Abstract
One of the best examples of differentiation and hybridization among South American passerine birds is exhibited by Icterus cayanensis (Epaulet Oriole) and Icterus chrysocephalus (Moriche Oriole). Icterus chrysocephalus is a monotypic species restricted to northern South America. Icterus cayanensis is a polytypc species that ranges from Suriname and French Guyana to northern Argentina. Five subspecies are recognized to I. cayanensis. Hybrid zones are known between I. cayanensis and I. chrysocephalus as well as between subspecies of I. cayanenis, even though character variation has never been adequately assessed and mapped. Although molecular data support the hypothesis that I. cayanensis and I. chrysocephalus form a monophyletic group, they do not support the species limits currently recognized within this group. We analysed the geographic variation of plumage characters along the range of this group to map the geographic variation of individual plumage characters and identify the populations that have uniform phenotypic character expression and therefore represent genuine phylogenetic species. We also used molecular data to investigate the phylogenetic relationships among these species. Geographic variation of plumage characters, habitat preferences and molecular data identified four species within I. cayanensis-chrysocephalus clade: an Amazonian species group, formed by I. cayanensis and I. chrysocephalus and a Southern species group composed of I. pyrrhopterus and I. tibialis. The Amazonian species are separated by a relatively narrow hybrid zone along the Amazon valley, whereas the Southern species are separated by a hybrid zone that is larger than the ranges of the two species individually.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 583-597 |
| Number of pages | 15 |
| Journal | Biological Journal of the Linnean Society |
| Volume | 95 |
| Issue number | 3 |
| DOIs | |
| State | Published - Nov 2008 |
| Externally published | Yes |
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Keywords
- Diversification
- Epaulet oriole
- Geographic variation
- Moriche oriole
- Neotropics
- Oriole
- Speciation
- Systematics
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
Cite this
Species limits and hybridization zones in Icterus cayanensis-chrysocephalus group (Aves : Icteridae). / D'Horta, Fernando Mendonça; Cardoso da Silva, Jose Maria; Ribas, Camila Cherem.
In: Biological Journal of the Linnean Society, Vol. 95, No. 3, 11.2008, p. 583-597.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Species limits and hybridization zones in Icterus cayanensis-chrysocephalus group (Aves
T2 - Icteridae)
AU - D'Horta, Fernando Mendonça
AU - Cardoso da Silva, Jose Maria
AU - Ribas, Camila Cherem
PY - 2008/11
Y1 - 2008/11
N2 - One of the best examples of differentiation and hybridization among South American passerine birds is exhibited by Icterus cayanensis (Epaulet Oriole) and Icterus chrysocephalus (Moriche Oriole). Icterus chrysocephalus is a monotypic species restricted to northern South America. Icterus cayanensis is a polytypc species that ranges from Suriname and French Guyana to northern Argentina. Five subspecies are recognized to I. cayanensis. Hybrid zones are known between I. cayanensis and I. chrysocephalus as well as between subspecies of I. cayanenis, even though character variation has never been adequately assessed and mapped. Although molecular data support the hypothesis that I. cayanensis and I. chrysocephalus form a monophyletic group, they do not support the species limits currently recognized within this group. We analysed the geographic variation of plumage characters along the range of this group to map the geographic variation of individual plumage characters and identify the populations that have uniform phenotypic character expression and therefore represent genuine phylogenetic species. We also used molecular data to investigate the phylogenetic relationships among these species. Geographic variation of plumage characters, habitat preferences and molecular data identified four species within I. cayanensis-chrysocephalus clade: an Amazonian species group, formed by I. cayanensis and I. chrysocephalus and a Southern species group composed of I. pyrrhopterus and I. tibialis. The Amazonian species are separated by a relatively narrow hybrid zone along the Amazon valley, whereas the Southern species are separated by a hybrid zone that is larger than the ranges of the two species individually.
AB - One of the best examples of differentiation and hybridization among South American passerine birds is exhibited by Icterus cayanensis (Epaulet Oriole) and Icterus chrysocephalus (Moriche Oriole). Icterus chrysocephalus is a monotypic species restricted to northern South America. Icterus cayanensis is a polytypc species that ranges from Suriname and French Guyana to northern Argentina. Five subspecies are recognized to I. cayanensis. Hybrid zones are known between I. cayanensis and I. chrysocephalus as well as between subspecies of I. cayanenis, even though character variation has never been adequately assessed and mapped. Although molecular data support the hypothesis that I. cayanensis and I. chrysocephalus form a monophyletic group, they do not support the species limits currently recognized within this group. We analysed the geographic variation of plumage characters along the range of this group to map the geographic variation of individual plumage characters and identify the populations that have uniform phenotypic character expression and therefore represent genuine phylogenetic species. We also used molecular data to investigate the phylogenetic relationships among these species. Geographic variation of plumage characters, habitat preferences and molecular data identified four species within I. cayanensis-chrysocephalus clade: an Amazonian species group, formed by I. cayanensis and I. chrysocephalus and a Southern species group composed of I. pyrrhopterus and I. tibialis. The Amazonian species are separated by a relatively narrow hybrid zone along the Amazon valley, whereas the Southern species are separated by a hybrid zone that is larger than the ranges of the two species individually.
KW - Diversification
KW - Epaulet oriole
KW - Geographic variation
KW - Moriche oriole
KW - Neotropics
KW - Oriole
KW - Speciation
KW - Systematics
UR - http://www.scopus.com/inward/record.url?scp=55349140797&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=55349140797&partnerID=8YFLogxK
U2 - 10.1111/j.1095-8312.2008.01059.x
DO - 10.1111/j.1095-8312.2008.01059.x
M3 - Article
AN - SCOPUS:55349140797
VL - 95
SP - 583
EP - 597
JO - Biological Journal of the Linnean Society
JF - Biological Journal of the Linnean Society
SN - 0024-4066
IS - 3
ER -