again comparable to other Neotropical bi rds and much greater than temperate zone birds. Increased age of popul ation isolation is proposed to account for the high genetic divergence in Neotropical birds.