Polar bears in action!
نویسندگان
چکیده
منابع مشابه
Effects of climate change on polar bears.
In this article, we review the effects on polar bears of global warming that have already been observed, and try to evaluate what may happen to the polar bears in the future. Many researchers have predicted a wide range of impacts of climate change on polar bear demography and conditions. A predicted major reduction in sea ice habitat will reduce the availability of ice associated seals, the ma...
متن کاملNew support for polar bears and tigers
Agency (FSA), announced that meat and milk from cloned cows was safe to eat, a striking aspect of media activity was the contrast between fulsome reports in the ‘upmarket’ newspapers and minimal coverage in the mass circulation tabloids, some of which ignored the announcement entirely. Presumably this reflected their responses to inherently reassuring news. “Cloned meat declared safe to eat” ra...
متن کاملPolar 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 کاملMama Grizzly and the polar bears.
A recent paper on the matrilineal population history of two sister species, Ursus maritimus (polar bears) and Ursus arctos (brown bears), based on mtDNA sequence analysis, reveals a comparatively recent introgression. The authors propose that it represents a signature of environ mental stress in marginal habitats [1]. In a nutshell, it means that all modern polar bears probably belong to a mate...
متن کاملObservation of Adoption in Polar Bears (Ursus maritimus)
We observed a case of adoption of a single four-month-old polar bear cub (Ursus maritimus) into an existing litter of two cubs on Hopen Island, Svalbard. We believe the high density of maternity dens in the study area may increase the likelihood of natural adoption. Speculation about theoretical implications of adoption is of scientific interest. However, we believe that the probability of adop...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 2018
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.169987