Large-scale DNA Barcoding of the Subfamily Culterinae (Cypriniformes: Xenocyprididae) in East Asia Unveils a Geographical Scale Effect, Taxonomic Warnings and Cryptic Diversity

Overview

Journal Mol Ecol

Specialties Environmental Health
Molecular Biology

Date 2022 May 20

PMID 35593525

Authors

Weitao Chen

Nicolas Hubert

Yuefei Li

Denggao Xiang

Xingwei Cai

Shuli Zhu

Jiping Yang

Chuanjiang Zhou

Xinhui Li

Jie Li

Affiliations

Soon will be listed here.

Abstract

Geographical scale might be expected to impact significantly the efficiency of DNA barcoding as spatially comprehensive sampling provides opportunities to uncover intricate relationships among closely related species and to detect cryptic diversity for widespread taxa. Here, we present a DNA barcoding study on a Xencyprididae subfamily (Culterinae) involving the production of 998 newly generated DNA barcodes from East Asian drainages (80 localities). Together with 513 barcodes mined from BOLD and GenBank, a reference library consisting of 1511 DNA barcodes (116 localities) for 42 species was assembled, accounting for 66% of known Culterinae species. Intraspecific genetic distances are positively correlated to geographical scale, while a negative correlation is detected between interspecific genetic distances and geographical scale. The present study demonstrates that geographical scale influences the efficiency of DNA barcoding by narrowing the width of the barcoding gap. DNA-based species delimitation analyses delimited 44 molecular operational taxonomic units (MOTUs). Rampant cryptic diversity is detected within eight species with multiple MOTUs, whereas 25 species present mismatch between morphological and molecular delimitations. A total of 18 species are lumped into nine MOTUs due to low interspecific divergence and/or mixed lineages. Several MOTU divergences are hypothesized to relate to known biogeographical barriers and geological events during the Pliocene and Pleistocene. This study provides new insights into the taxonomy and phylogeography of the subfamily Culterinae.

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