Greenland's ice bears
نویسندگان
چکیده
منابع مشابه
Polar bears shift from thinning ice
A long-term study by the US Geological Survey (USGS) suggests that recent changes in the quality and availability of sea ice in northern Alaska are the most likely explanation for a decrease in female polar bears bringing up cubs on sea ice and an increase in basing themselves on land. Researchers from the USGS used satellite telemetry to evaluate changes in the distribution of female nesting s...
متن کاملPopulation genetics of ice age brown bears.
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 ...
متن کاملActivity and Movement Patterns of Polar Bears Inhabiting Consolidated versus Active Pack Ice
We investigated the influence of ice conditions on activity and movement patterns of polar bears in the CanadianWest Greenland Arctic. We used radiotelemetry data gathered over 11 years (1989–99) from 160 adult female polar bears to test for differences in movement and activity of bears inhabiting active ice and consolidated ice. Bears inhabiting active ice moved more than those inhabiting cons...
متن کاملConservation status of polar bears (Ursus maritimus) in relation to projected sea-ice declines
Loss of Arctic sea ice owing to climate change is the primary threat to polar bears throughout their range. We evaluated the potential response of polar bears to sea-ice declines by (i) calculating generation length (GL) for the species, which determines the timeframe for conservation assessments; (ii) developing a standardized sea-ice metric representing important habitat; and (iii) using stat...
متن کاملReduced body size and cub recruitment in polar bears associated with sea ice decline.
Rates of reproduction and survival are dependent upon adequate body size and condition of individuals. Declines in size and condition have provided early indicators of population decline in polar bears (Ursus maritimus) near the southern extreme of their range. We tested whether patterns in body size, condition, and cub recruitment of polar bears in the southern Beaufort Sea of Alaska were rela...
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ژورنال
عنوان ژورنال: Marine Pollution Bulletin
سال: 2016
ISSN: 0025-326X
DOI: 10.1016/j.marpolbul.2016.10.012