Agriculture
New Gene Fights Potato Blight
Middle school science adventures
Got Milk? How?
Amphibians
Poison Dart Frogs
Salamanders
Toads
Animals
Red Apes in Danger
Cool Penguins
Return of the Lost Limbs
Behavior
Slumber by the numbers
Homework blues
Seeing red means danger ahead
Birds
Kiwis
Swifts
Crows
Chemistry and Materials
Earth from the inside out
The Incredible Shrunken Kids
Revving Up Green Machines
Computers
New twists for phantom limbs
Getting in Touch with Touch
Games with a Purpose
Dinosaurs and Fossils
Winged Insects May Go Way Back
Battling Mastodons
Dino Flesh from Fossil Bone
E Learning Jamaica
Results of GSAT are in schools this week
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
2014 GSAT Results for Jamaican Kids
Earth
Hot Summers, Wild Fires
A Volcano's Deadly Ash
Polar Ice Feels the Heat
Environment
Pumping Up Poison Ivy
Missing Tigers in India
An Ocean View's Downside
Finding the Past
Words of the Distant Past
Ancient Art on the Rocks
Stone Tablet May Solve Maya Mystery
Fish
Tuna
Skates
Electric Eel
Food and Nutrition
Chocolate Rules
Food for Life
The Color of Health
GSAT English Rules
Subject and Verb Agreement
Finding Subjects and Verbs
Problems with Prepositions
GSAT Exam Preparation Jamaica
Tarrant High overcoming the odds
2014 GSAT Results for Jamaican Kids
GSAT stars reap scholarship glory
GSAT Exams Jamaica Scholarships
GSAT stars reap scholarship glory
GSAT Scholarship
GSAT Practice Papers | GSAT Mathematics | Maths
GSAT Mathematics
How a Venus Flytrap Snaps Shut
Math of the World
Prime Time for Cicadas
Human Body
Running with Sneaker Science
Kids now getting 'adult' disease
The tell-tale bacteria
Invertebrates
Giant Squid
Ants
Tarantula
Mammals
Armadillo
Goats
Siamese Cats
Parents
How children learn
Raise a Lifelong Reader by Reading Aloud
Choosing a Preschool: What to Consider
Physics
The Pressure of Scuba Diving
Hold on to your stars, ladies and gentlemen
One ring around them all
Plants
Pumping Up Poison Ivy
Stalking Plants by Scent
Cactus Goo for Clean Water
Reptiles
Crocodiles
Crocodilians
Cobras
Space and Astronomy
A Darker, Warmer Red Planet
Cousin Earth
Mercury's magnetic twisters
Technology and Engineering
Machine Copy
Crime Lab
Algae Motors
The Parts of Speech
Pronouns
Countable and Uncountable Nouns
Problems with Prepositions
Transportation
Tinkering With the Basic Bike
Robots on a Rocky Road
Ready, unplug, drive
Weather
The solar system's biggest junkyard
Arctic Melt
In Antarctica watch the heat (and your step)
Add your Article

Polar Bears in Trouble

Alaskan polar bears are masters of ice. Even during the frigid days of winter, these furry white creatures don't hibernate in cozy dens, like other bears do. Instead, they go north, hunting for seals living in the ice-covered water. In recent years, however, Earth's climate has been getting warmer, and ice near the Poles has been melting. Now, a new study by scientists at the U.S. Geological Survey (USGS) in Anchorage, Alaska, shows that disappearing ice is changing polar bear behavior. In particular, slightly more than half of pregnant polar bears used to give birth in dens on solid blocks of ice that were floating out at sea. Today, they're more likely to dig their dens on or near land. The consequences of the shift are unknown. When the scientists began this study, their goal was to see whether they could use radio collars that communicate with space satellites to see if bears were snuggled in dens. The collars worked. Over the course of testing, however, the researchers discovered some surprising data concerning the locations of these dens. Between 1985 and 1994, 62 percent of the dens that the satellite system detected were on floating sea ice. Between 1998 and 2004, however, only 37 percent of dens were floating out at sea. Disappearing ice is the best explanation for the shift, the researchers say. Other studies have shown that 27 percent of sea ice in the Arctic that stays frozen from year to year has disappeared during the past 30 years. So there's now much less space for dens. Moreover, as this permanent ice melts, the remaining ice becomes less stable. These conditions are unappealing to mother polar bears, who want a safe place to give birth and keep thir cubs in a protected den for several months. "If you're a mother bear, you probably want to be on ice that's pretty doggone stable," says USGS researcher Steven Amstrup. For now, Alaska's polar bears seem to prefer returning to land rather than taking the risk of giving birth on shaky ice. That solution might not work forever, however, especially if the ice keeps melting. "The biggest concern," Amstrup says, "is that [as] the ice continues to retreat, there may come a time when bears can't return to land." For polar bears, the future is uncertain, says polar bear researcher Ian Stirling of the Canadian Wildlife Service, based in Edmonton, Alberta. "As the climate is warming and we're losing ice," Sterling says, "you don't have to be a rocket scientist to know that that's going to have a significant negative effect on an animal that depends on ice for life."—Emily Sohn

Polar Bears in Trouble
Polar Bears in Trouble








Designed and Powered by HBJamaica.com™