Analysis tool for swimming marine microorganisms using acoustic tweezer

Area of Science:

• Marine Biology
• Phycology
• Acoustic Physics

Background:

• Phytoplankton are crucial primary producers in marine ecosystems.
• Rapid phytoplankton growth causes harmful algal blooms (HABs), posing ecological and economic threats.
• Understanding phytoplankton dynamics, like diel vertical migration (DVM), is key for HAB management.

Purpose of the Study:

• To introduce and evaluate single-beam acoustic tweezer (SBAT) for studying phytoplankton behavior.
• To demonstrate SBAT's capability in tracking HAB-forming species, Cochlodinium polykrikoides.
• To explore SBAT as a novel tool for HAB research.

Main Methods:

• Utilized a single concave bulk ultrasonic transducer to create a focused acoustic beam.
• Employed SBAT for non-invasive confinement and tracking of individual Cochlodinium polykrikoides cells.
• Compared SBAT's precision with traditional methods like ADCP and acoustic backscatter.

Main Results:

• SBAT successfully confined and tracked the swimming behavior of C. polykrikoides.
• The technique provided high-resolution data on phytoplankton motility.
• SBAT demonstrated superior precision and non-invasive manipulation compared to conventional methods.

Conclusions:

• SBAT is a versatile and effective tool for studying phytoplankton behavior and interactions.
• This novel acoustic method offers significant potential for advancing HAB research and monitoring.
• SBAT paves the way for improved strategies in managing harmful algal blooms.