科学美国人60秒 SSS 鲨鱼
时间:2019-02-03 作者:英语课 分类:2018年科学美国人10月
Sharks aren't typically thought of as vegetarians 1. Or even omnivores. But about 10 years ago, scientists documented a dainty relative of the hammerhead shark, known as a bonnethead shark, consuming copious 2 amounts of seagrass.
锤头鲨通常不被认为是素食主义者。甚至是杂食动物。但大约10年前,科学家记录了锤头鲨(又称bonnethead shark)的一种精致的近亲,它消耗了大量的海草。
"A lot of people kind of just thought they were consuming it incidentally, after going after crabs 3 and squid and other little invertebrates 4 that live in the seagrass meadows." Samantha Leigh, a PhD candidate at the University of California, Irvine. "So everyone thought they were kind of just passing it through their system and not really getting anything from it."
“很多人都认为他们只是顺便吃了它,在追赶螃蟹、乌贼和其他生活在海草草原上的无脊椎动物之后。”萨曼莎·利(Samantha Leigh)是加州大学欧文分校(University of California, Irvine)的博士生。“所以每个人都认为他们只是在通过他们的系统传递信息,并没有从中得到任何东西。”
So Leigh and her colleagues hauled five of the small sharks back to a Florida lab, and put them on a three-week diet: 90 percent seagrass, 10 percent squid. And analyzed 5 the digestibility of that diet. Turns out, the sharks actually put on pounds, and were able to digest the seagrass just as well as young green sea turtles do.
于是,利和她的同事们把5条小鲨鱼带回了佛罗里达的实验室,让它们吃上三周的食物:90%的海草,10%的乌贼。并分析了其消化率。事实证明,鲨鱼的体重实际上增加了,它们能像年轻的绿海龟那样消化海草。
"It seems like even though the bonnethead shark has what scientists would deem a carnivorous gut 6, they are definitely acting 7 like omnivores. So there's probably something going on, on probably a microbial level, that's helping 8 them break down this seagrass."The full nutrition info is in the Proceedings 9 of the Royal Society B.
“看起来,尽管锤头鲨拥有科学家认为的食肉肠道,但它们的行为确实像杂食动物。”所以可能有某种东西,在微生物水平上,帮助它们分解海草。营养信息刊登在《英国皇家学会学报B》上.
The study also gives coastal 10 ecosystem 11 managers something new to chew on: these sharks are like lawnmowers, trimming the seagrass, digesting it, and, yes, recycling it. "So they likely play more of a stabilizing 12 role in food web dynamics 13. They're not a top apex 14 predator 15. And they're probably playing a large role in nutrient 16 transport in those seagrass meadow ecosystems 17 as well." As for whether we might convince more sharks to have a side salad with dinner? "I don't know that we'll be able to do that anytime soon."
这项研究也给了海岸生态系统管理者一些新的东西去咀嚼:这些鲨鱼就像割草机,修剪海草,消化,是的,循环利用。因此,它们可能在食物网络的动态中扮演更稳定的角色。它们不是顶级掠食者。它们也可能在海草草甸生态系统的营养运输中扮演着重要的角色。至于我们是否可以说服更多的鲨鱼在晚餐时吃副沙拉呢?“我不知道我们很快就能做到。”
- Vegetarians are no longer dismissed as cranks. 素食者不再被视为有怪癖的人。
- Vegetarians believe that eating meat is bad karma. 素食者认为吃肉食是造恶业。
- She supports her theory with copious evidences.她以大量的例证来充实自己的理论。
- Every star is a copious source of neutrinos.每颗恒星都是丰富的中微子源。
- As we walked along the seashore we saw lots of tiny crabs. 我们在海岸上散步时看到很多小蟹。 来自《简明英汉词典》
- The fish and crabs scavenge for decaying tissue. 鱼和蟹搜寻腐烂的组织为食。 来自《简明英汉词典》
- Insects and worms are all invertebrates. 昆虫和蠕虫都是无脊椎动物。 来自辞典例句
- In the earthworm and many other invertebrates, these excretory structures are called nephridia. 在蚯蚓和许多其它无脊椎动物中,这些排泄结构称为肾管。 来自辞典例句
- The doctors analyzed the blood sample for anemia. 医生们分析了贫血的血样。 来自《简明英汉词典》
- The young man did not analyze the process of his captivation and enrapturement, for love to him was a mystery and could not be analyzed. 这年轻人没有分析自己蛊惑著迷的过程,因为对他来说,爱是个不可分析的迷。 来自《简明英汉词典》
- It is not always necessary to gut the fish prior to freezing.冷冻鱼之前并不总是需要先把内脏掏空。
- My immediate gut feeling was to refuse.我本能的直接反应是拒绝。
- Ignore her,she's just acting.别理她,她只是假装的。
- During the seventies,her acting career was in eclipse.在七十年代,她的表演生涯黯然失色。
- The poor children regularly pony up for a second helping of my hamburger. 那些可怜的孩子们总是要求我把我的汉堡包再给他们一份。
- By doing this, they may at times be helping to restore competition. 这样一来, 他在某些时候,有助于竞争的加强。
- He was released on bail pending committal proceedings. 他交保获释正在候审。
- to initiate legal proceedings against sb 对某人提起诉讼
- 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。
- This destroyed the ecosystem of the island.这样破坏了岛上的生态系统。
- We all have an interest in maintaining the integrity of the ecosystem.维持生态系统的完整是我们共同的利益。
- The disulfide bridges might then be viewed primarily as stabilizing components. 二硫桥可以被看作是初级的稳定因素。 来自辞典例句
- These stabilizing design changes are usually not desirable for steady-state operation. 这些增加稳定性的设计改变通常不太符合稳态工作的要求。 来自辞典例句
- In order to succeed,you must master complicated knowledge of dynamics.要取得胜利,你必须掌握很复杂的动力学知识。
- Dynamics is a discipline that cannot be mastered without extensive practice.动力学是一门不做大量习题就不能掌握的学科。
- He reached the apex of power in the early 1930s.他在三十年代初达到了权力的顶峰。
- His election to the presidency was the apex of his career.当选总统是他一生事业的顶峰。
- The final part of this chapter was devoted to a brief summary of predator species.本章最后部分简要总结了食肉动物。
- Komodo dragon is the largest living lizard and a fearsome predator.科摩多龙是目前存在的最大蜥蜴,它是一种令人恐惧的捕食性动物。
- Magnesium is the nutrient element in plant growth.镁是植物生长的营养要素。
- The roots transmit moisture and nutrient to the trunk and branches.根将水分和养料输送到干和枝。
- 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