New perspectives in diet analysis based on DNA barcoding and parallel pyrosequencing: the trnL approach

Area of Science:

• Ecology
• Molecular Biology
• Genetics

Background:

• Diet analysis traditionally relies on morphological identification, which can be challenging with degraded samples.
• DNA barcoding offers a molecular approach for species identification using standardized DNA sequences.
• Advancements in DNA sequencing techniques facilitate new possibilities in diet analysis.

Purpose of the Study:

• To develop and validate a DNA-based method for accurate diet analysis in various species.
• To assess the efficacy of amplifying short DNA fragments from degraded samples, such as feces.
• To explore the application of this method for large-scale ecological studies.

Main Methods:

• Utilizing DNA barcoding with universal primers to amplify short, informative DNA fragments (e.g., from the chloroplast trnL (UAA) intron).
• Analyzing DNA fragments recovered from fecal samples to identify consumed plant taxa.
• Applying the trnL approach for species identification, aiming for high accuracy.

Main Results:

• The trnL approach successfully identified approximately 50% of plant taxa to the species level.
• The method proved to be fast, simple to implement, and robust across various sample types.
• The DNA barcoding technique was effective for diet analysis in mammals, birds, insects, and molluscs.

Conclusions:

• This DNA barcoding method provides a powerful tool for large-scale diet analyses in ecological research.
• It enhances the study of resource partitioning and the description of food webs within ecosystems.
• The approach offers new perspectives for understanding feeding ecology across diverse taxa.