polar bear population 2,000
Here, we used mark–recapture models to investigate the population dynamics of polar bears in the southern Beaufort Sea from 2001 to 2010, years during which the spatial and temporal extent of summer sea ice generally declined. The striped area on the left shows the Chukchi Sea polar bear subpopulation’s range. These projections were instrumental in the decision to list the polar bear as a threatened species under the U.S. The population was estimated to be somewhere around 20,000 to 23,000 or more in 2009. ANCHORAGE, Alaska — In a new polar bear study published today, scientists from the United States and Canada found that during the first decade of the 21st century, the number of polar bears in the southern Beaufort Sea experienced a sharp decline of approximately 40 percent. Polar bear science has come a long way since then.
Endangered Species Act.
Since 2005, however, the estimated global polar bear population has risen by more than 30% to about 30,000 bears, far and away the highest estimate in more than 50 years. In 2005, the official global polar bear estimate was about 22,500. This status table will be updated whenever there are new information available that is considered credible and valid by … Southern Beaufort Sea Polar Bear Population Declined in the 2000s. That’s the stunning population loss for polar bears in the southern Beaufort Sea. USGS Release - In a new polar bear study published today, scientists from the United States and Canada found that during the first decade of the 21st century, the number of polar bears in the southern Beaufort Sea experienced a sharp decline of approximately 40 percent. A new paper written by zoologist Dr Susan Crockford to mark International Polar Bear Day today has found that global polar bear numbers have continued to rise. Sea ice reaches south to the dotted line in winter, and retreats to the solid black line in summer. The fact is that in the 1960s we had no idea how many polar bears there were.
The following qualifier is also provided: The polar bear population in 2000 was around 17,000 to 19,000. "The U.S. That's a rough … Forty percent. In October 2019, the Polar Bear Specialist Group of the International Union for the Conservation of Nature (IUCN) released a new assessment of polar bears.
Data from conservation groups and the government show that the polar bear population is roughly five times what it was in the 1950s and three or four times what it was in the 1970s when polar bears became protected under international treaty. The right shows a closeup of the study area off Alaska’s coast. Low survival from 2004 through 2006 led to a 25–50% decline in abundance.
Note that the official polar bear population estimate is no longer said to be “20,000-25,000.” Instead, the IUCN PBSG simply state that the mid-point estimate is about 25,000, with no range given. Summary of polar bear population status per 2019 The present table has been developed during 2019, based on new criteria for status assessments .
The resulting stochastic population projections showed drastic declines in the polar bear population by the end of the 21st century. Even now, about half of our population estimates are only educated guesses. Summary of polar bear population status per 2019 The present table has been developed … White circles show where polar bears were tagged between 2008 and 2016. “By extrapolation, they arrived at a total polar bear population of 17,000 to 19,000 animals.
Polar bear assessment bring good and troubling news.
With a worldwide population of nearly 25,000, the polar bear is listed as Vulnerable.
Numbers have been steadily increasing since 2005, with 2018 data estimating the highest number of polar bears globally since they were protected by international treaty in 1973.
“Scott and others (1959) concluded that about 2,000 to 2,500 polar bears existed near the Alaskan coast,” said the Canadians.
Vspensky (1961) estimated the world polar bear population at …
The findings reveal the most up-to-date information for polar bear populations.
Back then, the best we had over most of the polar bear's range were uneducated guesses. Interior Secretary Dirk Kempthorne said at the department’s press conference that the polar bear population increased from "a low of about 12,000 in the late 1960s to approximately 25,000 …