Astyanax hastatus Myers, 1928 (Teleostei, Characidae): a new species complex within the genus Astyanax?

Kavalco, Karine Frehner; Brandão, Karina de Oliveira; Pazza, Rubens; Almeida-Toledo, Lurdes Foresti de

doi:10.1590/s1415-47572009005000055

Cited by 24 publications

(23 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar results were also found in other species of Astyanax (Oliveira et al 1988, Daniel-Silva and Almeida-Toledo 2001, Kavalco et al 2003), including the presence of the first large-sized m chromosome pair, these characteristics being assigned to an ancestral condition in genus (e.g. Portella et al 1988, Ferreira-Neto et al 2009, Kavalco et al 2009, among others). Different from the species that possess these ancestral conditions in the genus, Astyanax correntinus has 2n = 36 and a karyotype containing eight large m - sm chromosome pairs (Fig.…”

Section: Discussionsupporting

confidence: 81%

Basic cytogenetics and physical mapping of ribosomal genes in four Astyanax species (Characiformes, Characidae) collected in Middle Paraná River, Iguassu National Park: considerations on taxonomy and systematics of the genus

Paiz¹,

Baumgärtner²,

Graça³

et al. 2015

CCG

View full text Add to dashboard Cite

Karyotypes and chromosomal characteristics of both minor and major rDNAs in four fish species known popularly as “lambaris”, namely Astyanax abramis (Jenyns, 1842), Astyanax asuncionensis Géry, 1972, Astyanax correntinus (Holmberg, 1891) and Astyanax sp. collected from downstream of the Iguassu Falls (Middle Paraná River basin), preservation area of the Iguassu National Park, were analyzed by conventional and molecular protocols. Astyanax abramis had diploid chromosome number 2n=50 (4m+30sm+8st+8a) and single AgNORs (pair 22), Astyanax asuncionensis had 2n=50 (8m+24sm+6st+12a) and single AgNORs (pair 20), Astyanax sp. had 2n=50 (4m+26sm+8st+12a) and single AgNORs (pair 25), and Astyanax correntinus had 2n=36 (12m+16sm+2st+6a) and multiple AgNORs (pairs 12, 15, 16, 17). FISH with 18S rDNA showed a single site for Astyanax abramis, Astyanax asuncionensis and Astyanax sp. and multiple for Astyanax correntinus (14 sites). FISH with 5S rDNA showed single 5S-bearing loci chromosome pair only for Astyanax asuncionensis and multiple for Astyanax abramis (four sites), Astyanax correntinus (five sites) and Astyanax sp. (four sites). Distinct distribution patterns of heterochromatin were observed for karyotypes of all species, with the exception of the first acrocentric chromosome pair characterized by centromeric, interstitial-proximal and telomeric blocks of heterochromatin on the long arm, which may represent homeology between karyotypes of Astyanax abramis and Astyanax asuncionensis. Our study showed species-specific characteristics which can serve in diagnosis and differentiation between Astyanax abramis and Astyanax asuncionensis, considered cryptic species, as well as strengthening the occurrence of a species of Astyanax not yet described taxonomically. In addition, the data obtained from first cytogenetic studies in Astyanax correntinus suggest a high similarity with Astyanax schubarti Britski, 1964, suggesting that these species may belong to the same morphological group and that can be phylogenetically related.

show abstract

Section: Discussionsupporting

confidence: 81%

Basic cytogenetics and physical mapping of ribosomal genes in four Astyanax species (Characiformes, Characidae) collected in Middle Paraná River, Iguassu National Park: considerations on taxonomy and systematics of the genus

Paiz¹,

Baumgärtner²,

Graça³

et al. 2015

CCG

View full text Add to dashboard Cite

show abstract

“…There are certain groups characterized by large amounts of heterochromatin at terminal position [21,26], that enable to determine cases of both inter-and intraindividual polymorphism [16,17]. On the other hand, these conspicuous blocks are absent in some other species [8,9,13,14,21], although all species share small C-bands at pericentromeric region and interspersed with NORs, similar to the pattern herein described for A. ribeirae (Fig. 2a).…”

Section: Discussionsupporting

confidence: 56%

“…1), except A. scabripinnis from Paraíba do Sul river (4 M+ 10SM+6ST+30A) [29]. The presence of several A chromosomes is also reported in other Astyanax species along the Brazilian coast, such as A. giton, A. intermedius [11], A. scabripinnis [28], and A. hastatus [9], all of them with 36± 2 ST/A chromosomes. Although a misclassification of chromosomal types might have determined slight differences between karyotypes, such differentiation would rather be related to non-numerical chromosomal rearrangements, such as inversions.…”

Section: Discussionmentioning

confidence: 79%

“…2a). Data about the inter-specific homology of a satellite DNA isolated from A. scabripinnis carrying sequences similar to transposable elements [19] have shown that such DNA sequence was quite dispersed in some species, like in the A. scabripinnis and A. fasciatus groups [1,17,26], but is absent in coastal species, like A. giton, A. intermedius and A. hastatus [9,13].…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Molecular cytogenetics of Astyanax ribeirae (Teleostei, Characidae), an endemic characin of the Atlantic rainforest

Kavalco

Pazza

Almeida-Toledo

2010

Nucleus

Self Cite

View full text Add to dashboard Cite

Astyanax ribeirae is a characin fish endemic to Ribeira de Iguape river basin, Brazil. Karyotypic analysis of the specimen from distinct geographic regions depicted similar karyotypic features, i.e. 2n=50 constituting the 4 M+10SM+ 6ST+30A and a fundamental number (FN) equal to 70. Further analysis on linear differentiation using silver nitrate staining, c-banding and rDNA localization revealed single NOR on ST/A chromosomes, heterochromatin blocks in the pericentromeric region of some chromosomes, and four 18S rDNA sites and six 5S rDNA sites, all located on ST/A chromosomes. FISH with As-51 satellite DNA probe presented no homology signals in chromosomes of A. ribeirae, indicating uniqueness of species within the genus Astyanax. The chromosomal and molecular cytogenetic data obtained on A. ribeirae specimens collected from Atlantic rainforest areas are discussed to elucidate relationship between this species and other species in the genus vis-à-vis chromosomal evolution of the group. This is the first report on cytogenetic analysis of Astyanax ribeirae.

show abstract

“…Although this marker has never been used to analyze populations in the 'bimaculatus group', a comparative approach can be accomplished based on the results obtained in other species bearing 2n = 50. All previously analyzed species with 50 chromosomes from coastal river basins ( A. giton , A. hastatus [Kavalco et al, 2009a], A. intermedius and A. ribeirae [Kavalco, 2008]) lack such satellite DNA sequence. On the other hand, some species from Upper Paraná River basin, especially A. fasciatus , have shown a great amount of satDNA As-51 [Pazza et al, 2008a].…”

Section: Comparative Cytogeneticsmentioning

confidence: 99%

Comparative Cytogenetics and Molecular Phylogeography in the Group <i>Astyanax altiparanae – Astyanax </i>aff. <i>bimaculatus</i> (Teleostei, Characidae)

Kavalco

Pazza

Brandão

et al. 2011

Cytogenet Genome Res

View full text Add to dashboard Cite

The genus Astyanax comprises small characin fish of the neotropical region. The so-called ‘yellow-tailed characins’ compose one of the most widely distributed Astyanax groups. A. altiparanae and A. aff. bimaculatus, are evolutionarily closely related and commonly found in several Brazilian hydrographic basins. In the present work, chromosomal data of specimens of A. altiparanae and A. aff. bimaculatus from 4 hydrographic basins in the states of São Paulo (Upper Tietê, Paranapanema, Ribeira de Iguape) and Rio de Janeiro (Guapimirim) are shown. All the populations showed 50 chromosomes, with different karyotypic formula. Although only a single Ag-NOR bearing chromosome pair was observed, all populations possess multiple cistrons of 18S rDNA. FISH with the 5S rDNA probe showed single signals at the interstitial position of one metacentric chromosome pair. C-bands are distributed in the terminal and interstitial regions of several chromosomes. However, the As-51 satDNA are frugally located in a few chromosomes of fishes from Upper Tietê, Paranapanema and Guapimirim Rivers, being absent in individuals of A. aff. bimaculatus from Ribeira de Iguape River basin. Beside these 4 populations, molecular phylogeography studies were also performed in individuals from Middle and Lower Tietê River basin and from 2 additional collection sites in the Paranapanema and Ribeira de Iguape River basins. The phylogeographic analysis using 2 mtDNA regions (totalizing 1.314 bp of ND2 and ATPase6/8 genes) of 8 populations of the group of ‘yellow-tailed characins’ from 3 major hydrographic basins showed structuring of populations, suggesting a correlation between chromosomal (nuclear) and molecular (mitochondrial) data.

show abstract

Astyanax hastatus Myers, 1928 (Teleostei, Characidae): a new species complex within the genus Astyanax?

Cited by 24 publications

References 36 publications

Basic cytogenetics and physical mapping of ribosomal genes in four Astyanax species (Characiformes, Characidae) collected in Middle Paraná River, Iguassu National Park: considerations on taxonomy and systematics of the genus

Basic cytogenetics and physical mapping of ribosomal genes in four Astyanax species (Characiformes, Characidae) collected in Middle Paraná River, Iguassu National Park: considerations on taxonomy and systematics of the genus

Molecular cytogenetics of Astyanax ribeirae (Teleostei, Characidae), an endemic characin of the Atlantic rainforest

Comparative Cytogenetics and Molecular Phylogeography in the Group <i>Astyanax altiparanae – Astyanax </i>aff. <i>bimaculatus</i> (Teleostei, Characidae)

Contact Info

Product

Resources

About