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28 results for “Ursus americanus”
Ursus americanus (Ursidae) - whole organism
Image of Ursus americanus (Ursidae) - whole organism
Fig. 2b in Tick abundance and life-stage segregation on the American black bear (Ursus americanus)
Fig. 2b. Diagram of tick segregation on American black bears, based on 17 body regions surveyed on black bears from June 2018–December 2019 in Pennsylvania, USA. Darker colors indicate higher percentages of adult ticks and lower percentages of immature ticks observed and lighter colors indicate lower percentages of adult ticks and higher percentages of immature ticks observed; based on percentages of adult ticks out of all ticks recorded in that body region (table). Percentages based on bears that had at least one tick recorded in the surveyed body locations. Body region descriptors- A: ear; B: cheek; C: neck; D: upper spine; E: lower spine; F: chest; G: front outer leg; H: front inner leg; I: front axillary region; J: front inner toes; K: stomach; L: hip; M: hind outer leg; N: hind inner leg; O: hind axillary region; P: hind inner toes; Q: muzzle. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
Fig. 3 in Tick abundance and life-stage segregation on the American black bear (Ursus americanus)
Fig. 3. Photograph of a bear with severe sarcoptic mange. Note the high loss of fur and thickened skin on the ears, face, and along the sides of the body and higher amounts of fur remaining along the spine and lower limbs. This pattern of hair loss and thickened crusting skin is typical for bears with moderate to severe cases of sarcoptic mange in Pennsylvania, with mild cases also frequently exhibiting higher hair loss and clinical signs of sarcoptic mange on the face and front regions of the body.
Fig. 2a in Tick abundance and life-stage segregation on the American black bear (Ursus americanus)
Fig. 2a. Diagram of tick abundance on American black bears, based on 17 body regions surveyed on black bears from June 2018–December 2019 in Pennsylvania, USA. Figure colors based on percentage of observed tick presence out of all observations of that body region (table), to represent where ticks were most frequently observed within the body regions surveyed. Darker colors indicate higher percentages of observations when ticks were present and lighter colors indicate lower percentages of observations that had ticks present in that body region. Body location descriptors- A: ear; B: cheek; C: neck; D: upper spine; E: lower spine; F: chest; G: front outer leg; H: front inner leg; I: front axillary region; J: front inner toes; K: stomach; L: hip; M: hind outer leg; N: hind inner leg; O: hind axillary region; P: hind inner toes; Q: muzzle. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
Fig. 1 in Tick abundance and life-stage segregation on the American black bear (Ursus americanus)
Fig. 1. Map of capture locations for bears surveyed for tick burden in Pennsylvania from June 2018–December 2019.
Data from: Residential development reduces black bear (Ursus americanus) opportunity to scavenge cougar (Puma concolor) killed prey
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Locations of black bear (Ursus americanus) reproduction in Nevada from camera-trap data
<p>Understanding factors creating species range boundaries is a fundamental goal of ecology and biogeography. American black bears recolonized the western Great Basin from the Sierra Nevada in the late 1900s but this expansion has not proceeded further into the Great Basin despite the presence of suitable habitat. We deployed 100 camera traps across the occupied range of black bears in the U.S. state of Nevada and tracked bear detections across 3 years. A scent lure was applied in camera trap viewsheds to increase bear detections. We classified detections of bear cubs separately from detections of only adult bears, to serve as an indicator of black bear reproduction occurring at sites. Data are provided in the format necessary for a analysis with multistate occupancy model. Analysis of these data revealed low incidence of reproduction at the periphery of black bear range in the western Great Basin, which likely contributes to range boundary formation.</p>
Ursus americanus (Ursidae) - whole organism
Image of Ursus americanus (Ursidae) - whole organism
Ursus americanus (Ursidae) - whole organism
Image of Ursus americanus (Ursidae) - whole organism
Ursus americanus (Ursidae) - whole organism
Image of Ursus americanus (Ursidae) - whole organism
Locations of black bear (Ursus americanus) reproduction in Nevada from camera-trap data
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Data from: Unraveling the mystery of the glacier bear: Genetic population structure of black bears (Ursus americanus) within the range of a rare pelage type
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Data from: Influence of drift and admixture on population structure of American black bears (Ursus americanus) in the Central Interior Highlands, U.S.A. 50 years after translocation
Bottlenecks, founder events, and genetic drift often result in decreased genetic diversity and increased population differentiation. These events may follow abundance declines due to natural or anthropogenic perturbations, where translocations may be an effective conservation strategy to increase population size. American black bears (Ursus americanus) were nearly extirpated from the Central Interior Highlands, USA by 1920. In an effort to restore bears, 254 individuals were translocated from Minnesota, USA and Manitoba, Canada, into the Ouachita and Ozark Mountains from 1958 to 1968. Using 15 microsatellites and mitochondrial haplotypes, we observed contemporary genetic diversity and differentiation between the source and supplemented populations. We inferred four genetic clusters: Source, Ouachitas, Ozarks, and a cluster in Missouri where no individuals were translocated. Coalescent models using approximate Bayesian computation identified an admixture model as having the highest posterior probability (0.942) over models where the translocation was unsuccessful or acted as a founder event. Nuclear genetic diversity was highest in the source (A = 9.11) and significantly lower in the translocated populations (A = 7.07 - 7.34; P = 0.004). The Missouri cluster had the lowest genetic diversity (A = 5.48) and served as a natural experiment showing the utility of translocations to increase genetic diversity following demographic bottlenecks. Differentiation was greater between the two admixed populations than between the source, suggesting that genetic drift acted strongly over the eight generations since the translocation. The Ouachitas and Missouri were previously hypothesized to be remnant lineages. We observed a pre-translocation remnant signature in Missouri but not in the Ouachitas.
Data from: Genetic and population monitoring of two small black bear (Ursus americanus) populations in Alabama, within a regional context.
One of the major concerns in conservation today is the loss of genetic diversity which is a frequent consequence of population isolation and small population sizes. Fragmentation of populations and persecution of carnivores has posed a substantial threat to the persistence of free ranging carnivores in North America since the arrival of European settlers. Black bears have seen significant reductions in range size from their historic extent, which is most pronounced in the southeastern United States and even more starkly in Alabama where until recently bears were reduced to a single geographically isolated population in the Mobile River Basin. Recently a second population has naturally re-established itself in northeastern Alabama. We sought to determine size, genetic diversity and genetic connectivity for these two populations in relation to other regional populations. Both populations of black bears in Alabama had small population sizes and had moderate to low genetic diversity, but showed different levels of connectivity to surrounding populations of bears. The Mobile River Basin population had a small population size at only 86 individuals (76-124, 95% C.I.), the lowest genetic diversity of compared populations (richness =2.33, Ho and He =0.33), and showed near complete genetic isolation from surrounding populations across multiple tests. The newly recolonizing population in northeastern Alabama had a small but growing population doubling in 3 years (34 individuals 26-43, 95% C.I.), relatively moderate genetic diversity compared to surrounding populations (richness = 3.32, Ho =0.53, He =0.65), and showed a high level of genetic connectivity with surrounding populations.
Human recreation impacts seasonal activity and occupancy of American black bears (Ursus americanus) across the urban-wildlife interface
<p>The datasets used for all analyses throughout the study that are downloaded from the Yooper Wildlife Watch Project found on Zooniverse. </p>
On following pages: 2. Andean Bear (Tremarctos ornatus); 3. Sun Bear (Helarctos malayanus); 4. Sloth Bear (Melursus ursinus); 5. Asiatic Black Bear (Ursus thibetanus); 6. American Black Bear (Ursus americanus). in Ursidae
On following pages: 2. Andean Bear (Tremarctos ornatus); 3. Sun Bear (Helarctos malayanus); 4. Sloth Bear (Melursus ursinus); 5. Asiatic Black Bear (Ursus thibetanus); 6. American Black Bear (Ursus americanus).
Data from: Intrinsic traits of woodland caribou Rangifer tarandus caribou calves depredated by black bears Ursus americanus and coyotes Canis latrans
Individuals in substandard physical condition are predicted to be more vulnerable to predation. Support for this prediction is inconsistent partly as a result of differences across systems in the life histories of predator and prey species. Our objective was to examine the physical condition of woodland caribou (Rangifer tarandus caribou) calves depredated by two predators with different life histories in Newfoundland, Canada. Black bears (Ursus americanus) are capable of chasing calves at high speeds over short distances and primarily prey on calves <1 month of age. Coyotes (Canis latrans) are cursorial predators that pursue prey over longer distances, which is expected to result in the selection of substandard individuals. We hypothesized that (i) black bears will kill calves in substandard physical condition, while (ii) coyotes will kill calves from across the distribution of individual conditions. We used mitochondrial DNA species identification tests to assign predator species to calf mortalities. We then used molecular identifications and field observations to build a predictive model using generalized boosted trees to predict the predator species where a molecular identification was unavailable. We tested our hypotheses using Cox proportional hazards models under a competing risks framework. Bears killed younger calves and lighter calves, while coyotes killed heavier calves. Coyotes also killed more late-born calves, which might suggest prey switching as calves become more abundant later in the season. Our findings suggest that the physical constraints of predators play a greater role than predator hunting strategies in this system, but other processes are likely influential. The tendency for coyotes to kill heavier calves might result from sustained coyote predation over time, following the removal by black bears of lighter calves during their first month of age. This research illuminates the complexity of predator-prey interactions in Newfoundland and highlights an important source of variability for predator-prey systems.
Data from: Genetic and population monitoring of two small black bear (Ursus americanus) populations in Alabama, within a regional context.
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Data from: Social network analysis of mating patterns in American black bears (Ursus americanus)
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Data from: Phylogeographic analyses of American black bears (Ursus americanus) suggest four glacial refugia and complex patterns of post-glacial admixture
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.