نتایج جستجو برای: brown bear
تعداد نتایج: 67475 فیلتر نتایج به سال:
Abstract Context Romania is currently one of the best-connected landscapes, with high-quality habitats and a high density brown bears. However, regional development measures are needed for nation’s economic growth, without responsible government actions, these pose threat to bear connectivity, vital pillar entire Carpathian region. Despite having important implications species conservation, bea...
Cave bears (Ursus spelaeus) existed in Europe and western Asia until the end of the last glaciation some 10,000 years ago. To investigate the genetic diversity, population history, and relationship among different cave bear populations, we have determined mitochondrial DNA sequences from 12 cave bears that range in age from about 26,500 to at least 49,000 years and originate from nine caves. Th...
We reanalysed the spatial structure of the Scandinavian brown bear (Ursus arctos) population based on multilocus genotypes. We used data from a former study that had presumed a priori a specific population subdivision based on four subpopulations. Using two independent methods (neighbour-joining trees and Bayesian assignment tests), we analysed the data without any prior presumption about the s...
The Pleistocene was a dynamic period for Holarctic mammal species, complicated by episodes of glaciation, local extinctions, and intercontinental migration. The genetic consequences of these events are difficult to resolve from the study of present-day populations. To provide a direct view of population genetics in the late Pleistocene, we measured mitochondrial DNA sequence variation in seven ...
We provide the first known documentation of a fatal brown bear (Ursus arctos) poisoning with carbofuran (an acetylcholinesterase inhibitor) in Croatia. Diagnosis using liquid chromatography– mass spectrometry confirmed the presence of high concentrations of carbofuran in liver and kidney tissue (12.650 and 2.695 ppm, respectively). These measurements, combined with the very small distance betwe...
The causes of the late Pleistocene megafaunal extinctions are still enigmatic. Although the fossil record can provide approximations for when a species went extinct, the timing of its disappearance alone cannot resolve the causes and mode of the decline preceding its extinction. However, ancient DNA analyses can reveal population size changes over time and narrow down potential causes of extinc...
Dental data from 22 Swedish brown bears (Ursus arctos) were collected during April and May 2008, during the annual capture of free-ranging brown bears in Dalarna County, Sweden by the Scandinavian Brown Bear Research Project. The bears were of different genders and ages. All animals were weighed and subjected to physical examination and all were found to be in good condition. The oral cavity wa...
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