海洋酸度增长威胁到海螺生存
文章来源:未知 文章作者:enread 发布时间:2011-05-26 07:31 字体: [ ]  进入论坛
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Increasing levels of ocean acidity1 could spell doom2 for British Columbia's already beleaguered3(围困的) northern abalone(鲍鱼) , according to the first study to provide direct experimental evidence that changing sea water chemistry is negatively affecting an endangered species. The northern abalone--prized as a gourmet4(美食家) delicacy--has a range that extents along the North American west coast from Baja California to Alaska. Even though British Columbia's northern abalone commercial fisheries where closed in 1990 to protect dwindling5 populations, the species has continued to struggle, largely due to poaching.

To better understand the impact climate change — and specifically, increasing ocean acidity — has on this endangered species, UBC researchers exposed northern abalone larvae6 to water containing increased levels of CO2. Increases from 400 to 1,800 parts per million killed 40 per cent of larvae, decreased the size of larvae that did survive, and increased the rate of shell abnormalities.

"This is quite bad news, not only in terms of the endangered populations of abalone in the wild, but also the impact it might have on the prospects7 for aquaculture(水产业) and coastal8 economics," says Christopher Harley, Associate Professor with the Department of Zoology9 and one of the authors of the study.

"And because the species is already thought to be limited by reproductive output and recruitment, these effects are likely to scale up to the population level, creating greater limits on population growth."

Average CO2 levels in the open ocean hover10 at 380 parts per million, a number which is excepted to increase slowly over the next century.

What concerns the researchers are the much higher spikes11 in dissolved CO2 that are already being observed along the BC coast, particularly in late spring and early summer when northern abalone populations are spawning12.

The findings were published in the latest issue of the Journal of Experimental Marine13 Biology and Ecology.

"While we're looking at a single species that is culturally important as a source of food and artistic14 inspiration for many coastal Pacific Northwest First Nations, this information may have implications for other abalone species in other parts of the world," says Ryan Crim, lead author on the paper who conducted the research while a graduate student with the UBC Department of Zoology.

Other species of abalone are farmed around the world, principally in China, Taiwan, Japan and Korea. The black, white and pink abalone are also endangered on the west coast--red abalone are still an economically viable15(可行的) food species.

The study was funded by the Natural Sciences and Engineering Research Council of Canada and conducted in collaboration16 with the Bamfield-Huu-ay-aht Community Abalone Project, a small abalone hatchery in Bamfield which has subsequently gone out of business. The dual17 mission of the hatchery was to produce cultured abalone for high end restaurants, and to restore endangered abalone by culturing and releasing larvae and juveniles18 to the wild.

Harley and Crim will continue to work with the aquaculture industry to study the effects of acidification on oysters19(牡蛎) and other shellfish.



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1 acidity rJyya     
n.酸度,酸性
参考例句:
  • This plant prefers alkaline soil,though it will readily tolerate some acidity.这种植物在酸性土壤中也能生存,但硷性土壤更加适宜。
  • Gastric acidity would not prevent the organism from passing into the gut.胃的酸度不能防止细菌进入肠道。
2 doom gsexJ     
n.厄运,劫数;v.注定,命定
参考例句:
  • The report on our economic situation is full of doom and gloom.这份关于我们经济状况的报告充满了令人绝望和沮丧的调子。
  • The dictator met his doom after ten years of rule.独裁者统治了十年终于完蛋了。
3 beleaguered 91206cc7aa6944d764745938d913fa79     
adj.受到围困[围攻]的;包围的v.围攻( beleaguer的过去式和过去分词);困扰;骚扰
参考例句:
  • The beleaguered party leader was forced to resign. 那位饱受指责的政党领导人被迫辞职。
  • We are beleaguered by problems. 我们被许多困难所困扰。 来自《简明英汉词典》
4 gourmet 8eqzb     
n.食物品尝家;adj.出于美食家之手的
参考例句:
  • What does a gourmet writer do? 美食评论家做什么?
  • A gourmet like him always eats in expensive restaurants.像他这样的美食家总是到豪华的餐馆用餐。
5 dwindling f139f57690cdca2d2214f172b39dc0b9     
adj.逐渐减少的v.逐渐变少或变小( dwindle的现在分词 )
参考例句:
  • The number of wild animals on the earth is dwindling. 地球上野生动物的数量正日渐减少。 来自《简明英汉词典》
  • He is struggling to come to terms with his dwindling authority. 他正努力适应自己权力被削弱这一局面。 来自辞典例句
6 larvae w2CxP     
n.幼虫
参考例句:
  • Larvae are parasitic on sheep.幼虫寄生在绵羊的身上。
  • The larvae prey upon small aphids.这种幼虫以小蚜虫为食。
7 prospects fkVzpY     
n.希望,前途(恒为复数)
参考例句:
  • There is a mood of pessimism in the company about future job prospects. 公司中有一种对工作前景悲观的情绪。
  • They are less sanguine about the company's long-term prospects. 他们对公司的远景不那么乐观。
8 coastal WWiyh     
adj.海岸的,沿海的,沿岸的
参考例句:
  • The ocean waves are slowly eating away the coastal rocks.大海的波浪慢慢地侵蚀着岸边的岩石。
  • This country will fortify the coastal areas.该国将加强沿海地区的防御。
9 zoology efJwZ     
n.动物学,生态
参考例句:
  • I would like to brush up my zoology.我想重新温习一下动物学。
  • The library didn't stock zoology textbooks.这家图书馆没有动物学教科书。
10 hover FQSzM     
vi.翱翔,盘旋;徘徊;彷徨,犹豫
参考例句:
  • You don't hover round the table.你不要围着桌子走来走去。
  • A plane is hover on our house.有一架飞机在我们的房子上盘旋。
11 spikes jhXzrc     
n.穗( spike的名词复数 );跑鞋;(防滑)鞋钉;尖状物v.加烈酒于( spike的第三人称单数 );偷偷地给某人的饮料加入(更多)酒精( 或药物);把尖状物钉入;打乱某人的计划
参考例句:
  • a row of iron spikes on a wall 墙头的一排尖铁
  • There is a row of spikes on top of the prison wall to prevent the prisoners escaping. 监狱墙头装有一排尖钉,以防犯人逃跑。 来自《简明英汉词典》
12 spawning e223115a66b2213a16c438abb9a400cb     
产卵
参考例句:
  • Encounter sites have a small chance of spawning a "Commander" NPC. 遭遇战地区有很小的几率遇到NPC指挥官。
  • Instantly revives your Champion at your Spawning Pool, 9 minute cooldown. 立即在出生地复活你的英雄,冷却时间9分钟。
13 marine 77Izo     
adj.海的;海生的;航海的;海事的;n.水兵
参考例句:
  • Marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
  • When the war broke out,he volunteered for the Marine Corps.战争爆发时,他自愿参加了海军陆战队。
14 artistic IeWyG     
adj.艺术(家)的,美术(家)的;善于艺术创作的
参考例句:
  • The picture on this screen is a good artistic work.这屏风上的画是件很好的艺术品。
  • These artistic handicrafts are very popular with foreign friends.外国朋友很喜欢这些美术工艺品。
15 viable mi2wZ     
adj.可行的,切实可行的,能活下去的
参考例句:
  • The scheme is economically viable.这个计划从经济效益来看是可行的。
  • The economy of the country is not viable.这个国家经济是难以维持的。
16 collaboration bW7yD     
n.合作,协作;勾结
参考例句:
  • The two companies are working in close collaboration each other.这两家公司密切合作。
  • He was shot for collaboration with the enemy.他因通敌而被枪毙了。
17 dual QrAxe     
adj.双的;二重的,二元的
参考例句:
  • The people's Republic of China does not recognize dual nationality for any Chinese national.中华人民共和国不承认中国公民具有双重国籍。
  • He has dual role as composer and conductor.他兼作曲家及指挥的双重身分。
18 juveniles 257c9101f917ec8748aa5fc520c6a9e3     
n.青少年( juvenile的名词复数 );扮演少年角色的演员;未成年人
参考例句:
  • Do you think that punishment for violent crimes should be the same for juveniles and adults? 你对暴力犯罪的惩罚对于青少年和成人应一样吗? 来自生活英语口语25天快训
  • Juveniles Should we not exactly in need of such strength and conviction? 少年的我们难道不正是需要这种力量和信念吗? 来自互联网
19 oysters 713202a391facaf27aab568d95bdc68f     
牡蛎( oyster的名词复数 )
参考例句:
  • We don't have oysters tonight, but the crayfish are very good. 我们今晚没有牡蛎供应。但小龙虾是非常好。
  • She carried a piping hot grill of oysters and bacon. 她端出一盘滚烫的烤牡蛎和咸肉。
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