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A Concoction Pipeline for Generating Molecular Operational Taxonomic Units (MOTUs) Among Riparian and Aquatic Beetles

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DNA BARCODING: Barcoding corals: limited by interspecific divergence, not intraspecific variation.

T L Shearer¹, M A Coffroth

¹School of Biology, Georgia Institute of Technology, 310 Ferst Dr., Atlanta, GA 30332-0230, USA, State University of New York at Buffalo, 109 Cooke Hall, Buffalo, NY 14260, USA.

Molecular Ecology Resources

|May 19, 2011

Summary

DNA barcoding using the COI gene is not suitable for identifying scleractinian corals. Low genetic divergence between species prevents establishing reliable thresholds for species identification.

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Area of Science:

Marine Biology
Genetics
Biodiversity Assessment

Background:

DNA barcoding is a valuable tool for species identification and biodiversity assessment across various life stages.
Morphological identification methods for scleractinian corals can be limited by phenotypic plasticity.
The suitability of standard DNA barcoding, specifically the cytochrome c oxidase subunit 1 (COI) gene, for scleractinian coral identification remains uncertain.

Purpose of the Study:

To investigate the levels of intra- and interspecific genetic variation in the COI gene of scleractinian corals.
To determine if threshold values can be established to differentiate between conspecifics and other taxa within scleractinian corals.
To assess the efficacy of the standard COI DNA barcoding system for scleractinian species identification.

Main Methods:

Analysis of intra- and interspecific genetic variation within the COI gene of scleractinian corals.
Comparison of genetic divergence levels to identify potential threshold values for species discrimination.
Evaluation of overlap between intraspecific variation and interspecific divergence.

Main Results:

Significant overlap was observed between intraspecific variation and interspecific divergence in the COI gene of scleractinian corals.
Low genetic divergence among many scleractinian species, with some cases showing 0% divergence, hindered threshold establishment.
The standard COI DNA barcoding system proved inadequate for reliably discerning most scleractinian species due to insufficient genetic resolution.

Conclusions:

The standard COI DNA barcoding gene is not a suitable marker for the species identification of scleractinian corals.
The inherent low genetic divergence among scleractinian species prevents the establishment of effective DNA barcoding thresholds.
Alternative genetic markers or approaches may be necessary for accurate biodiversity assessments of scleractinian coral populations.