Japan Geoscience Union Meeting 2015

Presentation information


Symbol B (Biogeosciences) » B-PT Paleontology

[B-PT24] Evolution of Chemosynthetic Ecosystem in Earth History

Sun. May 24, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

Convener:*Robert Jenkins(School of Natural System, College of Science and Engineering, Kanazawa University), Hiromi WATANABE(Japan Agency for Marine-Earth Science and Technology), Takami Nobuhara(Science Education (Geology), Faculty of Education, Shizuoka University), Ryuichi Majima(Faculty of Education and Human Sciences, Yokohama National University)

6:15 PM - 7:30 PM

[BPT24-P04] Current status and problems of studies on ancient fossil chemosynthetic communities

*Robert JENKINS1 (1.Kanazawa University)

Keywords:chemosynthesis-based ecosystem, evolution, fossil assembladge, Mesozoic, Cenozoic, Extreme environment

Nearly 40 years has been past from the first finding of novel ecosystem (chemosynthetic ecosystem) from deep-sea hydrothermal vent along Galapagos Rift. Since the discovery, the chemosynthetic ecosystems have been found not only from vents but also around cold-seeps, whale falls and sunken drifted woods. The ancient chemosynthetic communities have also been recognized and dozens of researches have been reported from various ages and areas. Up to now, we have roughly known temporal changes of chemosynthetic communities. Many interesting hypotheses for the evolution of chemosynthetic communities have been proposed from both paleontological and modern biological sides. However, many problems and/or conflictions have been recognized. For examples, recognition of ancient chemosynthetic communities especially depended on whale carcasses and sunken wood, confliction between molecular divergent ages and fossil record, and incomplete records of temporal and spatial distribution of fossil record. This presentation will summarize current status of studies on chemosynthetic communities, and propose some scopes to understand better evolutionary history of chemosynthetic communities.