www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

English 中文網(wǎng) 漫畫網(wǎng) 愛新聞iNews 翻譯論壇
中國網(wǎng)站品牌欄目(頻道)
當(dāng)前位置: Language Tips > Normal Speed News VOA常速

Studies: how whales, fish might adapt to warming ocean

[ 2011-08-08 13:09]     字號 [] [] []  
免費(fèi)訂閱30天China Daily雙語新聞手機(jī)報:移動用戶編輯短信CD至106580009009

Studies: how whales, fish might adapt to warming ocean

Two new science studies provide a glimpse of how some popular sea creatures could adapt to a changing climate.

One study describes how gray whales successfully adapted to previous cycles of global warming and cooling. The second predicts a fish shift on the west coast of North America. It suggests West Coast fishermen will need to adapt to different prey if the Pacific Ocean warms as projected over the next 50 years.

Nick Pyenson claims he has the best job in the world. This paleobiologist curates the marine fossil collection at the Smithsonian's Natural History Museum in Washington, DC. The famous collection includes lots of creatures driven to extinction by environmental changes. It also includes some of the long fossil record for gray whales, a species that still lives in the Pacific Ocean today.

"And grey whales fit into this question about ongoing climate change," Pyenson and his former doctoral advisor from UC Berkeley wondered how gray whales survived through previous cycles of global warming and cooling.

"So, in the past two million years, the Northern Hemisphere has undergone dramatic changes with ice sheets going all the way down to Chicago and Seattle, and in doing so, that sucks up a lot of the water that would be otherwise be put in the ocean and drops sea level dramatically."

Pyenson says historic sea level changes periodically expanded and closed off vast feeding grounds. He theorizes gray whales hung on through bad times by migrating less, or switching food sources or both. Even today, there are small numbers of gray whales that stay in one place and eat fish and krill, while most of their species migrate long distances and bottom feed.

"What we think is telling is that those who don't migrate are telling us about the range in behavior and what these animals can do ecologically."

Pyenson says that adaptability bodes well for how the whales may respond to future climate changes. He adds one caveat though, saying the current cycle of human-induced global warming is developing faster and more powerfully than the historic episodes he examined. The study was published to the online journal, Closed One.

Studies: how whales, fish might adapt to warming ocean

Fish shift

Separately, a group of Canadian and American researchers examined how a warming ocean could affect fish common along the West Coast of North America.

The science team studied 28 fish species whose biology and distribution is well understood. Oceanographer Ric Brodeur of the NOAA Northwest Fisheries Science Center in Newport, Oregon, says the list includes salmon, smelt, sharks, pollock and sardines. Brodeur says the researchers simulated what could happen if the North Pacific heats up due to global warming.

"Because these fish are so mobile, they can move up and down the coast or inshore or offshore to find the preferred temperature that they want."

The federal science agency, NOAA, predicts the ocean's surface waters off Oregon and Washington state will warm about two degrees Celsius over the next 50 years. Brodeur says that's enough to cause significant moves. A forthcoming research paper models how much. If you combine the home ranges of all the fish that the team studied, there's an average shift northward of roughly 25 miles per decade. Over time, Brodeur predicts fishermen and seafood consumers will notice.

"what the species that we can consider is very important - like hake - things that are commercially fished here might be gone and replaced by other species that may or may not be commercially important."

Across Yaquina Bay from Brodeur's office, charter fishing boats unload sun-burned anglers. Veteran captain Robert Waddell says he's already seen some evidence of warm water species shifting northward.

"I've noticed in the last probably 12-13 years, we've been starting to see some marlin off and on out there and we've hooked them a few times." says Waddell.

Blue fin tuna is another possible newcomer that could fill the vacancy if, say, salmon left for cooler waters off Canada. But Waddell is optimistic the local fishing fleet can adapt.

"People will make adjustments, some 50 years from now, we might be the marlin capital of the world. You never know."

The study of the northerward fish shift should appear in science journal in about six months.

species: a specific kind of something 物種

caveat: a warning against certain acts 警告

human-induced: 由人類行為所導(dǎo)致的

oceanographer: a scientist who studies physical and biological aspects of the seas 海洋學(xué)家

forthcoming: of the relatively near future 即將到來的

marlin: large long-jawed oceanic sport fishes 槍魚

blue fin tuna: an important warm-water fatty fish of the genus thunnus of the family Scombridae 藍(lán)鰭金槍魚

Related stories:

Visiting the Galapagos and the unusual creatures that live there

Mangrove forests among the most carbon-rich forests in the world

Ten-year study of the world’s oceans makes thousands of discoveries

Arctic ice melting faster than predicted

(來源:VOA 編輯:實(shí)習(xí)生史莉萍)

 
中國日報網(wǎng)英語點(diǎn)津版權(quán)說明:凡注明來源為“中國日報網(wǎng)英語點(diǎn)津:XXX(署名)”的原創(chuàng)作品,除與中國日報網(wǎng)簽署英語點(diǎn)津內(nèi)容授權(quán)協(xié)議的網(wǎng)站外,其他任何網(wǎng)站或單位未經(jīng)允許不得非法盜鏈、轉(zhuǎn)載和使用,違者必究。如需使用,請與010-84883631聯(lián)系;凡本網(wǎng)注明“來源:XXX(非英語點(diǎn)津)”的作品,均轉(zhuǎn)載自其它媒體,目的在于傳播更多信息,其他媒體如需轉(zhuǎn)載,請與稿件來源方聯(lián)系,如產(chǎn)生任何問題與本網(wǎng)無關(guān);本網(wǎng)所發(fā)布的歌曲、電影片段,版權(quán)歸原作者所有,僅供學(xué)習(xí)與研究,如果侵權(quán),請?zhí)峁┌鏅?quán)證明,以便盡快刪除。
 

關(guān)注和訂閱

人氣排行

翻譯服務(wù)

中國日報網(wǎng)翻譯工作室

我們提供:媒體、文化、財(cái)經(jīng)法律等專業(yè)領(lǐng)域的中英互譯服務(wù)
電話:010-84883468
郵件:translate@chinadaily.com.cn
 
 
主站蜘蛛池模板: 在线91精品国产免费 | 国产免费自拍 | 精品一区国产 | 97国产在线视频 | 日本乱人伦片中文三区 | 亚洲欧美一区二区三区在线观看 | 99视频在线永久免费观看 | 美女黄页网站免费进入 | 成年人在线视频 | 久在线播放 | 在线观看国产一级强片 | 日韩一级影片 | 亚洲免费精品视频 | 成年女人午夜免费视频 | 精品国产v无码大片在线观看 | 欧美精品黄页免费高清在线 | 真实偷清晰对白在线视频 | 日本一级~片免费永久 | 亚洲成人xxx | 日韩成人免费在线 | 国产91精品一区二区视色 | 看久久久久毛片婷婷色 | 呦女精品视频 | 美女又黄又免费的视频 | 又刺激又黄的一级毛片 | 亚洲精品综合欧美一区二区三区 | 老司机免费福利午夜入口ae58 | 国产资源精品一区二区免费 | 国产精品大全国产精品 | 国产精品黄在线观看免费 | 国产不卡在线播放 | 女人张开双腿让男人桶爽免 | 国产激情一区二区三区在线观看 | 18在线网站 | 亚洲欧美日韩国产精品 | 国产成人免费网站在线观看 | 国产精品国产三级国产an | 成人毛片国产a | 欧美午夜精品久久久久久黑人 | 日本黄网站高清色大全 | 18videosex性欧美69超高清 |