Track topics on Twitter Track topics that are important to you
The abundance of ungulate populations may fluctuate in response to several limiting factors, including climate, diseases, and predation. In the northern Richardson Mountains, Canada, Dall sheep (Ovis dalli dalli) have undergone a major decline in the past decades and predation by grizzly bears (Ursus arctos) and wolves (Canis lupus) was suspected as a leading cause. To better understand the relationship between these three species located in this rugged and remote ecosystem, we relied on a combination of indirect methods. We investigated the apparent role of predation on the Dall sheep population using spatial ecology and stable isotopes. We examined seasonal variation in predation risk, focusing on how it may affect Dall sheep habitat use and sexual segregation, and we evaluated the proportion of Dall sheep in the diet of both predators using stable isotopes. The movements of the three species were monitored by satellite telemetry. Dall sheep habitat use patterns were analyzed using topographical features, greenness index, land cover, and apparent predation risk. The diets of grizzly bears and wolves were examined using a Bayesian mixing model for carbon and nitrogen stable isotopes. We found that Dall sheep habitat use varied seasonally, with different patterns for ewes and rams. Exposure to grizzly bear risk was higher for rams during summer, while ewes were further exposed to wolf apparent predation risk during winter. The importance of safe habitats for ewes was reflected in space use patterns. Stable isotopes analyses suggested that the diet of grizzly bears was largely from animal sources, with mountain mammals comprising about one quarter. Wolves mostly fed on both aquatic browsers and mountain mammals. Diet variation between individual predators suggested that some individuals specialized on mountain mammals, likely including Dall sheep. We conclude that grizzly bear and wolf apparent predation risk are important in driving Dall sheep habitat use and play a role in sexual segregation. Overall, this study presents an innovative combination of indirect methods that could be applied elsewhere to better understand predator-prey dynamics in remote ecosystems.
This article was published in the following journal.
Name: PloS one
Anaplasma ovis is a tick-borne obligate intracellular rickettsial bacterium that causes anaplasmosis in domestic and wild small ruminants. Sheep and goats, whose combined population is approximately 4...
Dall's porpoise (Phocoenoides dalli) is one of most common North Pacific porpoise species, for which information on sound-emitting processes is limited. To evaluate the mechanism of click emission in ...
The species of the genus Anaplasma are obligate intracellular pathogens that threaten the health of both humans and animals. In this study, we investigated the presence of Anaplasma phagocytophilum, A...
Bovine viral diarrhea virus (BVDV) and Mycobacterium avium subspecies paratuberculosis (MAP) are important pathogens, which cause serious disease in animals. However, information about BVDV and MAP in...
Thirty Nellore crossbred male sheep (Ovis aries) were divided into two groups of 15 animals each and subjected to either pre-slaughter electrical stunning followed by slaughter (ST) or traditional hal...
NASA has outlined the most urgent threats to life and health in manned spaceflight. One of the threats is the risk of trauma and acute medical problems. One of the most important provisio...
A 3-arm randomised controlled trial will be conducted to compare the effectiveness of a new enhanced Child Friendly Space service package with the basic Child Friendly Space service implem...
Patients in our department endoscopic thyroidectomy were randomly divided into high position and low position established operating space group established operating space group. The thyro...
Space maintainers are appliances that applied when primary teeth were lost prematurely because of many reasons such as tooth decay, trauma, lack of germ of permanent tooth.4 Space problems...
Over time there is a need to improve old and develop new risk models. The assessment of mortality risk in cardiac surgery is performed with the use of preoperative risk models. The use of ...
A species of sheep, Ovis aries, descended from Near Eastern wild forms, especially mouflon.
A species of sheep, Ovis canadensis, characterized by massive brown horns. There are at least four subspecies and they are all endangered or threatened.
Diseases of domestic and mountain sheep of the genus Ovis.
A species of the genus BRUCELLA which are pathogenic to SHEEP.
Any of the ruminant mammals with curved horns in the genus Ovis, family Bovidae. They possess lachrymal grooves and interdigital glands, which are absent in GOATS.
Arthritis Fibromyalgia Gout Lupus Rheumatic Rheumatology is the medical specialty concerned with the diagnosis and management of disease involving joints, tendons, muscles, ligaments and associated structures (Oxford Medical Diction...
The World Health Organization (WHO) definition of sexual health; "the state of physical, emotional, mental and social well-being related to sexuality; it is not merely the absence of disease, dysfunction and infirmity. Sexual health requires a posit...