Sinocyclocheilus xiejiahuai (Cypriniformes, Cyprinidae), a new cave fish with extremely small population size from western Guizhou, China

ZooKeys, Год журнала: 2024, Номер 1214, С. 119 - 141

Опубликована: Окт. 3, 2024

This study describes a new species, Sinocyclocheilus xiejiahuai sp. nov ., discovered within cave located in Hongguo Town, Panzhou City, Guizhou Province, southwestern China, with the type locality Nanpanjiang River basin. Phylogenetic trees reconstructed based on mitochondrial genes show that species represents an independent evolutionary lineage large genetic differences, 1.9%–13.8% Cyt b , from congeners. Morphologically, this can be differentiated 79 currently classified under genus by several characteristics: absence of horn-like structures and indistinct elevation at head-dorsal junction, irregular black markings body lateral scaleless, eyes large, eye diameter 13% head length, dorsal-fin rays, iii, 6½, last unbranched ray strong, serrations along posterior margin, pectoral-fin i, 13, anal-fin 5, pelvic-fin 7, line pores 74, gill rakers well developed, nine first arch, pectoral fins short, tip not reaching to origin. The number has been increased 80 since description species.

Язык: Английский

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Adapting to Novel Environments Together: Evolutionary and Ecological Correlates of the Bacterial Microbiome of the World’s Largest Cavefish Diversification (Cyprinidae, Sinocyclocheilus)

Frontiers in Microbiology, Год журнала: 2022, Номер 13

Опубликована: Март 14, 2022

The symbiosis between a host and its microbiome is essential for fitness, this association consequence of the host’s physiology habitat. Sinocyclocheilus , largest cavefish diversification world, an emerging multi-species model system evolutionary novelty, provides excellent opportunity examining correlates history, habitat, gut-microbial community diversity. From diversification-scale patterns habitat occupation, major phylogenetic clades (A–D), geographic distribution, knowledge from captive-maintained populations, we hypothesize to be determinant diversity, with phylogeny playing lesser role. For this, subject environmental water samples fecal (representative gut-microbiome) 24 species, both wild after being in captivity 6 months, bacterial 16S rRNA gene profiling using Illumina sequencing. We see significant differences gut microbiota structure reflective three types; microbiomes too, were influenced by host-related factors. There no phylogeny. However, there some related at clade level, most geographically distant (A D) distinct, two overlapping (B C) showing similarities. Microbes inhabiting not cause fish-gut microbiota, but quality parameters were. Transferring captivity, fish changed significantly became homogenized, signifying plastic changes highlighting importance factors (habitat) assembly. core group, higher taxonomic scale, resembled that other teleost fishes. Our results suggest divergent natural environments giving rise novelties underlying adaptations, also includes these

Язык: Английский

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A long-ignored unique ecosystem of cavefishes in the southern karst: achievements, challenges, and prospects

Environmental Science and Pollution Research, Год журнала: 2023, Номер 30(39), С. 90489 - 90499

Опубликована: Июль 21, 2023

Язык: Английский

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Skin transcriptomic correlates of cave-dwelling Sinocyclocheilus cavefish

Frontiers in Ecology and Evolution, Год журнала: 2023, Номер 11

Опубликована: Окт. 25, 2023

Introduction With 78 species, Sinocyclocheilus cavefish constitute the largest radiation in world. They exhibit remarkable morphological diversity across three habitat types: surface (surface morphs, normal-eyed, variably colored), exclusively-cave-dwelling (stygobitic eyeless, depigmented), and intermediate between cave (stygophilic micro-eyed, partially depigmented). Distinctive traits of include variations eye skin conditions associated with their habitat, despite role sensing environmental changes, its correlates are less understood, compared to well-studied conditions. Methods Here, we analyzed correlation morphology utilizing transcriptomics-based methods. We generated RNA-sequencing data for nine species integrated those existing from five additional species. These 14 represent primary clades major habitats these cavefish. Result identified 7,374 orthologous genes transcriptome data. Using a comparative transcriptomics approach, 1,348 differentially expressed (DEGs) were morphotypes. GO KEGG enrichment analyses suggested that mainly involved energy metabolism, immunity oxidative stress-related functions. Genes related immune, apoptotic, necrotic functions through positive selection analysis genes. The maximum likelihood phylogenetic tree, based on 1,369, single-copy was largely concordant currently established RAD-seq mt-DNA phylogenies. Species higher dependence present lighter coloration, fewer dark blotches, diminished scale coverage. also found differences gene expression effects may have contributed degradation color scales. Discussion Our study highlights significance shaping pigmentation variation, while offering insights into molecular mechanisms driving habitat-specific adaptations . findings underscore transcriptional variation adapting diverse environments contribute future studies evolution ecology

Язык: Английский

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Expansion and contraction of lake basin shape the genetic structure of Sinocyclocheilus (Osteichthyes: Cypriniformes: Cyprinidae) populations in Central Yunnan, China

Ecology and Evolution, Год журнала: 2024, Номер 14(1)

Опубликована: Янв. 1, 2024

Abstract Geological events can strongly affect the genetic structures and differentiation of fish populations. Especially, as an endemic genus Sinocyclocheilus in Yunnan‐Guizhou Plateau, effects key geological on distributions remain poorly understood. Examining phylogeographic patterns fishes be useful for elucidating spatio‐temporal dynamics their population size, dispersal history extent geographical isolation, thereby providing a theoretical basis protection. Here, we used single nucleotide polymorphisms (SNP) method to investigate fishes. Our analysis supports endemicity , but samples different regions contain multiple ancestral components, which displayed more admixed diversified this may due polymorphism ancestors themselves, or gene infiltration caused by hybridization between adjacent species . We estimate that most recent common ancestor (MRCA) Central Yunnan Basin at approximately 3.75~3.11 Ma, infer evolution central is closely related formation plateau lakes (around 4.0~0.02 Ma), identifies Dianchi Lake Fuxian shaping structure. It also first time prove altitude change has great influence variation among populations Sinocyclocheilus.

Язык: Английский

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Variable Eyes Degeneration of the Cave Carp Sinocyclocheilus bicornutus (Cyprinidae) from Guizhou Province, Southwest China

Journal of Ichthyology, Год журнала: 2022, Номер 63(1), С. 41 - 47

Опубликована: Дек. 22, 2022

Язык: Английский

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Habitat correlates of cave-dwelling: A radiation-scale analysis of skin traits and comparative transcriptomics of theSinocyclocheiluscavefish

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2023, Номер unknown

Опубликована: Июль 17, 2023

ABSTRACT With 78 species, Sinocyclocheilus cavefish constitute the largest radiation in world. They exhibit remarkable morphological diversity across three habitat types: surface (Surface morphs, Normal-eyed, variably colored), exclusively-cave-dwelling (Stygobitic Eyeless, depigmented), and intermediate between cave (Stygophilic Micro-eyed, partially depigmented). Distinctive traits of include variations eye skin conditions associated with their habitat, despite role sensing environmental changes, its correlates are less understood, compared to well-studied conditions. Here, we analyzed correlation morphology utilizing transcriptomics-based methods. We generated RNA-sequencing data for nine species integrated those existing from five additional species. These 14 represent primary clades major habitats these cavefish. Data on color scale were 7374 orthologous genes identified. Using a comparative transcriptomics approach, identified 1,348 differentially expressed (DEGs) morphotypes. GO KEGG enrichment analyses suggest that have evolved different strategies energy metabolism, immunity, oxidative stress habitats. also found 329 positive selection (PSGs) mainly involved apoptosis, necrosis, indicating potential adaptations The maximum likelihood phylogenetic tree, based 1369 single-copy was largely concordant currently established RAD-seq mt-DNA phylogenies, but few exceptions. Species higher dependence present lighter coloration, fewer dark blotches, diminished coverage. PCA cluster analysis suggested cave-dwelling characterized by absence black similar expression patterns, convergence adaptation. Variations tyrosine metabolism may explain pigmentation differences among diverse Our study highlights significance shaping variation, while offering insights into molecular mechanisms driving habitat-specific . findings underscore transcriptional variation adapting environments contribute future studies evolution ecology

Язык: Английский

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