Population genetic structure and comparative diversity of smallmouth bass Micropterus dolomieu: congruent patterns from two genomes

Abstract

Genetic diversity and divergence patterns of smallmouth bass Micropterus dolomieu spawning groups are analysed across its northern native range with mtDNA cytochrome b gene sequences and eight unlinked nuclear DNA microsatellite loci. Results reveal high levels of genetic variability and significant differences in allelic representation among populations (mtDNA: mean ± s.e., H = 0·50 ± 0·06, mean ± s.e., θ = 0·41 ± 0·02 and microsatellites: mean ± s.e. H = 0·46 ± 0·03, mean ± s.e. θ = 0·25 ± 0·01). The distributions of 28 variant mtDNA haplotypes, which differ by an average of 3·94 nucleotides (range = 1-8), denote divergent representation among geographic areas. Microsatellite data support nine primary population groups, whose high self-assignment probabilities likewise display marked divergence. Genetic patterns demonstrate: (1) high genetic diversity in both genomes, (2) significant divergence among populations, probably resulting from natal site homing and low lifetime migration, (3) support for three post-glacial refugia that variously contributed to the current northern populations, which remain evident today despite waterway connectivity and (4) a weak yet significant genetic isolation by geographic distance pattern, indicating that other processes affect the differences among populations, such as territoriality and site fidelity.

Genetic signatures of polymorphic microsatellite loci in the Ambiguous silver pomfret, Pampus argenteus (Teleostei, Stromateidae)

“…Moreover, the selection of loci with high PIC for the analysis can also lead to high genetic diversity. Microsatellite markers have demonstrated to be highly sensitive for detecting the population structure of fish (Cheng et al 2015;Stepien et al 2017;. In this study, analyses based on seven microsatellite loci revealed low levels of genetic differentiation for P. argenteus.…”

“…Microsatellites (simple sequence repeats, SSRs) are tandemly repeated motifs of 1-6 bases characterized by a high degree of length polymorphism (Zane et al 2002), and they are sensitive indicators of population genetic structure (Cheng et al 2015;Song et al 2016;Stepien et al 2017). In previous studies, we evaluated the phylogeographical structure of P. argenteus by mitochondrial DNA markers, and two lineages were obtained (Li et al 2017b).…”

Genetic variability and population structure of Capoeta gracilis (Keyserling 1861) populations in the southern basin rivers of the Caspian Sea as revealed by the mtDNA sequences

“…Understanding the population genetic structure of natural populations of wildlife species provides essential information for the development of conservation and management strategies (Nakagawa et al, 2016;Stepien et al, 2017). The survival of a species or population depends on its ability to adapt to environmental changes by its genetic variation and thus genetic variation is essential for long-term survival and evolution (Bataillon et al, 1996).…”

Genetic signatures of polymorphic microsatellite loci in the Ambiguous silver pomfret, Pampus argenteus (Teleostei, Stromateidae)

“…Microsatellite markers have demonstrated to be highly sensitive for detecting the population structure of fish (Cheng et al 2015; Stepien et al 2017; Li et al 2018). In this study, analyses based on seven microsatellite loci revealed low levels of genetic differentiation for P.argenteus .…”

“…Microsatellites (simple sequence repeats, SSRs) are tandemly repeated motifs of 1–6 bases characterized by a high degree of length polymorphism (Zane et al 2002), and they are sensitive indicators of population genetic structure (Cheng et al 2015; Song et al 2016; Stepien et al 2017). In previous studies, we evaluated the phylogeographical structure of P.argenteus by mitochondrial DNA markers, and two lineages were obtained (Li et al 2017b).…”