Chromosomal evidence of downstream dispersal of Astyanax fasciatus (Characiformes, Characidae) associated with river shed interconnection

Peres, Wellington Adriano Moreira; Buckup, Paulo Andreas; Kantek, Daniel Luis Zanella; Bertollo, Luiz Antônio Carlos; Moreira‐Filho, Orlando

doi:10.1007/s10709-009-9389-4

Cited by 15 publications

(9 citation statements)

References 15 publications

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“…For the genus Astyanax , two other examples have been described. Karyomorph A of Astyanax fasciatus , which is characteristic of the upper Paraná River basin, has also been found in the transposition channel of the Piumhi River as well as in tributaries belonging to the hydrographic basin of the São Francisco River, where only its karyomorph B (characteristic of the São Francisco River) had previously been present, thereby representing another case of invasion (Peres et al. , 2009).…”

Section: Discussionmentioning

confidence: 99%

Chromosome characterization and biogeographic relations among three populations of the driftwood catfish Parauchenipterus galeatus (Linnaeus, 1766) (Siluriformes: Auchenipteridae) in Brazil

Lui

Blanco

Margarido

et al. 2010

Biological Journal of the Linnean Society

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The present study employed basic and molecular cytogenetic methods to characterize three populations of Parauchenipterus galeatus from the basins of the Paraná and São Francisco Rivers, and a region of connection between the two basins. Although the diploid number was equal to 58 chromosomes, variations in karyotype formula were detected among the populations. B chromosomes were detected only in the population from the São Francisco River. Heterochromatin was located in the terminal position in almost all the chromosomes and in the pericentromeric position in some acrocentric chromosomes in the three populations. A single nucleolus organizer region was detected by silver nitrate and 18S rDNA-fluorescent in situ hybridization in the short arm of one subtelocentric pair in the three populations, varying only in the chromosome pair bearing this site. The 5S rDNA sites were located in two submetacentric chromosome pairs in the three populations, varying only in the chromosome pairs bearing these sequences. Classic and molecular chromosome markers, along with the context of the natural history of the formation of hydrographic basins, ecological aspects, and the geographic isolation of populations between hydrographic basins and within the same basin, were important contributions to the discussion on possible biogeographic relations among the populations of Parauchenipterus galeatus.

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Section: Discussionmentioning

confidence: 99%

Chromosome characterization and biogeographic relations among three populations of the driftwood catfish Parauchenipterus galeatus (Linnaeus, 1766) (Siluriformes: Auchenipteridae) in Brazil

Lui

Blanco

Margarido

et al. 2010

Biological Journal of the Linnean Society

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“…The results of the present study demonstrate the usefulness of these markers as additional tools for the proper identification of species/populations of Parodontidae, Gymnotidae, and Sternopygidae, and the consequent characterization of groups that now comprise part of the fish fauna of the São Francisco River basin, but have invaded from the upper Paraná River basin. Other species of the genera Hoplias (Blanco et al, 2010) and Astyanax (Peres et al, 2009) have also been characterized as invaders into the São Francisco River basin.…”

Section: Discussionmentioning

confidence: 99%

Cytogenetic identification of invasive fish species following connections between hydrographic basins

et al. 2010

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Chromosome analyses were carried out for several fish species in a region impacted by the connection between two hydrographic basins, where a river originally pertaining to the Paraná River basin was transposed to the São Francisco River basin in the state of Minas Gerais, Brazil. The purpose was to assess the dispersal of invasive species from one hydrographic basin to the other and the consequent new geographical distributions of species that had been previously isolated from each other. Species of the families Parodontidae (Apareiodon piracicabae, A. ibitiensis, Parodon hilarii, and P. nasus), Sternopygidae (Eigenmannia virescens), and Gymnotidae (Gymnotus sylvius) were studied. The four species of Parodontidae had 2n = 54 chromosomes, but speciesspecific karyotype structures, including the presence of the ZZ/ZW sex chromosome system in A. ibitiensis and P. hilarii. Two distinct karyomorphs (A and B) were identified for E. virescens, although with the same diploid number (2n = 38 chromosomes). G. sylvius had 2n = 40 chromosomes. P. hilarii and E. virescens (karyomorph B) are considered to be native to the São Francisco River basin, whereas A. piracicabae, A. ibitiensis, E. virescens (karyomorph A), and G. sylvius are known for the Paraná River basin, and P. nasus is known for the Paraná-Paraguay basin. The presence of the last five species in the São Francisco River basin indicates that they migrated from the Parana River to the São Francisco River basin due to the transposition of the river, and can therefore be considered invasive species in this basin. Moreover, a natural migratory pathway through the former wetland may have affected this dispersal.

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“…Noteworthy is also the cytogenetic contribution for biogeographical analyzes, clarifying the current fish fauna distribution in some important Brazilian river basins. In this sense, native species, as well as invasive ones due to dispersal events or breakdown of geographic isolation, were clearly identified by chromosomal investigations (Peres et al 2009; Blanco et al 2010; Silva et al 2010; Perez et al 2012). As a significant example, Astyanax bimaculatus from two important Brazilian watersheds, namely the São Francisco and Grande rivers share similar morphological characteristics.…”

Section: Catalogue Of Msc Dissertations and Phd Thesesmentioning

confidence: 99%

Contributions to the cytogenetics of the Neotropical fish fauna

Bertollo¹,

Cioffi²,

Galetti³

et al. 2017

CCG

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Brazilian fish cytogenetics started as early as the seventies in three pioneering research groups, located at the Universidade Estadual Paulista (UNESP, Botucatu, SP), Universidade Federal de São Carlos (UFSCar, São Carlos, SP) and Universidade de São Paulo (USP, São Paulo, SP). Investigations that have been conducted in these groups led to the discovery of a huge chromosomal and genomic biodiversity among Neotropical fishes. Besides, they also provided the expansion of this research area, with the genesis of several other South American research groups, in view of a number of dissertations and doctoral theses developed over years. The current authors were encouraged to make their thesis catalog accessible from a public source, in order to share informations on the taxa and subject matter analyzed. Some of the key contributions to evolutionary fish cytogenetics are also being highligthed.

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Chromosomal evidence of downstream dispersal of Astyanax fasciatus (Characiformes, Characidae) associated with river shed interconnection

Cited by 15 publications

References 15 publications

Chromosome characterization and biogeographic relations among three populations of the driftwood catfish Parauchenipterus galeatus (Linnaeus, 1766) (Siluriformes: Auchenipteridae) in Brazil

Chromosome characterization and biogeographic relations among three populations of the driftwood catfish Parauchenipterus galeatus (Linnaeus, 1766) (Siluriformes: Auchenipteridae) in Brazil

Cytogenetic identification of invasive fish species following connections between hydrographic basins

Contributions to the cytogenetics of the Neotropical fish fauna

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