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標題: [瞬間看地球] "精彩瞬間" 大白鯊獵食 [打印本頁]

作者: vandas    時間: 2012-7-24 01:29 PM     標題: "精彩瞬間" 大白鯊獵食

Awesome display as airborne Great White targets 'seal' for lunch... and  loses a tooth as it mercilessly chomps down on its prey
By Graham Smith

This is the astonishing moment a Great White shark jumps out of the sea to catch its prey - and loses a tooth in the process.

Nature's ultimate killing machine thought it  was about to enjoy a Cape fur seal for lunch, but instead chomped into a decoy used by a daredevil photographer patiently wanting to capture the perfect  shot.

Unfortunately for the shark, it chomped down so viciously that one of its teeth broke off and ended up flying through the  air.


No mercy: A Great White shark jumps out of the sea to catch its prey - and loses a tooth in the process


Vicious: With his tooth still flying through the air,  the shark chomps down to take its prey beneath the waves

The incident was  preserved by British  photographer Dan Callister, who regularly travels  to Seal Island near Cape  Town, South Africa.
Speaking shortly before his latest visit, Mr Callister said: 'I’m looking forward to  meeting up with some old friends above  and below the water.

'Hopefully the sharks will be on top form and  I  manage to get a usable frame or two, to add to the ongoing  project.'
Seal Island is well known for the spectacular  way the sharks grab their prey.

Coming up from underneath the waves, the  giant fish literally launch themselves out of the water with the seal in their  mouth.


Jaws: The shark bit into a decoy seal used by a  daredevil photographer patiently wanting to capture the perfect shot


Up close: British photographer Dan Callister, who  regularly travels to Seal Island near Cape Town, took these images


Hungry: Seal Island is well known for the spectacular way the sharks grab their prey

The area where the sharks circle the island  is known by locals as the 'Ring Of Death'.
If the seals enter this circle on the sea  surface instead of in the murky water near the bed, they are almost certain to  be picked off by a speedy and aggressive Great White.

Great whites come to the island to feed on  the 65,000 cape fur seals that live there.
When the seals leave the island to go out to  sea to feed they gather at a shallow reef just off the island nicknamed the  launch-pad. They stay in a groups making it hard for a shark to target an  individual.

However, the sharks cruise along the seabed  at the edge of the island where shallows drops off into deeper water. Targeting  lone stragglers or seals returning from a feed alone, great whites come from  below at great speed.

Often the impact takes both the shark and  seal airborne.


Success: Coming up from underneath the waves, the giant fish literally launch themselves out of the water with the seal in their mouth


Predator: The area where the sharks circle Seal Island  is known by locals as the 'Ring Of Death' for seals


Feeding frenzyL Great whites come to the island to eat some of the 65,000 cape fur seals that live there
作者: vandas    時間: 2012-7-24 01:29 PM

大白鯊,海洋中的霸王,因腹部通常呈現白色,所以得名“大白鯊”。從進化論的角度來看,數百萬年來,大白鯊的身體結構一直都沒有變化。

大白鯊是最大的獵食性魚類,由於大白鯊的上下顎並未和頭部緊密相連,牠可以將上顎向上和向前延伸吞下獵物,有時甚至能將獵物一口吞下,也可以一口氣吞下一整隻海豹。 由於大白鯊的上下顎並未和頭部緊密相連,牠可以將上顎向上和向前延伸吞下獵物。

大白鯊由於身體龐大,並不像其他鯊魚那麼靈活。但大白鯊卻是絕佳的獵人,因為牠總能出其不意或利用偽裝來獵食。

牠的上半身顏色很暗,下半身很明亮,牠們能藉著這種保護色悄悄的逼近獵物。當牠從下方來襲時,由於牠的顏色和深海接近,要等到牠發動攻擊時才會被發現。牠很少從上方攻擊,但牠從上方來襲時,白色的下側和海水反映出的明亮天色融為一體。

大白鯊是海洋中最兇猛的掠食者。
牠的長度可達4公尺,牠生活在熱帶海域,活動範圍從接近海面,露出那讓人膽破心驚的背鰭,到潛入海中800公尺。
牠在水中速度約為每小時3.5公里,但在追捕獵物時,可短暫爆發到高達每小時60公里。

大白鯊的獵物相當多樣,包括海龜、鮪魚、劍魚、海豚和海獅等。當牠攻擊獵物時,牠的嘴巴大開,露出那接近10公分的三角鋸緣牙齒。
接著牠咬著獵物,並用其利牙撕破獵物的皮肉,牠更會左右甩頭,試圖把附在骨頭上的肉撕下來,再大口大口吞下去。

大白鯊主要獵食:

魚類和鰭足類(例如海豹和海獅)。大白鯊有時也會攻擊人類,但大多數情況是鯊魚誤將乘衝浪板衝浪的人當做海豹而被吸引而且在確認後多半會吐掉。大多數
的攻擊也發生在低能見度的海水中。大白鯊,像其他的鯊魚一樣,在主要的牙齒後面擁有數排的牙齒,這允許任何牙齒斷裂可以被迅速的替換。

由於大白鯊主要食物,如海豹、金鎗魚等都是游泳快速及敏捷的獵物,因此大白鯊能成功捕獲的機會很低。為了有效捕捉獵物,大白鯊一般採取突擊。牠們首先會在水底埋伏,由於大白鯊的背部呈深色,海豹於水面難以察覺大白鯊存在。當大白鯊確認獵物,便從下至上向獵物攻擊。一般攻擊情況下,第一擊會令獵物重傷,這時大白鯊會停止任何攻擊,直至獵物失血過多死亡後,再以溫和的方式享用獵物。當獵物是以高速前進時,大白鯊甚至會躍出水面攻擊獵物。

大白鯊也會吃腐爛的鯨魚屍體,當一些大型鯨魚死亡擱淺,腐肉氣味通常會吸引一大群大白鯊覓食。雖然一般認為大白鯊是單獨獵食,但牠們也有階級之分,在享用鯨魚屍體時,較年長的大白鯊會率先享用。


作者: seasky    時間: 2012-7-25 04:18 PM

多謝分享精彩圖片, 又知多些.
作者: sosoce    時間: 2012-7-25 05:40 PM

攝影師終於拍到一張滿意的作品——一條大白鯊躍出水面,以每小時25英里的速度張口追吃同樣躍出水面的小海豹。大白鯊躍出水面只有不到一秒,但攝影師為了捕捉這一幕,舉着相機好幾小時,忍受暈船浪和肌肉痛,最後完成任務。「當水面回復平靜後,我還以為自己在發夢。」攝影師說。
作者: ryankwonglam    時間: 2012-7-26 10:26 AM

勁呀 咁都影到
作者: suncall    時間: 2012-7-26 01:41 PM

摄影师犀利




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