Dynamics of Pneumonia in a Bighorn Sheep Metapopulation

@inproceedings{Cassirer2007DynamicsOP,
  title={Dynamics of Pneumonia in a Bighorn Sheep Metapopulation},
  author={E. Frances Cassirer and Anthony R. E. Sinclair},
  year={2007}
}
Abstract We investigated the dynamics of 8 populations of a bighorn sheep (Ovis canadensis) metapopulation in Hells Canyon, USA from 1997 to 2003. Pneumonia was the most common cause (43%) of adult mortality and the primary factor limiting population growth. Cougar (Puma concolor) predation was the second most-frequent source (27%) of adult mortality but did not reduce the rate of population growth significantly. Most pneumonia-caused mortality occurred in fall and early winter and most cougar… Expand
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References

SHOWING 1-10 OF 37 REFERENCES
Ecological correlates of pneumonia epizootics in bighorn sheep herds
TLDR
The results suggest that bighorn sheep herds are rendered vulnerable to pneumonia principally through density-dependent factors, as well as through horizontal transmis - sion of Pasteurella spp. Expand
Mountain lion predation of bighorn sheep in the Peninsular Ranges, California
TLDR
It is proposed that a sustained high level of predation by mountain lions, such as was seen during this study, may impede the recovery of this population of bighorn sheep. Expand
Population growth, fecundity, and survivorship in recovering populations of bighorn sheep
TLDR
Disease was a significant limiting factor to restoration of bighorn sheep in the study areas; six of 11 total recovering populations the authors monitored closely were negatively influenced by apparent disease at some time during their observations. Expand
Survival and cougar predation of translocated bighorn sheep in Arizona
TLDR
It is suggested that recent increases in cougar predation in most areas of Arizona may be responsible for declining bighorn sheep numbers, and recent population declines in mule deer may beresponsible for recent increases of cougar Predation in Arizona. Expand
Cougar predation on bighorn sheep in southwestern Alberta during winter
TLDR
Cougar predation on bighorn sheep appears to be largely an individual, learned behaviour; most cougars rarely killed sheep, but some preyed heavily upon them. Expand
Interactive effects of sublethal nematodes and nutritional status on snowshoe hare vulnerability to predation
TLDR
The effect of sublethal nematode parasitism on hare survival can be important if interactive with predation, and that synergistic effects of parasitism and nutrition may affect hares if food availability is limited is concluded. Expand
Modeling demographic processes in an endangered population of bighorn sheep
TLDR
It is speculated that rescue effects, which are uncommon events for bighorn sheep, may be too rare or of inadequate magnitude under current conditions to effectively reverse bighORN sheep population declines. Expand
PATHOLOGIC CHANGES AND MICROORGANISMS FOUND IN BIGHORN SHEEP DURING A STRESS-RELATED DIE-OFF
An all-age die-off of Rocky Mountain bighorn sheep (Ovis c. canadensis Shaw) occurred from late October 1980 through March 1981 in Waterton Canyon, Colorado, with a loss of 75 to 85% of the sheep.Expand
EFFECTS OF AGE, SEX, DISEASE, AND DENSITY ON SURVIVAL OF BIGHORN SHEEP
TLDR
The data support the suggestion that where hunters remove many males older than 5 yr of age, the natural mortality of males increases at 3–5 yr, possibly because young males suffer a mortality cost of participating in rutting activity. Expand
Interactions Between Pathogens and Hosts: Simulation of Pasteurellosis Epizootics in Bighorn Sheep Populations
TLDR
A discrete-time, stochastic simulation model to represent interactions between pathogens and bighorn sheep populations suggests that fluctuations in bighORN abundance can be plausibly explained by internal properties of host-pathogen interactions. Expand
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