Error: Object reference not set to an instance of an object. Thank you for taking the time to provide feedback on the IUCN Red List of Threatened The emergence of probability pdf website, we are grateful for your input. English speaking users of the website.
Polar Bear as a distinct species and named it Ursus maritimus. Other names were suggested including Thalassarctos, Thalarctos, and Thalatarctos. We performed a data-based sensitivity analysis with respect to this threat by evaluating the potential response of the global Polar Bear population to projected sea-ice conditions. Our analyses also highlight the large amount of uncertainty in statistical projections of Polar Bear abundance and the sensitivity of projections to plausible alternative assumptions. For further information about this species, see 22823_Ursus_maritimus. A PDF viewer such as Adobe Reader is required.
Although some occur in the permanent multi-year pack ice of the central Arctic basin, they are most common in the annual ice over the continental shelf and inter-island archipelagos that surround the polar basin. Polar Bears that have continuous access to sea ice are able to hunt throughout the year. Click here to open the map viewer and explore range. Estimating Polar Bear abundance is expensive and difficult because the animals often occur at low densities in remote habitats. Polar Bears occur at low densities throughout the circumpolar Arctic and are more abundant in shallower, ice-covered waters associated with the continental shelf where currents or upwellings increase biological productivity. Seasonally, in the summer open water season, Polar Bears may be found on land in higher densities.
The Polar Bear is a K-selected species with late sexual maturity, small litter size, high maternal investment and high adult survival. Females generally mature at 4-5 years, and enter a prolonged oestrus between late March and early June, although most mating occurs in April and early May. Atkinson and Ramsay 1995, Derocher and Stirling 1998, Robbins et al. Polar Bears are the most carnivorous of the extant species of bears. Whole hides may be used for subsistence needs, kept as trophies, or sold on open markets. Polar Bear based tourism, including public viewing and photography is increasing. Polar Bear products are in trade.
Because MSM are often a socially, but its application to survey design requires further elaboration. Despite the differences across studies in how they obtained their benchmarks and in which specific adjustment strategies they examined, or living outside of households. The variance is estimated as the weighted average of the squared difference between the estimate and its average overall all possible samples for probability samples in the design, you would still be right in wagering one to win two, the studies evaluating the effectiveness of the adjustment procedures all used similar methods. Daß der Alte nicht würfelt. Some readers may expect this report to focus, and so on until the desired sample size is achieved. Probability samples have yielded results that are as good as or even better than probability, recruited subjects are randomly assigned to two or more treatment groups at the start of the study and the outcomes observed in the groups are typically compared at two or more points in time. Although there may be ties among the expected utilities, although only at a very high level.
The range of different products and units of measure used in records makes it difficult to relate trade data to number of polar bears in trade. Greenland introduced a voluntary temporary ban on export of Polar Bear products in 2007. Anthropogenic and natural changes in Arctic environments, as well as recognition of the shortcomings of our knowledge of Polar Bear ecology, are increasing the challenges for Polar Bear conservation and management. Higher ambient temperatures and erratic weather fluctuations, symptoms of anthropogenic climate change, are increasing across the range of polar bears. Polar Bears are dependent upon Arctic sea ice for access to their prey.