[Selection of isotopic baselines in marine ecosystems]

Area of Science:

• Marine Ecology
• Stable Isotope Analysis
• Food Web Dynamics

Background:

• Stable isotope analysis is a key tool in marine food web research.
• Accurate isotopic baselines are vital for determining organism diet and trophic levels.
• Variations in baselines can affect ecological interpretations.

Purpose of the Study:

• To provide an overview of isotopic baseline selection methods.
• To discuss challenges and solutions for baseline selection in different marine ecosystems.
• To identify future research directions in marine stable isotope ecology.

Main Methods:

• Literature review and synthesis of existing research on isotopic baselines.
• Analysis of factors influencing baseline selection in four marine ecosystems (estuary/bay, neritic, oceanic, deep sea).
• Evaluation of compound-specific stable isotopes for mitigating temporal-spatial variations.

Main Results:

• Established guidelines for selecting appropriate isotopic baselines across various marine environments.
• Identified key interferential factors affecting baseline selection accuracy.
• Highlighted the utility of compound-specific stable isotopes in addressing baseline variability.

Conclusions:

• Appropriate isotopic baseline selection is fundamental for reliable marine food web studies.
• Compound-specific stable isotope analysis offers a robust method to overcome baseline temporal-spatial variations.
• Further research is needed to refine methodologies and expand applications in marine stable isotope ecology.