Bird migration, a perilous journey - Alyssa Klavans

鳥類遷徒,一段冒險旅程 - Alyssa Klavans

252,715 views ・ 2013-09-17

TED-Ed


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譯者: Marssi Draw 審譯者: Shelly Wang
00:06
Each spring, nature lovers eagerly greet the signs
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每年春天,愛好大自然的人們渴望見到
00:09
that winter is finally coming to an end.
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冬天終於結束的徵兆
00:12
As the days grow warmer,
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隨著天氣逐漸暖和
00:13
the flowers and trees start to bloom,
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花朵和樹木開始萌芽
00:15
and the world comes alive
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世界開始生氣勃勃
00:16
with the melodious call of birds
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悅耳動人的小鳥開始鳴唱
00:18
in search of a new mate.
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尋找著新伴侶
00:20
But where have these enchanting sounds
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但是這些動人的歌聲
00:21
been hiding all winter?
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在冬天時躲到哪裡去了?
00:23
For almost 200 species of song birds,
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近 200 種鳴鳥
00:26
their winters have been spent
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在冬天時飛往
00:27
down in the tropical climates
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位於熱帶氣候區
00:28
of Central and South America.
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的中南美洲
00:31
While this may sound ideal,
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這聽起來可能不切實際
00:32
it involves one of the most perilous journeys
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因為這在整個動物王國中
00:35
known in the entire animal kingdom.
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是一段非常危險的旅程
00:38
This journey is called migration,
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這趟旅程稱為遷徒
00:40
and for song birds,
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而對鳴鳥來說
00:41
this can involve travelling somewhere
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這可能意謂著要飛行
00:43
between a few hundred to almost 7,000 miles
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幾百哩到近七千哩的距離
00:45
in a period of several weeks
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長達數週
00:47
to four months.
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到四個月之久
00:48
Birds spend weeks preparing
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鳥兒花費數週時間
00:50
for the intense journey
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吞下極大量的食物
00:51
by gorging on large quantities of food,
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為準備這趟艱辛的旅程
00:53
sometimes doubling their weight
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有時在出發前
00:54
prior to departure.
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要讓體重加倍
00:56
While flying, birds can lose
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在飛行時,鳥類幾乎每小時
00:58
almost one percent of their body weight an hour,
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可以消耗 1% 的體重
01:00
so packing on the pounds is crucial to their survival.
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因此增重對牠們是否能存活十分關鍵
01:04
However, more than the physical stress,
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然而,比身體壓力更困難的是
01:06
migrating birds are now facing
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鳥類遷徒正面臨著
01:08
a new source of hardship:
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一種新的困境:
01:09
landscape change.
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景觀變化
01:11
Just imagine you're the one
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想像一下
01:13
getting ready to take a trip.
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你是準備去旅行的人
01:14
You've packed the car
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你把所有可能
01:15
with everything you think you need,
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需要的東西放上車
01:17
fueled up the tank,
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加了油
01:18
eaten a huge breakfast,
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吃了超大份早餐
01:19
and hit the road.
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然後上路去
01:21
You've taken this journey before.
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你以前走過這趟路
01:22
You know all your favorite rest stops
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你知道你最愛的歇腳處
01:24
and little back-alley diners to grab a bite.
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還有可以吃上一頓的獨家晚餐
01:27
Everything is planned out.
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所有的事都計畫好了
01:29
But just as your fuel gauge starts
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但是當你的油表
01:30
dipping into the red zone,
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開始掉到紅線區
01:32
you pass by what should have been a gas station,
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你經過了印象中該有的那間加油站
01:34
except it's closed.
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可是它早就關了
01:36
"Not a problem," you think,
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你想:「沒問題。」
01:37
"The next one can't be too far away."
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「下一間不會太遠。」
01:39
But then that next station never appears.
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但是下一間加油站永遠都沒出現
01:42
Unfortunately, as you continue on your route,
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不幸的是,當你繼續走
01:44
the reality of the situation starts to set in.
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現實的情況上演
01:47
More and more stations are closed
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越來越多的加油站關門
01:49
or just erased from your map.
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或是消失在你的地圖上
01:51
All of a sudden, your routine trip
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突然之間
01:53
has become a desperate search
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你的旅程變成緊急搜尋
01:55
just to find somewhere safe to rest
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只為了找到一個安全的地方
01:57
and refuel for the night.
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休息、加油和過夜
01:59
This scenario has become the reality
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這個場景成為了
02:01
for the majority of migrating song birds
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大多數鳴鳥的現實情節
02:03
as human land development continues unchecked.
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當人類無止境地開發土地之際
02:06
Humans are altering important stop-over sites
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人類改變了鳥類使用了
02:09
that birds have been using for generations.
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好幾個世代的重要的中繼站
02:11
As migrators pass over the continent,
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當候鳥飛越大陸
02:14
they run a gauntlet of dangers,
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牠們冒著生命危險
02:15
including pesticide ingestion in rural farmlands,
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包含了吸入鄉間農園裡的農藥
02:18
habitat loss in suburban developments,
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郊區開發使得棲息地喪失
02:21
as well as disorientation from light pollution,
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還有在光害中迷失方向
02:23
and even structure collision
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甚至是撞上城市中
02:25
with tall, reflective glass buildings in cities.
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又高又閃亮的玻璃高樓
02:28
Of the estimated 20 billion individual birds
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秋天時鳥類總數
02:31
that comprise the fall population,
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大約有 200 億隻左右
02:33
only about half will return
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但是只有一半的鳥會回來
02:35
to breed the following spring.
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迎接下一個春天
02:37
Almost one billion of these deaths
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幾乎有 10 億隻鳥類
02:39
are attributed just to building collisions.
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因為撞上大樓而死亡
02:42
With such astounding yearly losses,
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隨著每年如此驚人的損失
02:44
humans risk more than just the loss
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人類冒的險
02:45
of the beautiful colors and songs of birds,
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不只是失去了鳥類美麗的色彩和歌聲
02:48
they also play an important role in the ecosystem.
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牠們在生態中也佔了極重要的地位
02:51
Birds help with insect control,
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鳥類幫助控制昆蟲
02:53
pollination,
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植物授粉
02:54
and disbursing seeds throughout the landscape.
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還有在各地播下種子
02:56
Without birds, the natural world
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沒有了鳥類,大自然
02:58
would be a very different place.
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會變得非常不一樣
03:00
Although birds face an on-going threat
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雖然鳥類持續面臨
03:02
from human land development,
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人類土地開發的威脅
03:03
there are actions that we can all take to help.
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還有我們幫得上忙的行動
03:06
Many countries and local governements
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許多國家和地方政府
03:07
have already passed important laws
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已經通過重要的法令
03:09
that restrict the use of poisonous pesticides.
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限制有毒的農藥
03:12
By using more natural, plant-based products,
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藉由使用自然、植物製品
03:14
we can maintain our farms and gardens
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我們可以維護農場和花園
03:16
without the dangerous side effects.
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又不會有危險的副作用
03:18
In addition, as our global populations continue to grow
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此外,當全球人數持續增加
03:21
and people need places to call home,
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人們都需要一個稱為家的地方
03:23
green spaces can offer both bird habitat
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綠地能夠提供鳥類棲息
03:26
as well as a peaceful and natural place
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同樣也能成為一個安寧的自然環境
03:28
for us to enjoy.
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讓我們享受其間
03:30
Small changes at home
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在家裡做小小的改變
03:31
can also make a huge difference.
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也能帶來大大的不同
03:33
By hanging up feeders
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你可以掛上餵食箱
03:34
and building bird houses in outdoor areas,
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為鳥類在戶外蓋一個家
03:36
we can provide much-needed food and safety
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我們能夠在長期的遷徒途中
03:38
during long migrations.
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提供足夠的食物和安全
03:41
Turning out lights in suburban
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關上郊區
03:43
and urban environments
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03:43
can also help birds
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和城市的路燈
也能幫助鳥類
03:45
that look for stars to navigate.
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找到指引方向的星星
03:47
With our help, these sky travellers
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藉由我們的幫助,在天空的旅行家
03:49
can reach their destination safely,
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能夠安全地抵達目的地
03:51
and hopefully keep returning year after year.
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但願牠們每一年都能回來
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