alexa Killer Typhoons Began to Impact the Japanese Islands from ca.1.55 Ma, Based on Phylogeography of Chlorogomphus (Gliding Dragonfly) | OMICS International | Abstract
ISSN: 2157-7617

Journal of Earth Science & Climatic Change
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Research Article

Killer Typhoons Began to Impact the Japanese Islands from ca.1.55 Ma, Based on Phylogeography of Chlorogomphus (Gliding Dragonfly)

Osozawa S1* and Wakabayashi J2
1Department of Earth Sciences, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
2Department of Earth and Environmental Sciences, California State University, Fresno, CA 93740, USA
Corresponding Author : Osozawa S
Department of Earth Sciences
Graduate School of Science
Tohoku University
Sendai 980-8578, Japan
Tel: +8-22-795- 6619
E-mail: [email protected]
Received April 12, 2015; Accepted May 08, 2015; Published May 18, 2015
Citation: Osozawa S, Wakabayashi J (2015) Killer Typhoons Began to Impact the Japanese Islands from ca.1.55 Ma, Based on Phylogeography of Chlorogomphus (Gliding Dragonfly). J Earth Sci Climat Change S3:003. doi: 10.4172/2157-7617.S3-003
Copyright: ©2015 Osozawa S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Chlorogomphus is a golden ring dragonfly, and characterized by swarming behavior, and strong gliding and flying. Therefore this dragonfly is expected to be easily carried by typhoon winds. This dragonfly immigrated and colonized the Pacific coast of southern Japan main islands from the Ryukyu islands. In this study, we demonstrate that the Japan mainland population is phylogenetically common to the northern Ryukyu population, but distinct from the southern Ryukyu and Taiwan populations. The East China Sea was formed between the Ryukyu island arc and Asian mainland by the rifting of the Okinawa trough that started at 1.55 Ma. Prior to this time typhoons lost strength when heading overland over the Ryukyu continental arc and continental China, but since then have maintained their strength northward because they were over water (the newly opened Okinawa trough). Chlorogomphus is interpreted to have speciated on each island, but it also migrated northward as a result of typhoons that carried it further than it could normally fly. The present paper shows that such typhoons that now ravage Japan may have been generated since 1.55 Ma and will continue to be dangerous, because the opening of the Okinawa trough is an ongoing process. This phenomenon is unrelated to global warming.

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