Perspective on biodiversity and connectivity of deep-sea hydrothermal vent animals in the Okinawa Trough, Japan

Deep-sea hydrothermal vent fields are inhabited by obligate faunas with high biomass, although the environments are patchily and ephemeral nature. It must be difficult to figure out the conditions of whole populations consisting with several subpopulations in a single biogeographical region, due to inaccessibility. Biodiveristy is one of the powerful tools to know connectivity among distant populations and environmental preference of faunas. For recent years, partial DNA sequence data on mitochondrial COI gene has been accumulated, as well as species diversity of vent faunas. We summarized genetic data for 9 species as well as faunal species diversity in several hydrothermal vent fields in the Okinawa Trough, a sedimented backarc basin in northwestern Pacific Ocean. The ranges of genetic diversity was different among species, and roughly divided in the two types; 1) high genetic diversity with several subpopulations, and 2) homogeneous metapopulation with middle or low genetic diversity. These trends seemed to be associated with habitats or taxonomy of the species. The connectivity among populations was sometimes segregated in species with high genetic diversity, probably due to current conditions. On the other hand, biodiversity of vent fauna showed north-south gradient and it seemed to associate with geological background of the Okinawa Trough, the older vent fields located in the deeper area in the southern parts of Okinawa Trough. The present summary of diversity and connectivity information will help our understanding on larval dispersal and establishment of vent fauna in the Okinawa Trough.

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First Name: 
Hiromi
Last Name: 
Watanabe
Telephone: 
+81-46-867-9523
Affiliation: 
Japan Agency for Marine-Earth Science and Technology
First Name: 
Masako
Last Name: 
Nakamura
Affiliation: 
Okinawa Institute of Science and Technology
First Name: 
Tomomi
Last Name: 
Ogura
Affiliation: 
Japan Agency for Marine-Earth Science and Technology
First Name: 
MiHye
Last Name: 
Seo
Affiliation: 
Atmosphere and Ocean Research Institute, the University of Tokyo
First Name: 
Takuya
Last Name: 
Yahagi
Affiliation: 
Atmosphere and Ocean Research Institute, the University of Tokyo
First Name: 
Satoshi
Last Name: 
Mitarai
Affiliation: 
Okinawa Institute of Science and Technology
Choose keywords that are most applicable to your abstract. (Three maximum.): 
Biogeography
Distribution and abundance
Ecological Interactions
Abstract ID: 
CBE5-162