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45 results for “bighorn sheep”
Modeling management strategies for chronic disease in wildlife: predictions for the control of respiratory disease in bighorn sheep
<p>1. Controlling persistent infectious disease in wildlife populations is an on-going challenge for wildlife managers and conservationists worldwide.</p> <p>2. Here, we develop a dynamic pathogen transmission model capturing key features of M. ovipneumoniae infection, a major cause of population declines in North American bighorn sheep (Ovis canadensis). We explore the effects of model assumptions and parameter values on disease dynamics, including density versus frequency dependent transmission, the inclusion of a carrier class versus a longer infectious period, host survival rates, disease-induced mortality and recovery rates, and the epidemic growth rate.</p> <p>3. We compare the effectiveness of a suite of management actions following an epidemic, including test-and-remove, depopulation-and-reintroduction, range expansion, herd augmentation, and density reduction.</p> <p>4. Our results suggest that test-and-remove, depopulation-and-reintroduction, and range expansion have the potential to facilitate recovery of persistently infected bighorn sheep herds post-epidemic. By contrast, augmentation could lead to worse outcomes than those expected in the absence of management. Management that improves host survival or reduces disease-induced mortality are also likely to improve population size and persistence of chronically infected herds.</p> <p>5. Dynamic transmission models like the one employed here offer a structured, logical approach towards exploring hypotheses and can serve as a basis for planning field experiments and adaptive management. Models should be used iteratively with the field empirical approaches to triangulate on better approaches to wildlife management.</p>
On following pages: 199. Kazakhstan Argali (Ovis collium); 200. Marco Polo Argali (Ovis poli); 201. Tibetan Argali (Ovis hodgsoni); 202. Altai Argali (Ovis ammon); 203. Gobi Argali (Ovis darwini); 204. Shansi Argali (Ovis jubata); 205. Snow Sheep (Owvis nivicola); 206. Bighorn Sheep (Ovis canadensis); 207. Dall's Sheep (Ovis dalli). in Bovidae
On following pages: 199. Kazakhstan Argali (Ovis collium); 200. Marco Polo Argali (Ovis poli); 201. Tibetan Argali (Ovis hodgsoni); 202. Altai Argali (Ovis ammon); 203. Gobi Argali (Ovis darwini); 204. Shansi Argali (Ovis jubata); 205. Snow Sheep (Owvis nivicola); 206. Bighorn Sheep (Ovis canadensis); 207. Dall's Sheep (Ovis dalli).
Data from: Direct and indirect effects of cougar predation on bighorn sheep fitness
<div> <p>We sought to evaluate the direct and indirect fitness effects of intense cougar (<em>Puma concolor</em>) predation using 48 years of data on marked bighorn sheep (<em>Ovis canadensis</em>) in Ram Mountain, Alberta, Canada. We compared years of intense cougar predation with years with no or occasional cougar predation. We first quantified the effects of predation on neonatal, weaning, and overwinter lamb survival, three metrics potentially affected by direct and indirect effects. We then investigated the possible indirect effects of intense cougar predation on lamb production, female summer mass gain, and lamb mass at weaning. Indirect effects included a 14.2% decline in lamb production. Female summer mass gain decreased by 15.6 % and lamb mass at weaning declined by 8.0% in years of intense cougar predation. Here are the six datasets, joined with a README.md file for the data description, in addition to the six corresponding R scripts for replicating the results.</p> </div>
Data from: Whole-genome resequencing uncovers molecular signatures of natural and sexual selection in wild bighorn sheep
The identification of genes influencing fitness is central to our understanding of the genetic basis of adaptation and how it shapes phenotypic variation in wild populations. Here, we used whole-genome resequencing of wild Rocky Mountain bighorn sheep (Ovis canadensis) to >50-fold coverage to identify 2.8 million single nucleotide polymorphisms (SNPs) and genomic regions bearing signatures of directional selection (i.e. selective sweeps). A comparison of SNP diversity between the X chromosome and the autosomes indicated that bighorn males had a dramatically reduced long-term effective population size compared to females. This probably reflects a long history of intense sexual selection mediated by male–male competition for mates. Selective sweep scans based on heterozygosity and nucleotide diversity revealed evidence for a selective sweep shared across multiple populations at RXFP2, a gene that strongly affects horn size in domestic ungulates. The massive horns carried by bighorn rams appear to have evolved in part via strong positive selection at RXFP2. We identified evidence for selection within individual populations at genes affecting early body growth and cellular response to hypoxia; however, these must be interpreted more cautiously as genetic drift is strong within local populations and may have caused false positives. These results represent a rare example of strong genomic signatures of selection identified at genes with known function in wild populations of a nonmodel species. Our results also showcase the value of reference genome assemblies from agricultural or model species for studies of the genomic basis of adaptation in closely related wild taxa.
Data from: The genetic legacy of 50 years of desert bighorn sheep translocations
Conservation biologists have increasingly used translocations to mitigate population declines and restore locally extirpated populations. Genetic data can guide the selection of source populations for translocations and help evaluate restoration success. Bighorn sheep (Ovis canadensis) are a managed big game species that suffered widespread population extirpations across western North America throughout the early 1900's. Subsequent translocation programs have successfully re-established many formally extirpated bighorn herds, but most of these programs pre-date genetically-informed management practices. The state of Nevada presents a particularly well-documented case of decline followed by restoration of extirpated herds. Desert bighorn sheep (O. c. nelsoni) populations declined to less than 3,000 individuals restricted to remnant herds in the Mojave Desert and a few locations in the Great Basin Desert. Beginning in 1968, the Nevada Department of Wildlife translocated ~2,000 individuals from remnant populations to restore previously extirpated areas, possibly establishing herds with mixed ancestries. Here we examined genetic diversity and structure among remnant herds and the genetic consequences of translocation from these herds using a genotyping-by-sequencing approach to genotype 17,095 loci in 303 desert bighorn sheep. We found a signal of population genetic structure among remnant Mojave Desert populations, even across geographically proximate mountain ranges. Further, we found evidence of a genetically distinct, potential relict herd from a previously hypothesized Great Basin lineage of desert bighorn sheep. The genetic structure of source herds was clearly reflected in translocated populations. In most cases, herds retained genetic evidence of multiple translocation events and subsequent admixture when founded from multiple remnant source herds. Our results add to a growing literature on how population genomic data can be used to guide and monitor restoration programs.
Data for: Testing the match-mismatch hypothesis in bighorn sheep in the context of climate change
<p><span><span><span><span><span><span><span><span><span><span><span>In species with long gestation, females commit to reproduction several months before parturition. If cues driving conception date are uncoupled from spring conditions, parturition could be mistimed. Mismatch may increase with global change if the rate of temporal changes in autumn cues differs from the rate of change in spring conditions. Using 17 years of data on climate and vegetation phenology, we show that autumn temperature and precipitation, but not vegetation phenology, explain parturition date in bighorn sheep. Although autumn cues drive the timing of conception, they do not predict conditions at parturition in spring. We calculated the mismatch between individual parturition date and spring green-up, assessed whether mismatch increased over time and investigated the consequences of mismatch on lamb neonatal survival, weaning mass and overwinter survival. Mismatch fluctuated over time but showed no temporal trend. Temporal changes in green-up date did not lead to major fitness consequence of mismatch. Detailed data on individually marked animals revealed no effect of mismatch on neonatal or overwinter survival, but lamb weaning mass was negatively affected by mismatch. Capital breeders might be less sensitive to mismatch than income breeders because they are less dependent on daily food acquisition. Herbivores in seasonal environments may access sufficient forage to sustain lactation before or after the spring 'peak' green-up, and partly mitigate the consequences of a mismatch. Thus, the effect of phenological mismatch on fitness may be affected by species life-history, highlighting the complexity in quantifying trophic mismatches in the context of climate change. </span></span></span></span></span></span></span></span></span></span></span></p>
Data from: The genetic legacy of 50 years of desert bighorn sheep translocations
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Data from: Whole-genome resequencing uncovers molecular signatures of natural and sexual selection in wild bighorn sheep
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Data from: Trophy hunting mediates sex-specific associations between early-life environmental conditions and adult mortality in bighorn sheep
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Data from: Direct and indirect effects of cougar predation on bighorn sheep fitness
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Data for: Testing the match-mismatch hypothesis in bighorn sheep in the context of climate change
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Data from: Genomic consequences of genetic rescue in an insular population of bighorn sheep (Ovis canadensis)
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Data from: Assessing changes in functional connectivity in a desert bighorn sheep metapopulation after two generations
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Data from: Temporal dynamics of linkage disequilibrium in two populations of bighorn sheep
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Data from: Characterizing population and individual migration patterns among native and restored bighorn sheep (Ovis canadensis)
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Data from: Contact and contagion: bighorn sheep demographic states vary in probability of transmission given contact
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Modeling management strategies for chronic disease in wildlife: predictions for the control of respiratory disease in bighorn sheep
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Data from: Age-specific infectious period shapes dynamics of pneumonia in bighorn sheep
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Data from: Genomic analysis of morphometric traits in bighorn sheep using the Ovine Infinium® HD SNP BeadChip
Elucidating the genetic basis of fitness-related traits is a major goal of molecular ecology. Traits subject to sexual selection are particularly interesting, as non-random mate choice should deplete genetic variation and thereby their evolutionary benefits. We examined the genetic basis of three sexually selected morphometric traits in bighorn sheep (Ovis canadensis): horn length, horn base circumference, and body mass. These traits are of specific concern in bighorn sheep as artificial selection through trophy hunting opposes sexual selection. Specifically, horn size determines trophy status and, in most North American jurisdictions, if an individual can be legally harvested. Using between 7,994–9,552 phenotypic measures from the long-term individual-based study at Ram Mountain (Alberta, Canada), we first showed that all three traits are heritable (h2 = 0.15–0.23). We then conducted a genome-wide association study (GWAS) utilizing a set of 3,777 SNPs typed in 76 individuals using the Ovine Infinium® HD SNP BeadChip. We found suggestive association for body mass at a single locus (OAR9_91647990). The absence of strong associations with SNPs suggests that the traits are likely polygenic. These results represent a step forward for characterizing the genetic architecture of fitness related traits in sexually dimorphic ungulates.
Data from: "RAD Sequencing for SNP Discovery in Two Populations of Bighorn Sheep (Ovis canadensis)" in Genomic Resources Notes accepted 1 April 2013 - 31 May 2013
In this work we present the development of a large set of single nucleotide polymorphisms (SNPs) discovered in two populations of bighorn sheep (Ovis canadensis). To do so we used restriction-site associated DNA (RAD) sequencing of four individuals from each population. Through alignment of reads to the domestic sheep (Ovis aries) genome we discovered >83,000 SNPs, of which >38,000 are suitable for assays such as an Illumina SNP chip. These loci will allow for fine-mapping of loci associated with horn size, and examination of the consequences of the genetic rescue including mapping genes underling differences in life-history characteristics.
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