[B-CG09] [EJ] Phanerozoic biodiversity change: Extinction and diversification

Tue. May 23, 2017 10:45 AM - 12:15 PM 201B (International Conference Hall 2F)

convener:Yukio Isozaki(Department of Earth Science and Astronomy, Multi-disciplinary Sciences - General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo), Yusuke Sawaki(The University of Tokyo), Chairperson:Yusuke Sawaki(The University of Tokyo)

Biotic evolution was the consequence of repeated extinction and following diversification in the past, which was caused by large-scale environmental changes, in particular, by extremely rapid and drastic forcing that changed the environments of the biosphere. Irreversible and episodic changes in material cycling on the planet and in galactic cosmic radiation are nominated as major driving mechanism for the alleged rapid, large-scale environmental perturbations. The biodiversity change in the fossiliferous Phanerozoic record is characterized by 5 major mass extinctions within the long-term trend of diversity increase. Nonetheless, each extinction event has been explained rather in ad hoc manner, without any universal explanation. This session discusses the Phanerozoic biodiversity change under a new light of the recent progress in geology.

+Add all to schedule

10:45 AM - 11:00 AM

[BCG09-01] High-precision U-Pb temporal constraints on the early Cambrian diversification of animal life from eastern Yunnan, China

*Kaori Tsukui¹, Yukio Isozaki², Maoyan Zhu³, Jahandar Ramezani¹, Tomohiko Sato⁴, Xingliang Zhang⁵, Samuel A. Bowring ¹ (1.Massachusetts Institute of Technology, 2.University of Tokyo, 3.Nanjing Institute of Geology and Palaeontology, 4.Tokyo Institute of Technology, 5.Northwest University)

11:00 AM - 11:15 AM

[BCG09-02] Mass extinctions related to global cooling: A case study of the late Ordovician mass extinction using a multi isotope approach

*Teruyuki Maruoka¹, Sachiko Agematsu¹, Katsuo Sashida¹, Mat Niza² (1.Faculty of Life and Environmental Sciences, University of Tsukuba, 2.Geological Survey of Malaysia)

11:15 AM - 11:30 AM

[BCG09-03] The redox history and nitrogen cycle in the pelagic Panthalassic deep ocean during the double-phased extinction interval across the Paleozoic-Mesozoic transition

*Wataru Fujisaki^1,4, Yusuke Sawaki^1,2, Shinji Yamamoto³, Yohei Matsui⁴, Manabu Nishizawa⁴, Yukio Isozaki², Shigenori Maruyama⁵ (1.Tokyo Institute of Technology, 2.The University of Tokyo, 3.Yokohama National University, 4.Japan Agency for Marine-Earth Science and Technology, 5.Earth-Life Science Institute, Tokyo Institute of Technology)

11:30 AM - 11:45 AM

[BCG09-04] Climate changes during mass extinctions by asteroid-comet impacts and large volcanic eruptions

*Kunio Kaiho¹ (1.Graduate School of Science, Tohoku University)

11:45 AM - 12:00 PM

[BCG09-05] Land ecosystem collapse followed by marine environmental stress spanning the Permian-Triassic mass extinction

*Raman Kumar Biswas¹, Kunio Kaiho¹, Ryosuke Saito¹, Zhiqiang Shi² (1.Graduate School of Science and Faculty of Science, Tohoku University, 2.Chengdu University of Technology, Chengdu, China)

12:00 PM - 12:15 PM

[BCG09-06] Neutral stochastic model of evolution and biodiversity: topological approach to phylogenetic tree

*Yuichiro Ishii¹ (1.Department of Planetology, Faculty of Science, Kobe University)

Session information