TY - JOUR
T1 - Molecular systematics of the Genus Sigmodon (Rodentia
T2 - Muridae): Evidence from the mitochondrial cytochrome-b gene
AU - Peppers, Lottie L.
AU - Carroll, Darin S.
AU - Bradley, Robert D.
N1 - Copyright:
Copyright 2005 Elsevier Science B.V., Amsterdam. All rights reserved.
PY - 2002
Y1 - 2002
N2 - Phylogenetic relationships of 11 species of cotton rats (Genus Sigmodon) were assessed using nucleotide variation in the mitochondrial cytochrome-b gene. Results of the phylogenetic analyses do not support the conventional composition of the Sigmodon hispidus and S. fulviventer species groups. Instead, 3 species groups are recognized: hispidus (S. alleni, S. arizonae, S. hirsutus, S. hispidus, S. mascotensis, S. ochrognathus, and S. toltecus), fulviventer (S. leucotis, S. fulviventer, and S. peruanus), and alstoni (S. alstoni). Sequence divergence values ranged from 8.7% to 21.2%, indicating that divergence events within the genus occurred approximately 2.5-5.6 × 106 years ago. Taxa comprising the alstoni and fulviventer groups appear to have evolved early, whereas members of the hispidus group evolved more recently. Molecular data reflect an early origin (7 × 106 years ago) and support the hypothesis that cotton rats may occupy a basal position among South American sigmodontines.
AB - Phylogenetic relationships of 11 species of cotton rats (Genus Sigmodon) were assessed using nucleotide variation in the mitochondrial cytochrome-b gene. Results of the phylogenetic analyses do not support the conventional composition of the Sigmodon hispidus and S. fulviventer species groups. Instead, 3 species groups are recognized: hispidus (S. alleni, S. arizonae, S. hirsutus, S. hispidus, S. mascotensis, S. ochrognathus, and S. toltecus), fulviventer (S. leucotis, S. fulviventer, and S. peruanus), and alstoni (S. alstoni). Sequence divergence values ranged from 8.7% to 21.2%, indicating that divergence events within the genus occurred approximately 2.5-5.6 × 106 years ago. Taxa comprising the alstoni and fulviventer groups appear to have evolved early, whereas members of the hispidus group evolved more recently. Molecular data reflect an early origin (7 × 106 years ago) and support the hypothesis that cotton rats may occupy a basal position among South American sigmodontines.
KW - Cytochrome b
KW - Molecular phylogenetics
KW - Sigmodon
KW - Systematics
UR - http://www.scopus.com/inward/record.url?scp=0036262372&partnerID=8YFLogxK
U2 - 10.1644/1545-1542(2002)083<0396:MSOTGS>2.0.CO;2
DO - 10.1644/1545-1542(2002)083<0396:MSOTGS>2.0.CO;2
M3 - Article
AN - SCOPUS:0036262372
VL - 83
SP - 396
EP - 407
JO - Journal of Mammalogy
JF - Journal of Mammalogy
SN - 0022-2372
IS - 2
ER -