Two new species of Pseudogobio pike gudgeon (Cypriniformes: Cyprinidae: Gobioninae) from Japan, and redescription of P. esocinus (Temminck and Schlegel 1846)

Tominaga, Koji; Kawase, Seigo

doi:10.1007/s10228-019-00693-x

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…Bayesian clustering analysis based on microsatellite loci data showed very weak genetic population structuring in P. esocinus in Lake Biwa, although some degree of population structuring was detected in the whole Lake Biwa system. All the local samples in Lake Biwa and rivers (except R9 from a cryptic species [31,32]) shared two different genetic elements in various proportions (Fig 7).Their average proportion was similar among the local samples from Lake Biwa (about 0.7:0.3), whereas it was rather variable among the river samples. The pairwise-Fst indicated that no pairs between lake samples showed significant differentiation under Holm's correction (S4 Table).…”

Section: Gene Flow and Population Subdivisionmentioning

confidence: 96%

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Morphological variation associated with trophic niche expansion within a lake population of a benthic fish

Endo

Watanabe

2020

PLoS ONE

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Ecological theory suggests that generalist species should have traits with multiple adaptive peaks. Consequently, in heterogeneous environments such adaptive landscapes may lead to phenotypic divergence that becomes fixed in populations via reproductive isolation, thus driving speciation. However, contrary to this expectation, the process of ecological diversification in wild populations is not always associated with obvious trait divergence and reproductive isolation due to some ecological and geographic constrains. To examine the ecological conditions that promote (or inhibit) divergence is quite important to improve our understanding of the underlying mechanisms. Here we examine how the patterns of trait variation (divergence/non-divergence) are determined in relation to ecological niche expansion and gene flow using a benthic fish, Pseudogobio esocinus, in the Lake Biwa system, Japan. The fish exhibited various patterns of morphological variation in mouth parts among populations. Lake fish tended to have a smaller mouth compared with river fish and also showed remarkable individual variations within some local samples. Lake fish utilized chironomid larvae as the primary prey, as in riverine fish. But, fish with smaller and narrower mouths utilized significantly higher proportions of amphipods (a novel prey unique to the lake) as their secondary prey. Microsatellite analysis detected no genetic structuring in the Lake Biwa catchment, suggesting no reproductive separation among eco-morphologically divergent individuals. Our results exemplify population niche expansion associated with continuous eco-morphological variation without divergence, and provide insights into the role of non-discrete diversification for thriving in heterogeneous environments.

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Section: Gene Flow and Population Subdivisionmentioning

confidence: 96%

“…Pseudogobio esocinus in western Japan includes two largely differentiated mitochondrial DNA groups (Group A and Group B) [31], corresponding to two cryptic species [32]. All samples from the lake (L1-L9) and rivers (R1-R8) were of Group A, except a part from R9 that possessed the Group B mtDNA.…”

Section: Molecular Analysismentioning

confidence: 99%

Morphological variation associated with trophic niche expansion within a lake population of a benthic fish

Endo

Watanabe

2020

PLoS ONE

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“…Pseudogobio fishes (Cypriniformes: Gobionidae) are a group of freshwater small-sized fishes (<15 cm), and they are distributed in East Asia (Tominaga and Kawase 2019 ; Fu 2020 ). The genus Pseudogobio has been revised in a recent study (Fu 2020 ), and they are comprised of eight valid nominated species and two cryptic species.…”

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confidence: 99%

Three mitochondrial genomes of Pseudogobio fishes (Cypriniformes: Gobionidae)

2020

Mitochondrial DNA Part B

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“…We suggested that those mitochondrial gene evolution may have contributed to group differentiation to different habitats. For example, the Abbottina branch and Biwia complex subbranch mainly lives in lakes (standing water) spawning very sticky eggs [55] with very short and blunt snout [21][22][23], while the Pseudogobio subbranch mainly inhabits rivers (flowing water) spawning adhesive eggs [56] with a relatively depressed and elongated snout [21,57]. The Saurogobio branch A mainly lives in flowing water and smooth lips or with degenerated papillae, while the Saurogobio branch B mainly inhabits relatively standing water and lips with developed papillae [21,53].…”

Section: Mitochondrial Gene Evolution and Group Differentiation And A...mentioning

confidence: 99%

Phylogenetic Relationships of the Pseudogobionini Group (Teleostei: Cyprinidae) with Selection Pressure Analyses to Genes of Mitochondrial Genome

Lin

Zhang

Liu

2023

Fishes

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We newly sequenced complete mitochondrial genomes (mitogenome) of two gudgeon species Saurogobio dabryi and S. punctatus, and we downloaded 49 gudgeon mitogenomes from GenBank to investigate the phylogeny of the Pseudogobionini group and analyze selection pressure of the genes. With genera Gobio, Acanthogobio, and Romanogobio as outgroups, the phylogeny of the Pseudogobionini group was revealed as ((Xenophysogobio + Gobiobotia) + (Saurogobio + (Abbottina + (Pseudogobio + Biwia complex)))) based on the concatenated nucleotide sequences of 13 protein-coding genes (PCGs). Based on the molecular phylogeny and morphological or osteological characters, we proposed a classification system of the Pseudogobionini group. Moreover, five pairs of sister taxa were selected for gene selection pressure analyses to explore the link of mitochondrial gene evolution to group differentiation and adaptations. We detected significantly different dN/dS values in 11 out of 13 (excluding ND3 and ND4L) PCGs in five pairs of clades, significantly different mean dN/dS, dN, and/or dS values in 8 out of 13 PCGs (excluding ND2, ATP8, ND3, ND4L, and ND6) in three pairs of sub-clades and seven positively selected sites in another three pairs of sub-clades. These results indicated that mitochondrial gene evolution might have contributed to group differentiation and adaptations especially for river or lake environments.

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Two new species of Pseudogobio pike gudgeon (Cypriniformes: Cyprinidae: Gobioninae) from Japan, and redescription of P. esocinus (Temminck and Schlegel 1846)

Cited by 6 publications

References 7 publications

Morphological variation associated with trophic niche expansion within a lake population of a benthic fish

Morphological variation associated with trophic niche expansion within a lake population of a benthic fish

Three mitochondrial genomes of Pseudogobio fishes (Cypriniformes: Gobionidae)

Phylogenetic Relationships of the Pseudogobionini Group (Teleostei: Cyprinidae) with Selection Pressure Analyses to Genes of Mitochondrial Genome

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