Ancient hybridization patterns between bighorn and thinhorn sheep

2021 ◽  
Vol 30 (23) ◽  
pp. 6273-6288
Author(s):  
Sarah H. D. Santos ◽  
Rhiannon M. Peery ◽  
Joshua M. Miller ◽  
Anh Dao ◽  
Feng‐Hua Lyu ◽  
...  
Keyword(s):  
Thinhorn Sheep ◽  
Ancient Hybridization

Diversification of the North American Doellingeria-Eucephalus Clade (Astereae: Asteraceae) Inferred from Molecular and Morphological Evidence

2019 ◽  
Vol 44 (4) ◽  
pp. 930-942
Author(s):  
Geraldine A. Allen ◽  
Luc Brouillet ◽  
John C. Semple ◽  
Heidi J. Guest ◽  
Robert Underhill
Keyword(s):  
North American ◽  
Sequence Data ◽  
Phylogenetic Analyses ◽  
Sister Group ◽  
Morphological Evidence ◽  
South American ◽  
New Combinations ◽  
The North ◽  
Hybridization Event ◽  
Ancient Hybridization

Abstract—Doellingeria and Eucephalus form the earliest-diverging clade of the North American Astereae lineage. Phylogenetic analyses of both nuclear and plastid sequence data show that the Doellingeria-Eucephalus clade consists of two main subclades that differ from current circumscriptions of the two genera. Doellingeria is the sister group to E. elegans, and the Doellingeria + E. elegans subclade in turn is sister to the subclade containing all remaining species of Eucephalus. In the plastid phylogeny, the two subclades are deeply divergent, a pattern that is consistent with an ancient hybridization event involving ancestral species of the Doellingeria-Eucephalus clade and an ancestral taxon of a related North American or South American group. Divergence of the two Doellingeria-Eucephalus subclades may have occurred in association with northward migration from South American ancestors. We combine these two genera under the older of the two names, Doellingeria, and propose 12 new combinations (10 species and two varieties) for all species of Eucephalus.

Ancient hybridization and mitochondrial capture between two species of chipmunks

2008 ◽  
Vol 17 (5) ◽  
pp. 1313-1327 ◽  
Author(s):  
JEFFREY M. GOOD ◽  
SARAH HIRD ◽  
NOAH REID ◽  
JOHN R. DEMBOSKI ◽  
SCOTT J. STEPPAN ◽  
...  
Keyword(s):  
Ancient Hybridization

scholarly journals Heritability of Horn Size in Thinhorn Sheep

2019 ◽  
Vol 10 ◽  
Author(s):  
Zijian Sim ◽  
David W. Coltman
Keyword(s):  
Thinhorn Sheep

The thermoregulatory potential of Ovis horn cores

2000 ◽  
Vol 78 (8) ◽  
pp. 1419-1426 ◽  
Author(s):  
Manfred Hoefs
Keyword(s):  
Heat Dissipation ◽  
Environmental Gradients ◽  
Exchange Capacity ◽  
Ovis Canadensis ◽  
Evolutionary Trend ◽  
Simple Index ◽  
Cranial Measurements ◽  
Heat Conservation ◽  
Thinhorn Sheep ◽  
Northwestern North America

Cranial measurements were taken from 378 Ovis skulls (258 male, 120 female), covering most subspecies of wild sheep. Horn core length and circumference data were used to estimate the core surface. This highly vascularized plexus constitutes the radiating area. A simple index of heat-exchange capacity was calculated by dividing the combined surfaces of two horn cores by the mass of the animal. This index provided a standard by means of which different types of sheep could be compared, as well as allowing the detection of correlations with environmental gradients, which would point to a thermoregulatory role for horn cores. It can be assumed that, for sheep living in cold climates, heat conservation is important, while for those living in hot environments, enhanced heat dissipation would be advantageous. Our data confirm this hypothesis. The thinhorn sheep (Ovis dalli and Ovis nivicola) of subarctic and arctic northwestern North America and northern Siberia have the smallest horn cores, with indices of 6.9-7.3 cm2/kg, while desert-dwelling types have indices of more than twice these values. For instance, the desert subspecies of the American bighorns (Ovis canadensis nelsoni, Ovis canadensis mexicana, Ovis canadensis cremnobates) have indices ranging from 15.1 to 16.5 cm2/kg. Other sheep types have indices of intermediate sizes. It is our position that this evolutionary trend to vary core size in response to ambient temperature is independent of a parallel trend to increase horn size for the benefit of enhancing reproductive success.

scholarly journals Whole Mitochondrial Genomic and Y-Chromosomal Phylogenies of Burmese Long-Tailed Macaque (Macaca fascicularis aurea) Suggest Ancient Hybridization between fascicularis and sinica Species Groups

2017 ◽  
Vol 109 (4) ◽  
pp. 360-371 ◽  
Author(s):  
Kazunari Matsudaira ◽  
Yuzuru Hamada ◽  
Srichan Bunlungsup ◽  
Takafumi Ishida ◽  
Aye Mi San ◽  
...  
Keyword(s):  
Macaca Fascicularis ◽  
Species Groups ◽  
Ancient Hybridization

A multi-locus phylogeny suggests an ancient hybridization event between Campephilus and melanerpine woodpeckers (Aves: Picidae)

2013 ◽  
Vol 67 (3) ◽  
pp. 578-588 ◽  
Author(s):  
Jérôme Fuchs ◽  
Jean-Marc Pons ◽  
Liang Liu ◽  
Per G.P. Ericson ◽  
Arnaud Couloux ◽  
...  
Keyword(s):  
Hybridization Event ◽  
Ancient Hybridization
Sign in / Sign up

Export Citation Format

Share Document