PolarBear
2016-10-30 01:29:02 0 举报AI智能生成
PolarBear，也被称为北极熊，是生活在北极地区的大型食肉动物。它们的体型庞大，成年雄性的体重可以达到400-600公斤，雌性则稍轻一些。PolarBear的皮肤是厚厚的白色或黄色，这使它们在冰雪覆盖的环境中具有极好的伪装能力。它们的皮毛下有一层厚厚的脂肪，可以抵御严寒的气候。PolarBear是优秀的游泳者，它们可以在冰冷的海水中连续游泳数小时。它们是孤独的动物，除了繁殖季节，大部分时间都是独自生活。PolarBear的主要食物是海豹，它们会利用自己的力量和速度，将海豹从冰洞中拖出来。然而，由于全球气候变暖，北极的冰层正在逐渐融化，这对PolarBear的生存构成了严重威胁。
作者其他创作
大纲/内容
Living condition
changes
habitat has been destroyed to some extent
Ice began to melt
lack of food
warming water
dangerous
Population
is significantly reduced in recent years
where
Arctic sea ice
survival rate of polar bears had varied significantly
high mortalitiy
because of
warming climate
Range
may be the main cause of mortality （Derocher & Stirling， 2011）
Juvenile polar bear have less survived from the hard environment
Environment
Importance
most basic prerequisite for the survival and development of human beings
why
provides the necessary resources and conditions for our survival and development
Protection
Practice
reduces environmental pollution
Significance
curb the trend of ecological deterioration
an important task of the government's social management
raises the public awareness for protecting environment
national policies
sustainable development strategies
Nature
gene flow between local populations of polar bears
a precious specie
vulnerability
food
primarily seals
ringed seals
beared seals
walrus
beluga whales
seabirds
fish
small mammals
clean carrion
in summer
eats berries or the roots of plants
at the end of spring and summer
go to the beach to get up and take up the minerals and vitamins
eating is affected by the earlier sea ice breakup
influences
population dynamics
species distributions
interactions
a disaster for Artic marine mammals
Hibernation
Local aestivation
Reproduction
Hunting
polygamy
reproduces in the spring
Infant mortality in Canada is about 10 to 30%
Life
自由主题
female bears stay in the cave
convert its subcutaneous fat stored in the body
to produce milk to feed the baby
to provide needed nutrition for their own
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