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科学美国人60秒 SSS 鳕鱼可以应对受控的气候变化

时间:2019-12-10 07:18:59

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This is Scientific American — 60-Second Science. I'm Annie Sneed.

Polar bears and coral reefs are obvious victims of climate change. But a warming world will also challenge many other animals. For example, cod1. The fish play a critical role in marine2 ecosystems3 and human economies. Climate change could devastate4 Atlantic and polar cod.

A team of scientists wanted to find out how rising sea temperatures and ocean acidification might affect these fish populations.

"We w?ent out with our research vessel5 into the Barents Sea, and caught Atlantic cod and polar cod, and brought them back alive into a research facility in Northern Norway." Flemming Dahlke, a marine biologist at the Alfred Wegener Institute in Germany.

"And in this facility, we raised the eggs and larvae6 under different temperature and ocean acidification, mimicking7 the conditions expected for the next decades to come."

The researchers placed the eggs and larvae in various carbon dioxide concentrations, as well as three different temperature scenarios9: one, the "b??usiness as usual" scenario8, where humans continue to emit greenhouse gases as current rates and ocean waters increase 3 to 4 degrees Celsius10. They also tested an intermediate scenario of a 2-degree Celsius rise, and a "best-case" scenario, where water temperatures rise only 1 degree. They then recorded egg survival rates and larval development.

"The results were pretty clear. We found that with ocean acidification, the eggs become more sensitive to temperature extremes. So this means that their thermal11 tolerance12 range narrows. And that we found for both species. And we also found that they use more energy to regulate against the stress of temperature and ocean acidification."

The study is in the journal Science Advances.

"And when we used these data and combined them with the climate projections13, we find that with the worst-case scenario there will be a decrease in egg survival chances of about 50 percent in many of the important spawning15 areas of those species."

Although these populations might be able to adapt by shifting their spawning grounds northward16.

"The question is if the species will find also suitable feeding conditions in those alternative spawning areas. So it could be that the temperature is right, but they won't find enough food up in the north."

Big changes in cod populations will likely have ripple17 effects: cod are food for many other animals, like birds and seals. And countries like Norway depend on the income that cod fisheries haul in. But the new research also offers a bit of good news.

"On the positive side, we find that in the scenario where we successfully limit global warming to 1.5 degrees, both species would be able to successfully reproduce in those areas where they spawn14 currently."

Thanks for listening for Scientific American — 60-Second Science. I'm Annie Sneed.


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1 cod nwizOF     
n.鳕鱼;v.愚弄;哄骗
参考例句:
  • They salt down cod for winter use.他们腌鳕鱼留着冬天吃。
  • Cod are found in the North Atlantic and the North Sea.北大西洋和北海有鳕鱼。
2 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。
3 ecosystems 94cb0e40a815bea1157ac8aab9a5380d     
n.生态系统( ecosystem的名词复数 )
参考例句:
  • There are highly sensitive and delicately balanced ecosystems in the forest. 森林里有高度敏感、灵敏平衡的各种生态系统。 来自《简明英汉词典》
  • Madagascar's ecosystems range from rainforest to semi-desert. 马达加斯加生态系统类型多样,从雨林到半荒漠等不一而足。 来自辞典例句
4 devastate PZRzy     
v.使荒芜,破坏,压倒
参考例句:
  • A few days before,a fire had devastated large parts of Windsor Castle.几天前,温莎城堡的大部分被一场大火烧毁。
  • Earthquakes can also cause tsunamis,which devastate coastal regions.地震还引发海啸,它直接破坏海岸地区。
5 vessel 4L1zi     
n.船舶;容器,器皿;管,导管,血管
参考例句:
  • The vessel is fully loaded with cargo for Shanghai.这艘船满载货物驶往上海。
  • You should put the water into a vessel.你应该把水装入容器中。
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 mimicking ac830827d20b6bf079d24a8a6d4a02ed     
v.(尤指为了逗乐而)模仿( mimic的现在分词 );酷似
参考例句:
  • She's always mimicking the teachers. 她总喜欢模仿老师的言谈举止。
  • The boy made us all laugh by mimicking the teacher's voice. 这男孩模仿老师的声音,逗得我们大家都笑了。 来自辞典例句
8 scenario lZoxm     
n.剧本,脚本;概要
参考例句:
  • But the birth scenario is not completely accurate.然而分娩脚本并非完全准确的。
  • This is a totally different scenario.这是完全不同的剧本。
9 scenarios f7c7eeee199dc0ef47fe322cc223be88     
n.[意]情节;剧本;事态;脚本
参考例句:
  • Further, graphite cores may be safer than non-graphite cores under some accident scenarios. 再者,根据一些事故解说,石墨堆芯可比非石墨堆芯更安全一些。 来自英汉非文学 - 环境法 - 环境法
  • Again, scenarios should make it clear which modes are acceptable to users in various contexts. 同样,我们可以运用场景剧本来搞清楚在不同情境下哪些模式可被用户接受。 来自About Face 3交互设计精髓
10 Celsius AXRzl     
adj.摄氏温度计的,摄氏的
参考例句:
  • The temperature tonight will fall to seven degrees Celsius.今晚气温将下降到七摄氏度。
  • The maximum temperature in July may be 36 degrees Celsius.七月份最高温度可能达到36摄氏度。
11 thermal 8Guyc     
adj.热的,由热造成的;保暖的
参考例句:
  • They will build another thermal power station.他们要另外建一座热能发电站。
  • Volcanic activity has created thermal springs and boiling mud pools.火山活动产生了温泉和沸腾的泥浆池。
12 tolerance Lnswz     
n.宽容;容忍,忍受;耐药力;公差
参考例句:
  • Tolerance is one of his strengths.宽容是他的一个优点。
  • Human beings have limited tolerance of noise.人类对噪音的忍耐力有限。
13 projections 7275a1e8ba6325ecfc03ebb61a4b9192     
预测( projection的名词复数 ); 投影; 投掷; 突起物
参考例句:
  • Their sales projections are a total thumbsuck. 他们的销售量预测纯属估计。
  • The council has revised its projections of funding requirements upwards. 地方议会调高了对资金需求的预测。
14 spawn qFUzL     
n.卵,产物,后代,结果;vt.产卵,种菌丝于,产生,造成;vi.产卵,大量生产
参考例句:
  • The fish were madly pushing their way upstream to spawn.鱼群为产卵而疯狂地向上游挤进。
  • These fish will lay spawn in about one month from now.这些鱼大约一个月内会产卵。
15 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。
16 northward YHexe     
adv.向北;n.北方的地区
参考例句:
  • He pointed his boat northward.他将船驶向北方。
  • I would have a chance to head northward quickly.我就很快有机会去北方了。
17 ripple isLyh     
n.涟波,涟漪,波纹,粗钢梳;vt.使...起涟漪,使起波纹; vi.呈波浪状,起伏前进
参考例句:
  • The pebble made a ripple on the surface of the lake.石子在湖面上激起一个涟漪。
  • The small ripple split upon the beach.小小的涟漪卷来,碎在沙滩上。

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