您现在的位置: 首页 > 英语听力 > 媒体资讯 > 60秒科学 > 正文

60秒科学:蝾螈为藻类提供生存空间和食物

时间:2011-04-08 14:12:20 来源:scientificamerican 编辑:sunny  每天三分钟英语轻松学

蝾螈和藻类共生,自然果然奇妙!

A rolling stone gathers no moss. But a salamander embryo can attract algae. Inside its tissues and cells. This intimate co-habitation—the first ever seen between algae and a vertebrate—is revealed in the Proceedings of the National Academy of Sciences. [Ryan Kerney et al., "Intracellular invasion of green algae in a salamander host"]

Spotted salamanders lay their eggs in pools in spring. And the egg capsules actually look green, thanks to the algae that surrounds the resident embryos. That relationship benefits both parties. Algae feed on the nitrogen-rich waste products generated by the embryos. And the embryos bask in the oxygen given off by the algae. Take away their algae, and spotted salamander babies hatch smaller and less mature.

So that’s the eggs. But this study is the first to show that the algae actually inhabit the embryo itself. Using imaging techniques and DNA testing, scientists found algae inside the cells of young salamander embryos—and even in the reproductive tracts of some adult females.

Which suggests that some algae may be handed down directly from parent to child. More evidence that many individuals are really entire little ecosystems.

—Karen Hopkin

收藏

相关热词搜索: 60秒科学

上一篇:影视模仿:《生活大爆炸》片段模仿

下一篇:新概念第一册第81课:烤牛肉和土豆

您可能还感兴趣的文章

60秒科学:老年人行路安全要避免喝酒
听力练习研究表明,老年人喝酒后会影响行路时避开障碍物的灵活性。 Subjects with an average age of 62 had trouble avoiding an obstacle placed on a treadmill after

时间:2010-09-29 编辑:keke

60秒科学:宇宙中的星星比想象的多得多
听力练习The discovery that elliptical galaxies have many more red dwarf stars than the Milky Way means that the universe might have three times as many total

时间:2010-12-03 编辑:sunny

60秒科学:Gene Therapy Cures Color-Blind Monke
Gene Therapy Cures Color-Blind MonkeysIn a study in the journal Nature, researchers report that they have used gene therapy to cure a form of color-blindess in

时间:2009-09-17 编辑:echo

60秒科学:Why Dwarf Galaxies Lack Star Power
Why Dwarf Galaxies Lack Star PowerIn a study in the journal Nature, researchers show that the relative lack of star density in dwarf galaxies need not conflict

时间:2010-01-18 编辑:echo

最新文章

无觅相关文章插件,快速提升流量