Results 71 to 80 of about 208,323 (200)

Use of exposure history to identify patterns of immunity to pneumonia in bighorn sheep (Ovis canadensis). [PDF]

PLoS ONE, 2013
Individual host immune responses to infectious agents drive epidemic behavior and are therefore central to understanding and controlling infectious diseases.
Raina K Plowright, Kezia Manlove, E Frances Cassirer, Paul C Cross, Thomas E Besser, Peter J Hudson   +5 more
doaj   +1 more source

SELECTION AND GENETIC (CO)VARIANCE IN BIGHORN SHEEP [PDF]

Evolution, 2005
Genetic theory predicts that directional selection should deplete additive genetic variance for traits closely related to fitness, and may favor the maintenance of alleles with antagonistically pleiotropic effects on fitness-related traits. Trait heritability is therefore expected to decline with the degree of association with fitness, and some genetic
David W, Coltman, Paul, O'Donoghue, John T, Hogg, Marco, Festa-Bianchet   +3 more
openaire   +2 more sources

Urbanization Drives Patterns of Individual Specialization but Not Dietary Diversity Among Coyotes

Ecology and Evolution, Volume 16, Issue 8, August 2026.
Niche partitioning and resource specialization can lead to spatial heterogeneity in trophic dynamics, but little is known about how these dynamics may change across landscapes of varying complexity. Urban ecosystems are characterized by a wider array of both natural and anthropogenic food sources, which can increase predator densities compared to ...
Samantha Erin Sophia Kreling, Ellen M. Reese, Olivia M. Cavalluzzi, Alexandra Renouard, Yasmine Hentati, Robert A. Long, Laura R. Prugh   +6 more
wiley   +1 more source

Reliability of tooth cementum rings to age bighorn sheep: a blind test

Tooth cementum rings often have been considered the most reliable method for aging larger mammals. Tests of this approach have used samples of known ages, but to ensure objectivity this needs to be carried out as truly blind tests.
Christopher J. O’Brien, John D. Wehausen, Dale R. McCullough   +2 more
core   +1 more source

Ancient hybridization patterns between bighorn and thinhorn sheep

, 2021
Whole-genome sequencing has advanced the study of species evolution, including the detection of genealogical discordant events such as ancient hybridization and incomplete lineage sorting (ILS).
Meng‐Hua Li, Xin Li, Dao, Anh, Feng‐Hua Lyu, Joshua M. Miller, Rhiannon M. Peery, Santos, Sarah H. D., Li, Xin, Coltman, David W., Li, Meng-Hua, Lyu, Feng-Hua, Sarah H. D. Santos, David W. Coltman, Miller, Joshua M., Anh Dao, Peery, Rhiannon M.   +15 more
core   +1 more source

Genetic linkage map of a wild genome: genomic structure, recombination and sexual dimorphism in bighorn sheep

BMC Genomics, 2010
Background The construction of genetic linkage maps in free-living populations is a promising tool for the study of evolution. However, such maps are rare because it is difficult to develop both wild pedigrees and corresponding sets of molecular markers ...
Miller Joshua M, Davis Corey S, Hogg John T, Poissant Jocelyn, Maddox Jillian F, Coltman David W   +5 more
doaj   +1 more source

Unraveling the Evolutionary History of Snow Sheep (Ovis nivicola): Genome‐Wide Single Nucleotide Polymorphism Analysis Reveals Genetic Diversity and Clarifies Taxonomy

Ecology and Evolution, Volume 16, Issue 8, August 2026.
This study chronicles all described subspecies of snow sheep (Ovis nivicola) since 1829, reviewing taxonomic assessments by key systematists. Using genome‐wide SNP genotyping on 337 samples from 15 populations, we validate and refine subspecies classifications, revealing eight genetic clusters and proposing a new subspecies (O. n. ernsti).
Arsen V. Dotsev, Innokentiy M. Okhlopkov, Mikhail G. Bondar, Dennis I. Litovka, Tatiana E. Deniskova, Veronika R. Kharzinova, Michael N. Romanov, Taras P. Sipko, Nikolai V. Mamaev, Maria N. Semerikova, Olga A. Koshkina, Neckruz F. Bakoev, Vugar A. Bagirov, Andrey A. Sitsko, Dmitry G. Medvedev, Alexander N. Kuksin, Mohammad Hossein Moradi, Ali Esmailizadeh, Darren K. Griffin, Henry Reyer, Klaus Wimmers, Gábor Mészáros, Johann Sölkner, Ivica Medugorac, Gottfried Brem, Natalia A. Zinovieva   +25 more
wiley   +1 more source

Cumulative Early‐Life Adversities Predict Short‐ and Long‐Term Survival in a Critically Endangered Lemur (Propithecus verreauxi)

Ecology and Evolution, Volume 16, Issue 8, August 2026.
Infant survival of wild Verreaux's sifakas was impacted by different cumulative indices of early adversities. Of the single factors, maternal loss, large group size and the absence of an older sibling decreased the odds of survival across the lifespan. Adversities early in life have persistent negative long‐term effects on survival.
Claudia Fichtel, Peter M. Kappeler
wiley   +1 more source

This is fine: Mule deer and elk do not substantially change their behavior in response to active wildfires

The Journal of Wildlife Management, Volume 90, Issue 6, August 2026.
During an outbreak of 7 wildfires in eastern Oregon, USA, we analyzed the home range and movement patterns of mule deer and elk before, during, and immediately after wildfires. Mule deer maintained high site fidelity during the wildfire but used their home range more uniformly and had higher daily displacement than deer unaffected by wildfire.
Jacob W. Dittel, Darren A. Clark
wiley   +1 more source

Could There Have Been 1.5 Million Bighorn Sheep in 1850? Most Likely Not!

Wild
There is little question that the distribution and numbers of large mammals have been altered by human activities. In North America, native ungulates have declined substantially since the mid-1800s. There is no baseline, however, against which to measure
Vernon C. Bleich, Stephen A. Holl
doaj   +1 more source