Genetic differentiation and distribution routes of the bronze featherback Notopterus notopterus (Osteoglossiformes: Notopteridae) in Indochina

Abstract

Mitochondrial DNA analysis was used to investigate genetic variation in the bronze featherback fish Notopterus notopterus in Indochina. Five hundred and five fish samples collected from 11 localities were separated into three genetically differentiated intraspecific groups. Chao Phraya River samples formed a distinct group. Mekong River samples were clearly separated into two different groups, namely, middle and lower Mekong groups. The lower Mekong group was closely related to Malay Peninsula group, even though the two groups are separated by a tract of ocean. F-values (0.82-0.95) also confirmed genetic differentiation of the middle and lower Mekong groups. Although the two Mekong groups inhabit the same river basin, molecular clock calculations indicate they separated approximately 1.2 Mya, suggesting (1) evolutionary divergence before invasion of the Mekong River; (2) differences in migration routes to the river; and/or (3) differences in the timings of invasion. The complexities of historical events cannot be ignored in determinations of factors responsible for the exceptional biodiversity in the Mekong basin.

Genetic divergence in natural populations of bronze featherback, Notopterus notopterus (Osteoglossiformes: Notopteridae) from five Indian rivers, analyzed through mtDNA ATPase6/8 regions

“…The adult bronze featherbacks have poor swimming abilities and inhabit sluggish water in wetlands and floodplains which may or may not be fed with rivers ( Rainboth, 1996 ) and lay eggs in small clumps on submerged vegetation ( Talwar and Jhingran, 1991 ) and thus are not easily dispersed. Takagi ( Takagi et al, 2006a, 2006b, 2010 ) also observed high genetic differentiation between the populations of N . notopterus from Mekong basin.…”

“…The ATPase8 and ATPase6 regions of mitochondrial DNA have been successfully analyzed for both phylogeny as well as phylogeography in many fish species ( Chow and Ushiama, 2004; Dammannagoda et al, 2008; Vergara-Chen et al, 2009; Xin-Hong et al, 2004; Yan et al, 2009 ). However, the information on polymorphic molecular markers and their applications is limited to a small part of vast distribution ( Takagi et al, 2006a,b, 2010 ) and genetic relatedness with another notopterid fish, Chitala chitala ( Lal et al, 2006 ). The present study characterized complete sequences of mitochondrial ATPase8 and ATPase6 regions in N .…”

Priority knowledge needs for management of migratory fish species in Cambodia

“…These studies have also used genetic techniques to define appropriate scales for managing wild stocks and have provided important insights to connectivity, movement and life history (Adamson et al, 2009; Biesack et al, 2020; Hurwood et al, 2008; So, van Houdt, & Volckaert, 2006; So et al, 2005). Such studies have revealed signals of historical barriers to gene flow (Takagi et al, 2010), inter‐specific differences in dispersal capabilities (Takagi et al, 2011) and temporal‐based population structure that suggests multiple spawning migrations within a species (So et al, 2005).…”

A Strategy for Fisheries Resources Management in Southeast Asia: A Case Study of an Inland Fishery around Tonle Sap Lake in Cambodia

“…The genetic population structures of Thynnichtys thynnoides, bronze featherback Notopterus notopterus and climbing perch, Anabas testudineus had been examined in the lower Mekong River Basin including several sites around Tonle Sap Lake (Ishikawa et al 2005b;Takagi et al 2010Takagi et al , 2011. Although no genetic differences among sites were detected in T. thynnoides and the bronze featherback, genetic homogeneity among Stung Treng, Lao PDR, Siem Reap and Kampong Chhnang were discovered in the climbing perch (Fig.…”