Factors determining geographical distributions and genetic population structures of alvinocaridid shrimps in the in the the Northwest Pacific

Understanding of biogeographic and genetic diversity among deep-sea chemosynthetic communities will help clarify both population dynamics and evolution of endemic species in hydrothermal vent ecosystems. Present research aimed to identify the factors determining the distribution and genetic population structure of alvinocaridid shrimps, which are dominant macrofaunal invertebrates in the Okinawa Trough, one of Northwest Pacific back-arc basins. Distribution and genetic population structure of four dominant alvinocaridid species were examined through taxonomic and molecular phylogenetic approaches. Their geographical distributions and genetic diversities were different from each other. Alvinocaris longirostris and Shinkaicaris leurokolos are patchily distributed in the Okinawa Trough. In contrast, Alvinocaris sp. and A. dissimilis is distributed in a single vent field, respectively. Alvinocaris sp. is also distributed in the Izu-Ogasawara Arc, which is 1500 km apart from the Okinawa Trough. S. leurokolos showed extremely high genetic diversity, while A. dissimilis and A. longirostris represented low genetic diversity and Alvinocaris sp. showed moderate genetic diversity. The factors determining geographical distribution and genetic population structure of alvinocaridids in the Okinawa Trough were suggested to be environmental adaptations relating to their different life history traits, which are attributable to the characteristics of the back arc system, namely, wide bathymetric range, various substrates and vent fluids, in the Northwest Pacific.

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First Name: 
Takuya
Last Name: 
Yahagi
Telephone: 
+819045502951
Affiliation: 
Atmosphere and Ocean Research Institute, The University of Tokyo
First Name: 
Hiromi
Last Name: 
Watanabe
Affiliation: 
Japan Agency for Marine-Earth Science and Technology
First Name: 
Jun-Ichiro
Last Name: 
Ishibashi
Affiliation: 
Department of Earth and Planetary Sciences, Kyusyu University
First Name: 
Shigeaki
Last Name: 
Kojima
Affiliation: 
Atmosphere and Ocean Research Institute, The University of Tokyo
Choose keywords that are most applicable to your abstract. (Three maximum.): 
Biogeography
Distribution and abundance
Early life history (reproduction, dispersal, settlement, recruitment)
Abstract ID: 
CBE5-126