《科学美国人 60秒科学》(Scientific Americans 60-second science)[自制lrc字幕][重新更新][压缩包]

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lass='quotetop'>引用
Sometimes scientific discoveries are hidden in museum specimen drawers and old journal articles. In two studies in the journal Science, researchers who went through the stuff in institutional attics offer new insights into the development and diversity of filter-feeding whales—and the fish that first occupied that ecological niche.It had been thought that mammoth, filter-feeding fish—which swam through the water with a gaping, open mouth, collecting tiny marine creatures—only lived fleetingly before whales took their place in the food chain.But a research team [led by Matt Friedman, University of Oxford] decided to take a closer look at museum fossils of bony, pre-historic fish that had either been misclassified or ignored. They also reexamined previous studies.The investigators now say that these fish filter-feeders lived from about 170 to 65 million years ago, a healthy stretch in which to pioneer and perfect the niche. [See http://bit.ly/9MVd4Y]In a related study, scientists [Felix Marx, University of Otago, New Zealand and Mark Uhen, George Mason University] show that when filter-feeding whales took over from bony fish, their diversity was linked to the diversity of their dinner—the tiny creatures at the very bottom of the food chain –tiny algae known as diatoms. [See http://bit.ly/cekTKZ]New insights into some of the largest—and smallest—creatures on the planet.—Cynthia Graber
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lass='quotetop'>引用
[00:00.00]Podcaster: Cynthia Graber
[00:07.00]Sometimes scientific discoveries are hidden in museum specimen drawers and old journal articles.
[00:12.00]In two studies in the journal Science, researchers who went through the stuff in institutional attics
[00:17.00]offer new insights into the development and diversity of filter-feeding whales—
[00:20.00]and the fish that first occupied that ecological niche.[00:23.00]It had been thought that mammoth, filter-feeding fish—
[00:26.00]which swam through the water with a gaping, open mouth, collecting tiny marine creatures—
[00:30.00]only lived fleetingly before whales took their place in the food chain.[00:33.00]But a research team (led by Matt Friedman, University of Oxford)
[00:34.00]decided to take a closer look at museum fossils of bony, pre-historic fish
[00:38.00]that had either been misclassified or ignored. They also reexamined previous studies.
[00:42.00]The investigators now say that these fish filter-feeders lived from about 170 to 65 million years ago,
[00:48.00]a healthy stretch in which to pioneer and perfect the niche. (See http://bit.ly/9MVd4Y)[00:52.00]In a related study, scientists
[00:52.60](Felix Marx, University of Otago, New Zealand and Mark Uhen, George Mason University)
[00:53.00]show that when filter-feeding whales took over from bony fish,
[00:56.00]their diversity was linked to the diversity of their dinner—
[00:59.00]the tiny creatures at the very bottom of the food chain
[01:02.00] –tiny algae known as diatoms. (See http://bit.ly/cekTKZ)[01:03.50]New insights into some of the largest—and smallest—creatures on the planet.LRC文件
lass='quotetop'>引用
有时科学新发现就藏身在博物馆的标本抽屉和就期刊里。在科学杂志的两项研究中,科学家在回顾旧历的时候找到了须鲸分类和进化的新灵感,和最早充当该职位的鱼类。科学界一直认为,这种依靠口部的裂隙来滤食微生物的巨大鱼类仅仅短暂的存在就被鲸鱼所取代。但一个研究团队决定仔细查看博物馆中的史前多骨鱼类化石并发现这些化石不是被错误的归类就是被忽略了。他们也重新检验了以往的研究。调查者说这些滤食性鱼类生活在距今1亿7千万年至6千万年间,是非常适合于食物链的这个位置的。在一个相关研究中,科学家表示当须鲸取代多骨鱼时,它们的多样性与它们的食物 -- 一种食物链底层的称作Diatom的藻类 -- 的多样性是相关的。这就是对于地球上最大动物和最小动物的新理解。如有错误,欢迎大家批评指正!institutional attics: 这个不会翻译,估计应该是类似于象牙塔类的比喻吧 简单译文
补充:这两天看了一下walking with the dinosaurs sea monsters与恐龙同行,海中巨兽的第三集,刚好看到了貌似这种鱼的生物,就在这集中第二危险的海域,可以看到一种20 ~ 30长的巨大甲骨鱼,马文还一起和它们同游,不过周围都是鲨鱼、海中鳄鱼什么的。

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[科学美国人.60秒科学].sa_d_podcast_091125.mp3 1.2MB
[科学美国人.60秒科学].sa_d_podcast_091125.lrc 1.7KB
自09 11 25开始
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