Visitor Counter

hitwebcounter web counter
Visitors Since Blog Created in March 2010

Click Below to:

Add Blog to Favorites

Grizzly bears, black bears, wolves, coyotes, cougars/ mountain lions,bobcats, wolverines, lynx, foxes, fishers and martens are the suite of carnivores that originally inhabited North America after the Pleistocene extinctions. This site invites research, commentary, point/counterpoint on that suite of native animals (predator and prey) that inhabited The Americas circa 1500-at the initial point of European exploration and subsequent colonization. Landscape ecology, journal accounts of explorers and frontiersmen, genetic evaluations of museum animals, peer reviewed 20th and 21st century research on various aspects of our "Wild America" as well as subjective commentary from expert and layman alike. All of the above being revealed and discussed with the underlying goal of one day seeing our Continent rewilded.....Where big enough swaths of open space exist with connective corridors to other large forest, meadow, mountain, valley, prairie, desert and chaparral wildlands.....Thereby enabling all of our historic fauna, including man, to live in a sustainable and healthy environment. - Blogger Rick

Subscribe via email to get updates

Enter your email address:

Receive New Posting Alerts

(A Maximum of One Alert Per Day)

Saturday, November 30, 2013

Glacier National Park is now estimated to house 600 Black Bears, about 1 per 2167 acres(and in the wooded best Black Bear habitat about 1 Bear per 1857 acres)..................In various other parts of the USA, a higher density of 1 Black Bear per 664-1000 acres is the norm(e.g. Arkansas, Georgia).............U.S. Geological Survey Scientist Kate Kendall feels that the Glacier density is solid considering that the 300 Grizzlies also share the Park terrain with the Black Bears

Researchers estimate 600 black bears in Glacier Park - Daily Inter Lake: Local/Montana

Researchers estimate 600 black bears in Glacier Park
A trio of researchers recently concluded that Glacier National Park’s black bear population is about 600 — roughly one black bear for every 2,167 acres.
The study, conducted by U.S. Geological Survey scientist Kate Kendall and colleagues Amy McCleod and Jeff Stetz, is based on nearly 1,800 black bear hair samples collected during a 2004 grizzly bear DNA study.

Researchers gathered hair samples using “bear traps,” with a scent station used to attract bears inside a barbed wire fence that snagged their hair, or by attaching small pieces of barbed wire to rub trees. Both grizzly and black bears select trees they regularly like to rub on. DNA in the hair follicles was analyzed to identify species and sex as well as individual bears.

The study was initially designed to estimate the grizzly bear population in Glacier Park and the Northern Continental Divide Ecosystem.
But Kendall eventually was able to secure enough funding to look at the black bear population in the samples that were gathered in the Park. This is the first scientifically validated estimate for the black bear population and density in the Park.
Kendall said the study shows that the Park provides good black bear habitat and noted that the numbers are significant because black bears are sharing the Park with about 300 grizzly bears. Most black bears also do a remarkably good job of avoiding the 2 million people who visit the Park each year.
When researchers removed areas of the Park not considered good black bear habitat, the density rose to a little more than one black bear per 1,857 acres. Black bears are generally not found in treeless and barren habitat. Black bears are much better at climbing trees than grizzly bears, which is one way they are able to elude the larger grizzlies that have been known to kill and eat black bears.
Kendall, who is now retired, continues to analyze bear hair data gathered exclusively from rub trees over the course of the past few years. The hope is to use that DNA evidence to determine population trends over time.
Currently biologists monitor population trends by capturing bears in traps, radio collaring them and then monitoring them to see how long they live and how many offspring they produce. A DNA study, if it proves valid, is easier on the bears as they’re never handled by humans.
Peterson writes for the Hungry Horse News.

No comments: