Quantifying dispersal from hydrothermal vent fields in the western Pacific Ocean

Area of Science:

• Marine Biology
• Oceanography
• Deep-Sea Ecology

Background:

• Hydrothermal vent fields are primarily located along spreading centers in submarine basins behind convergent plate boundaries in the western Pacific.
• Ocean circulation significantly influences larval dispersal, impacting gene flow, diversity, and distribution of vent fauna.

Purpose of the Study:

• To quantify potential larval dispersal of deep-sea vent species using ocean circulation in the western Pacific.
• To identify connectivity patterns and barriers for vent populations across different ocean basins.

Main Methods:

• Integration of a biophysical model with deep-profiling float experiments.
• Analysis of ocean currents to predict larval dispersal pathways and frequencies.

Main Results:

• Vent fields within back-arc basins show good connectivity, while basin-to-basin dispersal is infrequent (tens to hundreds of thousands of years).
• The South Equatorial Current may connect the extensive southwest Pacific vent complex (>4,000 km) for species with long larval development.
• The Kuroshio Current can potentially link vent fields in the Okinawa Trough and Izu-Bonin Arc (1,200 km apart), depending on dispersal depth.

Conclusions:

• Understanding larval dispersal is crucial for estimating gene flow among hydrothermal vent populations.
• Findings aid in designing effective marine conservation strategies for deep-sea vent ecosystems.
• Ocean currents play a critical role in structuring deep-sea biodiversity and connectivity.