Solid phase extraction and metabolic profiling of exudates from living copepods

Area of Science:

• Marine Biology
• Chemical Ecology
• Analytical Chemistry

Background:

• Copepods release bioactive compounds influencing aquatic ecosystems.
• The chemical exometabolome of copepods is largely uncharacterized.
• Understanding these chemical signals is crucial for pelagic habitat dynamics.

Purpose of the Study:

• To develop a method for extracting and analyzing exuded metabolites from live copepods.
• To identify chemical compounds indicative of copepod presence in pelagic environments.
• To investigate potential pheromones and defensive compounds in copepod exudates.

Main Methods:

• Development of a closed-loop solid-phase extraction system for live copepods.
• High-resolution liquid chromatography-mass spectrometry (LC-MS) for metabolite analysis.
• Chemometric analysis to identify specific chemical patterns.

Main Results:

• Identified 87 compounds forming a specific chemical signature for copepod presence.
• Discovered nine compounds predominantly found in female exudates, suggesting potential pheromones.
• Detected copepodamide G, a known phytoplankton defense inducer, in both male and female extracts.

Conclusions:

• The developed method effectively captures and analyzes chemical signals from live copepods.
• This approach enhances understanding of chemical interactions within pelagic ecosystems.
• The findings provide a foundation for further research into copepod chemical ecology.