Agriculture
Silk’s superpowers
Vitamin D-licious Mushrooms
Chicken Eggs as Drug Factories
Amphibians
Poison Dart Frogs
Tree Frogs
Bullfrogs
Animals
Missing Moose
A Grim Future for Some Killer Whales
Fishy Cleaners
Behavior
Mosquito duets
Lightening Your Mood
Surprise Visitor
Birds
Tropical Birds
Waterfowl
Cranes
Chemistry and Materials
Unscrambling a Gem of a Mystery
A Framework for Growing Bone
Supersonic Splash
Computers
Programming with Alice
Hubble trouble doubled
Galaxies far, far, far away
Dinosaurs and Fossils
The bug that may have killed a dinosaur
Dino Takeout for Mammals
Dinosaur Eggs-citement
E Learning Jamaica
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
2014 GSAT Results for Jamaican Kids
Results of GSAT are in schools this week
Earth
Wave of Destruction
Deep History
Science loses out when ice caps melt
Environment
Improving the Camel
Indoor ozone stopper
Plant Gas
Finding the Past
A Long Trek to Asia
Your inner Neandertal
Digging Up Stone Age Art
Fish
Sting Ray
Parrotfish
Marlin
Food and Nutrition
Packing Fat
Recipe for Health
Healing Honey
GSAT English Rules
Subject and Verb Agreement
Finding Subjects and Verbs
Order of Adjectives
GSAT Exam Preparation Jamaica
42,000 students will sit for the GSAT Exam in two weeks
Scotiabank Jamaica Foundation Grade Six Achievement Test (GSAT) Scholarships
Preparing for the GSAT Exam
GSAT Exams Jamaica Scholarships
GSAT Scholarship
GSAT Exam Preparation
Access denied - Disabled boy aces GSAT
GSAT Mathematics
42,000 students will sit for the GSAT Exam in two weeks
E Learning in Jamaica WIN PRIZES and try our Fun Animated Games
Prime Time for Cicadas
Human Body
Tapeworms and Drug Delivery
A Long Trek to Asia
Dreaming makes perfect
Invertebrates
Crustaceans
Fleas
Ants
Mammals
Wombats
African Zebra
Pitbulls
Parents
How children learn
Expert report highlights the importance to parents of reading to children!
The Surprising Meaning and Benefits of Nursery Rhymes
Physics
Spin, Splat, and Scramble
Road Bumps
The Particle Zoo
Plants
A Change in Leaf Color
Fast-flying fungal spores
Flower family knows its roots
Reptiles
Box Turtles
Anacondas
Lizards
Space and Astronomy
A Darker, Warmer Red Planet
Evidence of a Wet Mars
An Earthlike Planet
Technology and Engineering
Supersuits for Superheroes
Musclebots Take Some Steps
Weaving with Light
The Parts of Speech
What is a Preposition?
What is a Noun
What is a Verb?
Transportation
Middle school science adventures
Seen on the Science Fair Scene
Robots on a Rocky Road
Weather
Arctic Melt
A Change in Climate
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™