冰冻星球（2011）

Mum stays reassuringly close.
还在生长着保温油脂，
Still developing his insulating blubber,
幼崽有体温过低的风险
a pup is at risk of hypothermia
所以需要休息
so needs to rest
和暖身
and warm up.
每天，
Each day,
它又增加了两公斤...
he puts on another two kilos...
..和练习游泳
..and practises swimming
再长长一点
for just a little longer.
自出生以来，这只幼崽的体重增加了两倍，
Since birth, this pup has tripled in weight,
幼崽在这个好奇的世界里很安逸
and he's now at ease in this curious other world.
12天过去了
12 days gone by.
妈妈的抚养工作完成了
A mother's work is done.
在分泌乳汁的过程中，她减掉了三分之一的体重
In producing milk, she's lost a third of her body weight.
现在她必须回到觅食地
Now she must return to her feeding grounds.
她将再也见不到她的幼崽了， 回望无期......
She will never see her pup again.
接下来的四个星期它独自度过，
The next four weeks he spends alone,
紧贴冰台……
sticking close to the ice platform...
..靠它储备的脂肪生存
..surviving on his fat reserves
直到它的绒毛被一件光滑的外皮所取代
as his downy fleece is replaced by a sleek coat
这更适合游泳
more suited to swimming.
但现在北极的气温
But temperatures in the Arctic are now
上升速度比以往任何时候都快……
rising faster than ever before...
..每年早春，生成的风暴打碎浮冰
..creating storms that break up the ice floes earlier each spring.
竖琴海豹幼崽
Harp seal pups are being tipped into freezing waters
在它们未准备好长时间忍♥受大海之前，就被匆匆推入海水中
before they're ready to endure long periods at sea.
在一些幼崽区，几乎没有幼崽存活
In some pupping areas, almost none survive.
随着春夏交替，
As spring turns to summer,
海冰上的生命突然开始繁衍
life on the sea ice suddenly begins to proliferate.
日光逐渐增强，
The daylight increases,
一直处于休眠状态的藻类
and algae that had remained dormant
整个冬天都在冰里
within the ice all winter
现在开始开花
begin to bloom.
这片倒置的海草地现在通过浮游生物移植
This upside-down meadow is now cropped by plankton.
对于一个小骷髅虾
For a little skeleton shrimp
生活在“高耸”的海带森林的底部，
living at the bottom of a towering forest of kelp,
获得食物的最佳方式......
the best way to get a share of the food...
..是爬
..is to climb.
如果你只有两厘米长...
If you're only two centimetres long...
..这就像缩放摩天大楼
..this is like scaling a skyscraper.
然而，它并不孤单
And yet it's not alone.
数百只同类的虾
Hundreds of fellow shrimps
正尝试相同的攀爬
are attempting the same ascent.
一个新妈妈
A new mother
把她的孩子停在半路上
has parked her brood halfway up.
而且她不会让步
And she's not about to give way.
这是一个坚定的过客
This one is a determined commuter.
但是母亲有保护孩子的原始驱动力
But the mother's drive to protect her young
现在正在造成交通堵塞
is now causing a traffic jam.
最后...
At last...
许多虾已经到达了这个水下森林的最顶层分支
many have made it to the topmost branches of this underwater forest.
这是非常值得的
And it's been well worth the effort.
奖赏...
The prize...
是浮游生物盛宴...
is a plankton feast...
..从上面雨点般下来
..raining down from above.
到仲夏，北极水域充满着食物
By midsummer, Arctic waters are filled with food...
..使它们成为所有海洋中最富有的之一...
..making them into one of the richest of all oceans...
..喂养数十亿个微观嘴巴
..feeding billions of microscopic mouths
也喂养着...
as well as...
..地球上最大的嘴巴
..the biggest mouth on the planet.
北极露脊鲸 （弓头鲸 ）
The bowhead whale.
它四米长的鲸须板
Its four-metre-long baleen plates
使其每天能够筛选出
enable it to sieve out
多达六吨♥浮游生物
up to six tonnes of plankton a day.
它迅速成长为一个 18 米、100 吨♥重的巨物
And it grows swiftly into an 18-metre, 100-tonne giant.
在夏天，露脊鲸吃得很舒坦
In summer, the bowheads are so well fed
它们前往一年一度的聚会
they head for an annual get-together.
经过一年的耗损，
After a year of wear and tear,
它们的皮肤需要修复
their skin needs reconditioning.
这是一个鲸鱼健康水疗中心
This is a whale health spa.
浅滩的岩石和沙子像浮石一样使用
Rocks and sand in the shallows are used like pumice stones
用它擦去死皮和寄生虫
with which to rub off dead skin and parasites.
这样的地方会变得非常受欢迎
Such places can become very popular.
这个海湾，靠近俄♥罗♥斯♥海岸，
This bay, off the coast of Russia,
吸引了超过 50头露脊鲸的巨大聚会
attracts an immense gathering of over 50 bowheads.
它们是所有哺乳动物中寿命最长的
They are the longest-lived of all mammals.
有些已经200岁了
Some are 200 years old
并且已经来这里几十年了
and have been coming here for many decades.
突然...
Suddenly...
它们的平静被打破了
their peace is shattered.
虎鲸从南方来了……
Killer whales have arrived from the south...
..九米长，
..nine metres long,
重九吨♥……
weighing nine tonnes...
..并以其非凡的智慧而闻名
..and renowned for their exceptional intelligence.
这个特殊的虎鲸群专门用于狩猎
This particular pack specialises in hunting
露脊鲸
bowhead whales.
露脊鲸退入浅水区……
The bowheads retreat into the shallows...
..这会限制虎鲸发起的攻击
..where it will be harder for killer whales to launch an attack.
但虎鲸的游泳
But the killers can swim
比露脊鲸快得多
much faster than the bowheads.
露脊鲸群试图缩小队伍
The group tries to close ranks.
但虎鲸试图将它们分开
But the killers attempt to separate them.
虎鲸寻找单个露脊鲸显示出的
They look for individual signs
虚弱信♥号♥♥
of weakness.
在浅滩，露脊鲸......
In the shallows, the bowheads lash out...
..用它们七米宽的尾巴猛烈还击
..with their seven-metre-wide tails.
但局面混乱，
But in the confusion,
有些鲸搁浅
some run aground.
其它鲸试图到达更深的水域
Others try to reach deeper water.
这个只有成年鲸一半大小的年轻鲸鱼，
This youngster, half the size of an adult,
非常脆弱
is extremely vulnerable.
虎鲸们
The killer whales
轮流撞向它的一侧...
take turns to ram into its sides...
..裂化它的肋骨，让它呼吸困难
..cracking its ribs so that it struggles to breathe.
然后它们把年轻的鲸推♥翻♥，直到最后……
Then they push the youngster down until, finally...
..它淹死了
..it drowns.
战斗结束
The battle is over.
前后持续了一个小时
It lasted an hour.
然而现在虎鲸只吃掉猎物的一部分……
Yet now the killer whales eat only one part of their prey...
..年轻鲸柔软而肥腻的舌头
..the young bowhead's soft, fatty tongue.
今天，越来越多的露脊鲸
Today, more and more bowheads
正在成为虎鲸的猎物
are falling prey to killer whales
随着气候变暖
as the warming climate
能够作为保护屏障的海冰
causes the protective barrier of sea ice
每年过早地融化
to melt earlier each year.
到仲夏，数以百万计的海鸟迁徙，
By midsummer, millions of migratory sea birds,
飞越几千里到达这里，
having flown thousands of miles to get here,
在北极丰富的水域中觅食
are feeding in the Arctic's rich waters.
甚至超过一百万
Over a million
凤头海雀，不比海雀大，
crested auklets, no bigger than puffins,
现在降落在阿♥拉♥斯加的圣劳伦斯岛
now descend on Alaska's Saint Lawrence Island
准备繁殖
and are preparing to breed.
为了赢得配偶，雄性必须尝试
To win a mate, a male must try
从鸟群中脱颖而出
to stand out from the crowd.
面试已经在进行中
And auditions are already under way.
不同寻常的是，雄鸟和雌鸟看起来非常相似，
Males and females, unusually, look very similar,
每个都装饰有猫王般的徽章
each adorned with an Elvis-like crest.
但主要的是鸟冠的大小
But it's the size of the crest that matters.
而这个雄鸟的头饰似乎是
And this male's headgear seems to be
不足够大
no more than adequate.
在地面上的位置也很重要