Molecular Estimate of Decapod Origins from Hydrothermal Vents in the West Pacific and Indian Oceans

Hydrothermal vents are appealing due to the association of the extreme and seemingly toxic nature of these environments and their highly productive biological communities. Decapod crustaceans are one of the dominant groups on most hydrothermal vents, showing an extraordinary diversity compared with other vent lineages. However, little is known about their evolutionary origin and dispersal events leading to their current distribution. In this study, we investigated the origin and diversification of vent decapods within the context of the evolution of tectonic plates. To this end, the complete mitochondrial genomes of seven decapod species from hydrothermal vents in the Western Pacific and Indian Ocean were sequenced. Divergence times were inferred from phylogenomic analyses. The results indicate that both of vent-endemic bythograeid crabs and alvinocarid shrimps emerged during the late Mesozoic and early Cenozoic. This estimate advances the origin of bresiliid shrimps by ~50 Mya as compared to previous calculations. It is also the first estimate of the origin of bythograeid crabs. Although of limited sampling, our estimates support the extinction/repopulation hypothesis which postulates recent diversification times for most hydrothermal vent species due to their mass extinction by global deep-water anoxic/dysoxic events during the Late Cretaceous and Early Tertiary. The continental-derived property of the West Pacific province is compatible with the possibility that vent decapods diversified from ancestors from shallow-water regions such as cold seeps. Our results move us a step closer towards understanding the evolutionary origin of hydrothermal vent species and their distribution in the Western Pacific–Indian Ocean Region.

Your format preference:: 
Oral Presentation
Would you be interested in publishing this conference paper in a special issue of Marine Ecology?: 
No
First Name: 
Jin-Shu
Last Name: 
Yang
Telephone: 
+86-571-8820-6155
Affiliation: 
Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education and College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, PR China
First Name: 
Yan-Qin
Last Name: 
Yu
Affiliation: 
Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education and College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, PR China
First Name: 
Hiromichi
Last Name: 
Nagasawa
Affiliation: 
Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113-8657, Japan
First Name: 
Shinji
Last Name: 
Tsuchida
Affiliation: 
Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan
First Name: 
Yoshihiro
Last Name: 
Fujiwara
Affiliation: 
Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan
First Name: 
Wei-Jun
Last Name: 
Yang
Affiliation: 
Key Laboratory of Conservation Biology for Endangered Wildlife of the Ministry of Education and College of Life Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, PR China
Choose keywords that are most applicable to your abstract. (Three maximum.): 
Biogeography
Evolutionary history (fossil and molecular data)
Abstract ID: 
CBE5-118