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托福TPO-33 Lecture 3(下)

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Over time these sub-populations in all those different habitats...well, they developed very different physical traits.

久而久之,这些在不同栖息地的亚种……它们发展出了差异很大的生理特性。

They adapted to survive in their particular ecological niche, their...their position within a particular ecosystem.

它们适应了在自己特定的生态位生存,即它们……它们在某个特定生态系统中的位置。

We call this type of species diversification within a species adaptive radiation.

我们称这种种类物种多样化为“适应性辐射”。

南极鱼.jpg

And what adaptive radiation is is: an evolutionary process by which a parent species rapidly undergoes changes resulting in various new species in order to fill multiple ecological niches.

适应性辐射是什么呢:它是一种进化过程,母种迅速经历了许多改变,导致了新物种出现,来填补更多的生态位。

So in the case of the Notothenioids, that single species started colonizing empty habitats to such an extent that it evolved into a broad range of new species, the 90 or so Notothenioid species that we have today.

所以对南极鱼而言,那单单一种鱼开始在空旷的栖息地里殖民,达到了这样一种程度——进化出形形色色的新物种,也就是我们今天知道的90多种南极鱼。

So let me switch to adaptive radiation with regard to another species that's also been very successful.

让我(把话题)切换到另一个非常成功的物种,它也有适应性辐射。

What is the lecture mainly about?

这节课主要讲了什么?

Why does the professor mention that coral reefs support more than 4000 species of fish?

为什么教授要提及珊瑚礁养活了超过4000种鱼?

What the characteristic of Notothenioids helps them survive in sub-freezing temperatures?

南极鱼的什么特点帮助它们在低于冰点的温度里生存下来?

Why did the anti-freeze protein initially give no special advantage to the earlier's Notothenioids?

为什么抗冻蛋白最初没有给早期的南极鱼提供优势?

According to the professor, what factors led to the rapid distribution of notothenioids throughout the Southern Ocean?

根据教授所言,是什么因素造成南极鱼迅速遍布南部海域?

According to the professor, what happen to Notothenioids that migrate into different areas of the Southern Ocean?

根据教授所言,南极鱼中,迁徙到南部海域其它地方的的鱼类都经历了什么?

重点单词   查看全部解释    
survive [sə'vaiv]

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vt. 比 ... 活得长,幸免于难,艰难度过

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extent [iks'tent]

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n. 广度,宽度,长度,大小,范围,范围,程度

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range [reindʒ]

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n. 范围,行列,射程,山脉,一系列
v. 排

 
distribution [.distri'bju:ʃən]

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n. 分发,分配,散布,分布

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initially [i'niʃəli]

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adv. 最初,开头

 
switch [switʃ]

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n. 开关,转换,鞭子
v. 转换,改变,交换

 
particular [pə'tikjulə]

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adj. 特殊的,特别的,特定的,挑剔的
n.

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advantage [əd'vɑ:ntidʒ]

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n. 优势,有利条件
vt. 有利于

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evolutionary [.i:və'lu:ʃnəri]

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adj. 进化的,发展的,演变的

 
ecosystem ['ekəusistəm]

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n. 生态系统

 

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