Featured Research

from universities, journals, and other organizations

Plant diseases may start chain of events to threaten your picnic basket

Date:
October 24, 2013
Source:
BioMed Central Limited
Summary:
Black bears in the Californian Sierra Nevada could be more likely to encounter humans as their natural food sources are threatened, according to an article published. Researchers used GPS collars to track the movements of black bears in Sequoia National Park while measuring the their natural food levels. By tracking the bears’ movements, researchers were able to relate the levels of food available to the bears, to their whereabouts at different times of the year.

Researchers used GPS collars to track the movements of black bears in Sequoia National Park while measuring the their natural food levels.
Credit: Mazur

Black bears in the Californian Sierra Nevada could be more likely to encounter humans as their natural food sources are threatened, according to an article published in the BioMed Central open access journal Animal Biotelemetry.

Related Articles


Researchers used GPS collars to track the movements of black bears in Sequoia National Park while measuring the their natural food levels. They monitored ten bears in 2005, then in 2006, they tagged five of those again, plus an additional five.

By tracking the bears' movements, researchers were able to relate the levels of food available to the bears, to their whereabouts at different times of the year. In summer, movements fell within a predictable range, but in the fall, the bears' movements varied depending on availability of acorns and sugar pine seeds.

In a year when acorn availability was lower during the fall, the bears remained in their summer range to feed on sugar pine seeds. Whereas in a fall season when acorns were plentiful, the bears travelled further outside their summer ranges to reach this food source.

Both of these important food sources are at risk -- sugar pines are vulnerable to white pine blister rust, a fungal pathogen, while oaks are currently at risk from fire exclusion, mule deer predation and potentially a pathogen causing sudden oak death.

The authors extrapolate that if both of these food sources are reduced, bears will travel farther to find the high-calorie foods they need to survive hibernation. This will put bears increasing in contact with humans, and human-bear incidents will likely increase.

mplications of the variable availability of seasonal foods on the home ranges of black bears, Ursus americanus, in the Sierra Nevada of California
Rachel Mazur, A P Klimley and Karen Folger
Animal Biotelemetry


Story Source:

The above story is based on materials provided by BioMed Central Limited. Note: Materials may be edited for content and length.


Journal Reference:

  1. Rachel Mazur, A P Klimley and Karen Folger. Implications of the variable availability of seasonal foods on the home ranges of black bears, Ursus americanus, in the Sierra Nevada of California. Animal Biotelemetry, October 2013

Cite This Page:

BioMed Central Limited. "Plant diseases may start chain of events to threaten your picnic basket." ScienceDaily. ScienceDaily, 24 October 2013. <www.sciencedaily.com/releases/2013/10/131024220920.htm>.
BioMed Central Limited. (2013, October 24). Plant diseases may start chain of events to threaten your picnic basket. ScienceDaily. Retrieved March 27, 2015 from www.sciencedaily.com/releases/2013/10/131024220920.htm
BioMed Central Limited. "Plant diseases may start chain of events to threaten your picnic basket." ScienceDaily. www.sciencedaily.com/releases/2013/10/131024220920.htm (accessed March 27, 2015).

Share This


More From ScienceDaily



More Plants & Animals News

Friday, March 27, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Lioness Has Rare Five-Cub Litter

Raw: Lioness Has Rare Five-Cub Litter

AP (Mar. 27, 2015) — A lioness in Pakistan has given birth to five cubs, twice the usual size of a litter. Queen gave birth to two other cubs just nine months ago. (March 27) Video provided by AP
Powered by NewsLook.com
Jockey Motion Tracking Reveals Racing Prowess

Jockey Motion Tracking Reveals Racing Prowess

Reuters - Innovations Video Online (Mar. 26, 2015) — Using motion tracking technology, researchers from the Royal Veterinary College (RVC) are trying to establish an optimum horse riding style to train junior jockeys, as well as enhance safety, health and well-being of both racehorses and jockeys. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Bear Cubs Tumble for the Media

Bear Cubs Tumble for the Media

Reuters - Light News Video Online (Mar. 26, 2015) — Two Andean bear cubs are unveiled at the U.S. National Zoo in Washington, D.C. Alicia Powell reports. Video provided by Reuters
Powered by NewsLook.com
Botswana Talks to End Illegal Wildlife Trade

Botswana Talks to End Illegal Wildlife Trade

AFP (Mar. 25, 2015) — Experts are gathering in Botswana to try to end the illegal wildlife trade that is decimating populations of elephants, rhinos and other threatened species. Duration: 01:05 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins