DNA barcoding reflects the diversity and variety of brooding traits of fish species in the family Syngnathidae along China’s coast

Zhang, Yanhong; Qin, Geng; Zhang, Huixian; Wang, Xin; Lin, Qiang

doi:10.1016/j.fishres.2016.09.015

Cited by 25 publications

(18 citation statements)

References 42 publications

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“…Due to the extremely short time of species differentiation, ancestral traits are randomly fixed in the differentiated species [22,38]. Similar phenomena have been found in Psorophora [12], Syngnathidae [78] and Laemolyta [58], and mixed lineage cases are particularly common in plateau fish [65]. In this sense, to find evidence of reproductive isolation, nuclear genetic and ecological data must be combined for further research [6,45,70].…”

Section: Discussionmentioning

confidence: 73%

DNA barcoding reveals cryptic diversity in the underestimated genus Triplophysa (Cypriniformes: Cobitidae, Nemacheilinae) from the northeastern Qinghai-Tibet Plateau

Wang

Zhang²,

Yang³

et al. 2020

BMC Evol Biol

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Background The northeastern part of the Qinghai-Tibet Plateau (QTP) presents a high number of plateau loach species. As one of the three major groups of fishes distributed on the QTP, plateau loach has high ecological value. However, the taxonomy and systematics of these fish are still controversial, and a large number of new species have been reported. The reason for this phenomenon is that the degree of morphological variation is low, the phylogenetic information provided by morphological and anatomical features used for species identification is relatively poor, and many cryptic species are observed. Based on the high-density sampling points from the biodiversity hotspots surveyed, this study aims to evaluate the biodiversity of plateau loach in the northeastern part of the QTP and reveal the hidden diversity by comparing morphological species with molecular operational taxonomic units (MOTUs). Results After careful identification and comparison of the morphology and DNA barcoding of 1630 specimens, 22 species were identified, with 20 considered valid local species and two identified as new species that had not been previously described. Based on the combination of morphological and molecular methods, a total of 24 native species were found, two of which were cryptic species: Triplophysa robusta sp1 and Triplophysa minxianensis sp1. Fourteen of the 24 species form clusters of barcodes that allow them to be reliably identified. The remaining cases involved 10 closely related species, including rapidly differentiated species and species that seemed to have experienced incomplete lineage sorting or showed introgressions. Conclusions The results highlight the need to combine traditional taxonomies with molecular methods to correctly identify species, especially closely related species, such as the plateau loach. This study provides a basis for protecting the biodiversity of plateau loach.

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Section: Discussionmentioning

confidence: 73%

DNA barcoding reveals cryptic diversity in the underestimated genus Triplophysa (Cypriniformes: Cobitidae, Nemacheilinae) from the northeastern Qinghai-Tibet Plateau

Wang

Zhang²,

Yang³

et al. 2020

BMC Evol Biol

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“…Syngnathids are perhaps the most unusual and specialized group of fishes considering their male reproductive mode [13]. The variation in pouch structure is one of the most important phenomena to have occurred throughout the evolutionary divergence of syngnathids [14].…”

Section: Discussionmentioning

confidence: 99%

“…The family Syngnathidae is a large and diverse clade of bony fishes, and male brood-pouch morphology was a major focus of previous evolutionary research. The brooding structures vary greatly between genera, from the simplest incubating area typical of the Nerophinae to much more complex structures, such as the sealed pouch of the Hippocampinae [13]. Previous studies hypothesized that syngnathids can be divided into five major subfamilies based on brood pouch morphology, and subsequent studies divided syngnathids into two large clades based on the position of the male brood pouch [3, 12–15].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies hypothesized that syngnathids can be divided into five major subfamilies based on brood pouch morphology, and subsequent studies divided syngnathids into two large clades based on the position of the male brood pouch [3, 12–15]. These phylogenetic divisions have been supported in molecular phylogenetic analyses based on partial mitochondrial sequences [13, 15, 16]. However, the reliability of the hypothesis has not yet been confirmed using more representative data.…”

Section: Introductionmentioning

confidence: 99%

“…Mitochondrial genomes have been widely used for diverse evolutionary studies of animals, including population genetics, phylogenetics, and species identification [13, 17–20]. The circular mitogenome of teleosts is structurally conserved and contains 13 protein-coding genes, 2 rRNA genes, 22 tRNA genes, and one displacement loop (D-loop) region [21, 22], that can provide a large amount of basic data for population genetics, phylogenetics, and adaptive evolution research [13, 23]. More than one thousand complete mitochondrial DNA sequences have been determined in teleostean fishes [24], but systematic research on mitogenome structure and molecular evolution characteristics in syngnathids is still scarce.…”

Section: Introductionmentioning

confidence: 99%

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Complete mitochondrial genomes of eight seahorses and pipefishes (Syngnathiformes: Syngnathidae): insight into the adaptive radiation of syngnathid fishes

Wang

Zhang

et al. 2019

BMC Evol Biol

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Background The evolution of male pregnancy is the most distinctive characteristic of syngnathids, and their specialized life history traits make syngnathid species excellent model species for many issues in biological evolution. However, the origin of syngnathids and the evolutionary divergence time of different syngnathid species remain poorly resolved. Comprehensive phylogenetic studies of the Syngnathidae will provide critical evidence to elucidate their origin, evolution, and dispersal patterns. Results We sequenced the mitochondrial genomes of eight syngnathid species in this study, and the estimated divergence times suggested that syngnathids diverged from other teleosts approximately 48.8 Mya during the Eocene period. Selection analysis showed that many mitochondrial genes of syngnathids exhibited significantly lower Ka/Ks values than those of other teleosts. The two most frequently used codons in syngnathid fishes were different from those in other teleosts, and a greater proportion of the mitochondrial simple sequence repeats (SSRs) were distributed in non-coding sequences in syngnathids compared with other teleosts. Conclusions Our study indicated that syngnathid fishes experienced an adaptive radiation process during the early explosion of species. Syngnathid mitochondrial OXPHOS genes appear to exhibit depressed Ka/Ks ratios compared with those of other teleosts, and this may suggest that their mitogenomes have experienced strong selective constraints to eliminate deleterious mutations. Electronic supplementary material The online version of this article (10.1186/s12862-019-1430-3) contains supplementary material, which is available to authorized users.

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Evolutionary History of Syngnathid Fishes

Lin¹

2021

Encyclopedia of Life Sciences

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The family Syngnathidae diverged from other teleosts approximately 48 Mya; they originated from Indo‐Pacific regions and then diversified and spread globally. Subsequently, a unique animal group, fishes with ‘male pregnancy’, emerged. Together with their morphological traits, syngnathid fishes established a specialised evolutionary position. Interestingly, all 300 species in this family lost their pelvic fin, which is directly correlated to the absence of the tbxt4 gene. In this family, pregnancy relies on the attached brood pouch in males, and the structure of the pouch varies dramatically within the family owing to their independent evolutionary history. Some species, such as seahorses, have a fully enclosed brood pouch with robust functions. The phylogenomics and adaptive evolution of the species in the family Syngnathidae might elucidate further mechanisms involved in their morphology and male pregnancy. Key Concepts Phylogeny and evolutionary morphology in the family Syngnathidae. Syngnathidfishes represent the endless beauty of the evolution of marine organisms. Syngnathids origin from the Indian‐Pacific and spread globally. Comparative genomics elucidate the genetic basis of the specialized morphology of syngnathids. ‘Male pregnancy’ could be implemented in syngnathids by evolving a complex brood structure and the evolution of genes.

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DNA barcoding reflects the diversity and variety of brooding traits of fish species in the family Syngnathidae along China’s coast

Cited by 25 publications

References 42 publications

DNA barcoding reveals cryptic diversity in the underestimated genus Triplophysa (Cypriniformes: Cobitidae, Nemacheilinae) from the northeastern Qinghai-Tibet Plateau

DNA barcoding reveals cryptic diversity in the underestimated genus Triplophysa (Cypriniformes: Cobitidae, Nemacheilinae) from the northeastern Qinghai-Tibet Plateau

Complete mitochondrial genomes of eight seahorses and pipefishes (Syngnathiformes: Syngnathidae): insight into the adaptive radiation of syngnathid fishes

Evolutionary History of Syngnathid Fishes

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