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 April 19, 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 April 19, 2015).

Share This


More From ScienceDaily



More Plants & Animals News

Sunday, April 19, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Un-Bee-Lievable: Bees on the Loose After Washington Truck Crash

Un-Bee-Lievable: Bees on the Loose After Washington Truck Crash

Reuters - US Online Video (Apr. 17, 2015) A truck carrying honey bees overturns near Lynnwood, Washington, spreading boxes of live bees across the highway. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Our Love Of Puppy Dog Eyes Explained By Science

Our Love Of Puppy Dog Eyes Explained By Science

Newsy (Apr. 17, 2015) Researchers found a spike in oxytocin occurs in both humans and dogs when they gaze into each other&apos;s eyes. Video provided by Newsy
Powered by NewsLook.com
Dog Flu Spreading in Midwestern States

Dog Flu Spreading in Midwestern States

AP (Apr. 17, 2015) Dog flu is spreading in several Midwestern states. Dog daycare centers and veterinary offices are taking precautions. (April 17) Video provided by AP
Powered by NewsLook.com
Raw: Rare Whale Spotted in Gulf of Mexico

Raw: Rare Whale Spotted in Gulf of Mexico

AP (Apr. 17, 2015) Researchers from the E/V Nautilus had quite a surprise Tuesday, when a curious sperm whale swam around their remotely operated vehicle in the Gulf of Mexico. Cameras captured the encounter. (April 17) Video provided by AP
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