Divergent karyotypes of the annual killifish genus Nothobranchius (Cyprinodontiformes, Nothobranchiidae)

Krysanov, E. Yu.; Демидова, Т. Б.; Nagy, Božidar

doi:10.3897/compcytogen.v10i3.9863

Cited by 15 publications

(28 citation statements)

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“…Most of the studied species did not display morphologically distinguished sex chromosomes. Sex chromosomes were found only in six species, namely N. guentheri ( Ewulonu et al 1985 ), N. brieni ( Krysanov et al 2016 ), N. lourensi , N. janpapi , N. ditte and F. thierryi (this study) where multiple sex chromosome system of X 1 X 1 X 2 X 2 /X 1 X 2 Y type was found. Neo-Y chromosome likely originated through Robertsonian fusion of the original Y chromosome and autosome as was shown for another fish species ( Kitano and Peichel 2012 ).…”

Section: Discussionmentioning

confidence: 51%

“…There are species in the subgenus possessing 2n higher than 38. The highest 2n = 49/50 among studied species was discovered in N. brieni ( Krysanov et al 2016 ) where all autosomes in the karyotype were acrocentric ( NF = 50). N. brieni had karyotype with differentiated heteromorphic sex chromosomes X 1 X 1 X 2 X 2 /X 1 X 2 Y type (Krysanov et al 2016).…”

Section: Resultsmentioning

confidence: 91%

“…Karyotypes of 30 species were described earlier and high karyotype variability was revealed (summarized in Arai 2011 ). The diploid chromosome number (2n) of Nothobranchius species varies from 16 to 50 ( Scheel 1990 , Krysanov et al 2016 ). Two species N. guentheri (Pfeffer, 1893) and N. brieni Poll, 1938 had multiple chromosome system ( Ewulonu et al 1985 , Krysanov et al 2016 ).…”

Section: Introductionmentioning

confidence: 99%

“…The diploid chromosome number (2n) of Nothobranchius species varies from 16 to 50 ( Scheel 1990 , Krysanov et al 2016 ). Two species N. guentheri (Pfeffer, 1893) and N. brieni Poll, 1938 had multiple chromosome system ( Ewulonu et al 1985 , Krysanov et al 2016 ). Thus, the representatives of the genus Nothobranchius is a good model for studying karyotype differentiation due to high karyotype variability and features of the life cycle.…”

Section: Introductionmentioning

confidence: 99%

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Extensive karyotype variability of African fish genus Nothobranchius (Cyprinodontiformes)

Krysanov

Демидова

2018

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Karyotypes of 65 species of the genus Nothobranchius Peters, 1868 were reviewed and of those 35 examined first time. The results of present study have shown that fishes of the genus Nothobranchius possessed highly diverse karyotypes. The diploid chromosome number (2n) ranged from 16 to 50. The most frequent 2n was 2n = 36 (in 35 species) while the second one 2n = 38 (in 13 species). Proportion of biarmed chromosomes varied from 0 to 95% between species. Diploid chromosome number variability apparently exists as a result of chromosomal fusions or fissions and extensive karyotypic formula alterations promoting by inversions. Multiple sex chromosomes of system X1X1X2X2/X1X2Y type were found only in karyotypes of 5 species. The extensive karyotype variability, unusual for teleosts, of genus Nothobranchius can be likely associated with the characteristics of its life cycle and inhabiting under unstable environment of East African savannah temporal pools.

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Section: Discussionmentioning

confidence: 51%

Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Extensive karyotype variability of African fish genus Nothobranchius (Cyprinodontiformes)

Krysanov

Демидова

2018

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“…Once allopatry is established speciation without ecological divergence potentially occurs via intense genetic drift in found populations without gene flow, driving reproductive isolation [38]. Alternatively, Nothobranchius exhibit a diverse array of karyotypes, therefore chromosomal speciation may cause speciation and may prevent hybridization upon secondary contact [96]; this process is detected in another non-adaptive radiation [26].…”

Section: Discussionmentioning

confidence: 99%

Live fast, diversify non-adaptively: evolutionary diversification of exceptionally short-lived annual killifishes

2019

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BackgroundAdaptive radiations are triggered by ecological opportunity – the access to novel niche domains with abundant available resources that facilitate the formation of new ecologically divergent species. Therefore, as new species saturate niche space, clades experience a diversity-dependent slowdown of diversification over time. At the other extreme of the radiation continuum, non-adaptively radiating lineages undergo diversification with minimal niche differentiation when ‘spatial opportunity’ (i.e. areas with suitable ‘ancestral’ ecological conditions) is available. Traditionally, most research has focused on adaptive radiations, while empirical studies on non-adaptive radiations remain lagging behind. A prolific clade of African fish with extremely short lifespan (Nothobranchius killifish), show the key evolutionary features of a candidate non-adaptive radiation – primarily allopatric species with minimal niche and phenotypic divergence. Here, we test the hypothesis that Nothobranchius killifish have non-adaptively diversified. We employ phylogenetic modelling to investigate the tempo and mode of macroevolutionary diversification of these organisms.ResultsNothobranchius diversification has proceeded with minor niche differentiation and minimal morphological disparity among allopatric species. Additionally, we failed to identify evidence for a role of body size or biogeography in influencing diversification rates. Diversification has been homogeneous within this genus, with the only hotspot of species-richness not resulting from rapid diversification. However, species in sympatry show higher disparity, which may have been caused by character displacement among coexisting species.ConclusionsNothobranchius killifish have proliferated following the tempo and mode of a non-adaptive radiation. Our study confirms that this exceptionally short-lived group have diversified with minimal divergent niche adaptation, while one group of coexisting species seems to have facilitated spatial overlap among these taxa via the evolution of ecological character displacement.Electronic supplementary materialThe online version of this article (10.1186/s12862-019-1344-0) contains supplementary material, which is available to authorized users.

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Sex chromosome differentiation via changes in the Y chromosome repeat landscape in African annual killifishes Nothobranchius furzeri and N. kadleci

et al. 2022

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Divergent karyotypes of the annual killifish genus Nothobranchius (Cyprinodontiformes, Nothobranchiidae)

Cited by 15 publications

References 14 publications

Extensive karyotype variability of African fish genus Nothobranchius (Cyprinodontiformes)

Extensive karyotype variability of African fish genus Nothobranchius (Cyprinodontiformes)

Live fast, diversify non-adaptively: evolutionary diversification of exceptionally short-lived annual killifishes

Sex chromosome differentiation via changes in the Y chromosome repeat landscape in African annual killifishes Nothobranchius furzeri and N. kadleci

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