bovine coccidia in american bison.three species of coccidia, found in american bison sampled in wyoming, are identified. the described coccidial species, common to cattle, have not been reported previosuly from american bison, (bison bison). identification of the parasites was determined by oocyst structural measurements and by oocyst sporulation times.19751152181
further studies on trypanosomes in game animals in wyoming ii.further studies on moose revealed trypanosomes in two captive moose (alces alces shirasi) and in 4 of 7 free-ranging moose in wyoming by blood culture. two free-ranging moose from utah were negative. one of two additional captive moose calves was positive for trypanosomes. trypanosomes also were detected in blood cultures of 8 of 39 american bison (bison bison) being brought into wyoming from nebraska. nineteen additional bison were negative for trypanosomes by blood cultures. identification of ...19817338978
abortion caused by brucella abortus biovar 1 in a free-ranging bison (bison bison) from yellowstone national park.a near-term aborted bison (bison bison) fetus was collected near old faithful geyser in yellowstone national park, wyoming (usa). on necropsy, the fetus liver had a small capsular tear, and there was a small quantity of blood in the peritoneal cavity. microscopic lesions included mild, purulent bronchopneumonia and mild, multifocal, interstitial pneumonia. brucella abortus biovar 1 was isolated from fetal abomasal contents, lung, and heart blood.19947933293
brucellosis in free-ranging bison (bison bison) from teton county, wyoming.brucellosis was studied opportunistically in bison (bison bison) in the free-ranging jackson herd of approximately 120 in teton county, wyoming (usa) in march 1989. recent abortion was diagnosed in a 2-yr-old cow and brucella abortus biovar 1 was isolated from vaginal discharge, uterine contents, uterus, and supramammary lymph nodes. endometritis was characterized by lymphoplasmacytic infiltrates in the lamina propria and neutrophils in uterine glands and within necrotic debris and exudate in th ...19938445770
brucellosis in free-ranging bison (bison bison) in yellowstone, grand teton, and wood buffalo national parks: a review. 19958592398
serologic survey for infectious pathogens in free-ranging american bison.from november 1991 through march 1992, we evaluated 101 free-ranging american bison (bison bison) from yellowstone national park, wyoming (usa) for exposure to infectious organisms that commonly infect cattle. no titers were detected for bluetongue virus, bovine leukemia virus, or campylobacter fetus in these 101 bison. detectable antibodies occurred against anaplasma marginale (eight of 76, 11%), bovine respiratory syncytial virus (31 of 101, 31%), bovine viral diarrhea (31 of 101, 31%), bovine ...19979131564
brucellosis in captive rocky mountain bighorn sheep (ovis canadensis) caused by brucella abortus biovar 4.nine (four female, five male) captive adult rocky mountain bighorn sheep (ovis canadensis) contracted brucellosis caused by brucella abortus biovar 4 as a result of natural exposure to an aborted elk (cervus elaphus) fetus. clinical signs of infection were orchitis and epididymitis in males and lymphadenitis and placentitis with abortion in females. gross pathologic findings included enlargement of the testes or epididymides, or both, and yellow caseous abscesses and pyogranulomas of the same. b ...200415362833
assessment of prey vulnerability through analysis of wolf movements and kill sites.within predator-prey systems behavior can heavily influence spatial dynamics, and accordingly, the theoretical study of how spatial dynamics relate to stability within these systems has a rich history. however, our understanding of these behaviors in large mammalian systems is poorly developed. to address the relationship between predator selection patterns, prey density, and prey vulnerability, we quantified selection patterns for two fine-scale behaviors of a recovering wolf (canis lupus) popu ...200616705979
brucellosis in elk of eastern idaho.brucellosis occurs in free-ranging elk (cervus elaphus) and bison (bison bison) in the greater yellowstone area, which includes portions of idaho, wyoming, and montana. brucella abortus was first detected in elk in idaho in 1998, and from 1998 to 2002, serologic surveillance of hunter-killed elk was conducted in northeastern and southeastern idaho. prevalence of antibodies in these elk varied annually, but averaged between 2% and 3%. elk were also trapped in northeastern idaho from 1998-2002 and ...200616870849
temporal variability in winter travel patterns of yellowstone bison: the effects of road grooming.the influence of winter recreation on wildlife in yellowstone national park (ynp), wyoming and montana, usa, is a controversial issue. in particular, the effects of road grooming, done to facilitate snowmobile and snowcoach travel, on bison (bison bison) ecology are under debate. we collected data during winters, from 1997 to 2005, on bison road use, off-road travel, and activity budgets to quantify temporal trends in the amount of bison road and off-road travel and to identify the ecological fa ...200616937817
covariates affecting spatial variability in bison travel behavior in yellowstone national park.understanding mechanisms influencing the movement paths of animals is essential for comprehending behavior and accurately predicting use of travel corridors. in yellowstone national park (usa), the effects of roads and winter road grooming on bison (bison bison) travel routes and spatial dynamics have been debated for more than a decade. however, no rigorous studies have been conducted on bison spatial movement patterns. we collected 121 380 locations from 14 female bison with gps collars in cen ...200717708218
vaccination strategies for managing brucellosis in yellowstone bison.concerns over migratory bison (bison bison) at yellowstone national park transmitting brucellosis (brucella abortus) to cattle herds on adjacent lands led to proposals for bison vaccination. we developed an individual-based model to evaluate how brucellosis infection might respond under alternate vaccination strategies, including: (1) vaccination of female calves and yearlings captured at the park boundary when bison move outside the primary conservation area; (2) combining boundary vaccination ...201020362620
status of brucellosis in free-ranging elk and bison in wyoming.brucella abortus is the causative agent of brucellosis, a disease enzootic in populations of free-ranging elk (cervus elaphus) and bison (bison bison) in the greater yellowstone ecosystem, usa. we define the distribution of the disease in elk throughout wyoming, usa, using three epidemiologic/geographic classifications based on winter-foraging opportunity. antibody prevalence for >3,300 yearling and adult, female elk, sampled from supplemental feedgrounds in western wyoming, usa, since 1985, was ...201020688637
predicting bison migration out of yellowstone national park using bayesian models.long distance migrations by ungulate species often surpass the boundaries of preservation areas where conflicts with various publics lead to management actions that can threaten populations. we chose the partially migratory bison (bison bison) population in yellowstone national park as an example of integrating science into management policies to better conserve migratory ungulates. approximately 60% of these bison have been exposed to bovine brucellosis and thousands of migrants exiting the par ...201121340035
brucellosis transmission between wildlife and livestock in the greater yellowstone ecosystem: inferences from dna genotyping.the wildlife of the greater yellowstone ecosystem carries brucellosis, which was first introduced to the area by cattle in the 19th century. brucellosis transmission between wildlife and livestock has been difficult to study due to challenges in culturing the causative agent, brucella abortus . we examined b. abortus transmission between american bison ( bison bison ), rocky mountain elk ( cervus elaphus nelsoni), and cattle ( bos taurus ) using variable number tandem repeat (vntr) markers on dn ...201728118557
diet segregation in american bison (bison bison) of yellowstone national park (wyoming, usa).body size is a major factor in the nutritional ecology of ruminant mammals. females, due to their smaller size and smaller rumen, have more rapid food-passage times than males and thereby require higher quality forage. males are more efficient at converting high-fiber forage into usable energy and thus, are more concerned with quantity. american bison are sexually dimorphic and sexually segregate for the majority of their adult lives, and in yellowstone national park, they occur in two distinct ...201728705156
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