Japan Geoscience Union Meeting 2025

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[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS20] Interactions of Geosphere-Hydrosphere-Biosphere and Deep-sea Methane Environments

Sun. May 25, 2025 1:45 PM - 3:15 PM Exhibition Hall Special Setting (2) (Exhibition Hall 7&8, Makuhari Messe)

convener:Yusuke Miyajima(Geomicrobiology Research Group, Research Institute for Geo-Resources and Environment, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Miho Asada(NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY ), Robert Jenkins(School of Geosciences and Civil Engineering, College of Science and Engineering, Kanazawa University), Shinsuke Aoki(Faculty of Agriculture, Kagawa University), Chairperson:Yusuke Miyajima(Geomicrobiology Research Group, Research Institute for Geo-Resources and Environment, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Shinsuke Aoki(Faculty of Agriculture, Kagawa University)

2:30 PM - 2:45 PM

[MIS20-03] Larval dispersal and genetic connectivity of deep-sea crustaceans around surface-type methane hydrate-bearing areas

*Naoki Saito1, Mikiko Yorifuji1, Hiroki Kise1, Atsushi Suzuki1, Akira Iguchi1 (1.National Institute of Advanced Industrial Science and Technology)

Keywords: Environmental impact assessment, Ocean current, Population genetics, Sea of Japan

Many benthic marine organisms migrate between habitats by dispersing as planktonic larvae. Understanding the routes of individual migration and the sink-source relationships between habitats is fundamental to environmental management. In this study, we used larval dispersal modelling and population genetic analysis to estimate the migration between habitats of the red snow crab Chionoecetes japonicus and the Alaskan pink shrimp Pandalus eous, which are both fished species in the area surrounding the surface-type methane hydrate-bearing areas. We collected genetic samples from multiple regions in the Sea of Japan, from off Shimane to off Hokkaido, and modelled larval dispersal between sampling regions. Larval dispersal modelling suggested that red snow crabs can disperse between habitats up to 750 km apart. Southern habitats supplied many larvae to northern habitats along the Tsushima Current. These dispersal patterns were consistent with population genetic analysis. For the Alaskan pink shrimp, which has a shorter pelagic larval duration and deeper dispersal depth than the red snow crab, the dispersal distance was relatively short, and there was no dispersal between distant habitats. On the other hand, the population genetics analysis showed strong genetic connectivity between all habitats. It is possible that the Alaskan pink shrimp migrates between distant habitats through stepping-stone dispersal or adult swimming, rather than direct dispersal. This study could contribute to understanding the ecology of deep-sea crustaceans around surface-type methane hydrate-bearing areas and to planning effective environmental management.

[This study was conducted as a part of the methane hydrate research project funded by METI (the Ministry of Economy, Trade and Industry, Japan).]