The miniaturization of organisms during the Permian-Triassic mass extinction,as an ecological strategy in response to environmental devastation,has been widely recognized in diverse marine invertebrates.Previous studi...The miniaturization of organisms during the Permian-Triassic mass extinction,as an ecological strategy in response to environmental devastation,has been widely recognized in diverse marine invertebrates.Previous studies on the extinction process and miniaturization of foraminifers in the Permian-Triassic interval have relied on the fossil record of the low-latitude Paleotethys or a global database,although data and materials from the high-latitude Neotethys region are still rare.To reveal the evolutionary patterns and spatial variability of foraminifers at different latitudes and paleogeographic contexts,here we investigated the fossil distribution and size variation of foraminifers in the Selong Section of southern Tibet,located in the mid-latitude Neotethys of the Southern Hemisphere during the Permian-Triassic transition.The results show that the foraminifer of the Selong Section experienced a two-pulsed extinction(total species extinction rate of 71%),consistent with the time in South China but with a lower magnitude of extinction.Meanwhile,the data show that foraminiferal test volume was significantly miniaturized following the first pulse of extinction event:the mean size of post-extinction foraminifer was only 15%of that in the pre-extinction,mainly reflected by the disappearance of large forms as well as occurrences of smaller survivors and originators.Combined with the South China record,size data from southern Tibet indicate that the miniaturization of foraminifera is synchronous in the Paleotethys and Neotethys but smaller in magnitude in the Neotethys.We propose that ocean anoxia and acidification may be the environmental pressures leading to local and global foraminiferal miniaturizations,along with global warming,which might play a dominant role.展开更多
Gulliver in Lilliput一课教学,基于“任务单教学”,分为四个环节:创设情境,引出主题任务,为教学目标的达成提供学习氛围与动力;自主学习,完成初步探究,通过自主略读与精读,了解语篇大意,建构语言知识;研讨互学,展示讨论成果,学生相互交...Gulliver in Lilliput一课教学,基于“任务单教学”,分为四个环节:创设情境,引出主题任务,为教学目标的达成提供学习氛围与动力;自主学习,完成初步探究,通过自主略读与精读,了解语篇大意,建构语言知识;研讨互学,展示讨论成果,学生相互交流,互相倾听,训练思维能力;反馈练习,内化语言运用,进一步加深学生对语篇中各个人物动作和心理的理解。展开更多
Gulliver's Travels is one of the masterpieces of Irish writer Jonathan Swift, which is well received by children and adults worldwide.Children may read it like a fairy tale, and are fascinated by the little people...Gulliver's Travels is one of the masterpieces of Irish writer Jonathan Swift, which is well received by children and adults worldwide.Children may read it like a fairy tale, and are fascinated by the little people, the giants, and the strange people in the story; while adults may read itlike a satirical works, and find the real world in miniature in it. The book was adapted into a movie recently, although there were some differences, itis also interesting. What I am going to discuss is mainly about the movie of the same name Gulliver's Travels.展开更多
基金supported by the State Key R&D Project of China(No.2023YFF0804000)the National Natural Science Foundation of China(Nos.92155201,92255303)a BQR of the Universit'e de Bourgogne。
文摘The miniaturization of organisms during the Permian-Triassic mass extinction,as an ecological strategy in response to environmental devastation,has been widely recognized in diverse marine invertebrates.Previous studies on the extinction process and miniaturization of foraminifers in the Permian-Triassic interval have relied on the fossil record of the low-latitude Paleotethys or a global database,although data and materials from the high-latitude Neotethys region are still rare.To reveal the evolutionary patterns and spatial variability of foraminifers at different latitudes and paleogeographic contexts,here we investigated the fossil distribution and size variation of foraminifers in the Selong Section of southern Tibet,located in the mid-latitude Neotethys of the Southern Hemisphere during the Permian-Triassic transition.The results show that the foraminifer of the Selong Section experienced a two-pulsed extinction(total species extinction rate of 71%),consistent with the time in South China but with a lower magnitude of extinction.Meanwhile,the data show that foraminiferal test volume was significantly miniaturized following the first pulse of extinction event:the mean size of post-extinction foraminifer was only 15%of that in the pre-extinction,mainly reflected by the disappearance of large forms as well as occurrences of smaller survivors and originators.Combined with the South China record,size data from southern Tibet indicate that the miniaturization of foraminifera is synchronous in the Paleotethys and Neotethys but smaller in magnitude in the Neotethys.We propose that ocean anoxia and acidification may be the environmental pressures leading to local and global foraminiferal miniaturizations,along with global warming,which might play a dominant role.
文摘Gulliver in Lilliput一课教学,基于“任务单教学”,分为四个环节:创设情境,引出主题任务,为教学目标的达成提供学习氛围与动力;自主学习,完成初步探究,通过自主略读与精读,了解语篇大意,建构语言知识;研讨互学,展示讨论成果,学生相互交流,互相倾听,训练思维能力;反馈练习,内化语言运用,进一步加深学生对语篇中各个人物动作和心理的理解。
文摘Gulliver's Travels is one of the masterpieces of Irish writer Jonathan Swift, which is well received by children and adults worldwide.Children may read it like a fairy tale, and are fascinated by the little people, the giants, and the strange people in the story; while adults may read itlike a satirical works, and find the real world in miniature in it. The book was adapted into a movie recently, although there were some differences, itis also interesting. What I am going to discuss is mainly about the movie of the same name Gulliver's Travels.
