Neotropical bats: estimating species diversity with DNA barcodes

Area of Science:

• Molecular Ecology
• Biodiversity Assessment
• Zoology

Background:

• DNA barcoding, particularly using the cytochrome c oxidase subunit 1 (COI) gene, is a standard for animal species identification and richness estimation.
• Large-scale DNA barcoding studies, especially in diverse tropical regions, are infrequent despite the technique's proven efficiency.

Purpose of the Study:

• To assess current and potential species diversity in Neotropical bats (order Chiroptera) using DNA barcoding.
• To evaluate the utility of DNA barcoding across extensive geographic areas and varied habitats within the Neotropics.

Main Methods:

• Analysis of DNA barcodes from the COI gene of over 9000 individuals representing 163 Neotropical bat species.
• Examination of haplotype variation to assess species identification accuracy and intraspecific diversity.
• Identification of distinct intraspecific lineages potentially indicating cryptic species.

Main Results:

• 98.8% of the 163 bat species exhibited unique COI haplotypes, enabling straightforward species identification.
• High intraspecific diversity was observed (mean 1.38%), comparable to other bat groups.
• 44 distinct intraspecific lineages were detected, suggesting potential cryptic species requiring further investigation.

Conclusions:

• DNA barcoding is a highly effective tool for species identification and biodiversity assessment in Neotropical bats, even over large geographic scales.
• The study supports the continued development of DNA barcoding libraries and highlights the need for further taxonomic research, including complementary molecular and morphological analyses, to confirm cryptic species.