DNA barcoding of shared fish species from the North Atlantic and Australasia: minimal divergence for most taxa, but Zeus faber and Lepidopus caudatus each probably constitute two species

Aquatic Biology

Robert D. Ward¹  Filipe O. Costa Bronwyn H. Holmes Dirk Steinke¹ 

关键词: Mitochondrial DNA;    Cytochrome c oxidase;    COI;    CoxI;    Identification;    Zeus faber;    Lepidopus caudatus;    Cryptic species;   

DOI  :  10.3354/ab00068

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: Fifteen fish species, totalling 149 specimens, were cytochrome c oxidase I sequenced—barcoded—from Northern (Atlantic and Mediterranean) and Southern (Australasian) Hemisphere waters. Thirteen species showed no significant evidence of spatial genetic differentiation for this gene, although small sample sizes reduced statistical power. For marine fish, barcodes collected in one part of a species range are likely to be useful as identifiers in all other parts of its range. Two species did show striking north–south differentiation, with F_ST values of 0.84 and 0.96 (both p << 0.001). One of these, the silver scabbardfish Lepidopus caudatus, showed 2.75% genetic distance between northern and southern clades. The other, John dory Zeus faber, showed 7.44% differentiation between northern and southern clades. All specimens of these 2 species fell correctly into the northern or southern clade. We suggest that both taxa conceal a currently unrecognised, cryptic species, and recommend further taxonomic and genetic investigation.

【 授权许可】

Unknown