Mitogenomic Insights of notopterids (Actinopterygii: Osteoglossomorpha) from Sundaland biodiversity hotspot: Transcontinental diversification and colonization before Last Glacial Maximum DOI

Flandrianto Sih Palimirmoa,

Angkasa Putra,

Arif Wibowo

et al.

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: May 6, 2025

Abstract Notopterid freshwater fishes are distributed across Africa and Asia, but their genomic diversity evolutionary history, particularly within the Sundaland biodiversity hotspot, remain poorly understood. This study provides a novel mitochondrial genome of Chitala borneensis six additional mitogenomes lopis Notopterus notopterus, obtained from type localities three major Sundaic Islands. A comprehensive investigation involving structural analysis, comparative genomics, phylogenetic reconstruction was conducted to elucidate diversity, relationships, divergence patterns. All species displayed typical teleost mitogenomic architecture, with C. possessing largest (16,943 bp). The exhibited an AT bias, most protein-coding genes initiating translation ATG start codon showing evidence strong purifying selection. analyses using Bayesian Maximum-likelihood methods illustrated two clades notopterids separating Asian African lineages during Mesozoic era. However, Chitala Notopterus diverged Cenozoic, processes continuing into Miocene. notable high mean genetic (8.84%) among suggested long-term isolation, while deep intraspecific variation in N. notopterus (4.32%) indicated presence possible cryptic Sundaland. These findings support hypothesis transcontinental diversification this Old-World underscore historical biogeographic significance South Southeast Asia. Specifically, region likely facilitated gene flow common ancestors extant valid via interconnected palaeodrainage systems prior Last Glacial Maximum, connectivity subsequently disrupted by post-glacial sea-level rise.

Language: Английский

Mitogenomic Insights of notopterids (Actinopterygii: Osteoglossomorpha) from Sundaland biodiversity hotspot: Transcontinental diversification and colonization before Last Glacial Maximum DOI

Flandrianto Sih Palimirmoa,

Angkasa Putra,

Arif Wibowo

et al.

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: May 6, 2025

Abstract Notopterid freshwater fishes are distributed across Africa and Asia, but their genomic diversity evolutionary history, particularly within the Sundaland biodiversity hotspot, remain poorly understood. This study provides a novel mitochondrial genome of Chitala borneensis six additional mitogenomes lopis Notopterus notopterus, obtained from type localities three major Sundaic Islands. A comprehensive investigation involving structural analysis, comparative genomics, phylogenetic reconstruction was conducted to elucidate diversity, relationships, divergence patterns. All species displayed typical teleost mitogenomic architecture, with C. possessing largest (16,943 bp). The exhibited an AT bias, most protein-coding genes initiating translation ATG start codon showing evidence strong purifying selection. analyses using Bayesian Maximum-likelihood methods illustrated two clades notopterids separating Asian African lineages during Mesozoic era. However, Chitala Notopterus diverged Cenozoic, processes continuing into Miocene. notable high mean genetic (8.84%) among suggested long-term isolation, while deep intraspecific variation in N. notopterus (4.32%) indicated presence possible cryptic Sundaland. These findings support hypothesis transcontinental diversification this Old-World underscore historical biogeographic significance South Southeast Asia. Specifically, region likely facilitated gene flow common ancestors extant valid via interconnected palaeodrainage systems prior Last Glacial Maximum, connectivity subsequently disrupted by post-glacial sea-level rise.

Language: Английский

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