Cytogenetics and biogeography: considerations about the natural origin of Hoplias malabaricus (Characiformes, Erythrinidae) on the Iguaçu river

Vicari, Marcelo Ricardo; Pazza, Rubens; Artoni, Roberto Ferreira; Margarido, Vladimir Pavan; Bertollo, Luiz Antônio Carlos

doi:10.1590/s1516-89132006000300015

Cited by 22 publications

(23 citation statements)

References 17 publications

(15 reference statements)

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“…Among these, stands out the Iguaçu River Falls with 82 meters, in addition to other hundreds of waterfalls in the basin, which result from the geological structure caused by basaltic spills. The Iguaçu River and its tributaries features a fauna of small-sized fish, with a high degree of endemism (Vicari et al 2006), possibly due to the geographical isolation given by the Iguaçu River Falls that isolated this river from the lower Paraná River basin .…”

Section: Introductionmentioning

confidence: 99%

Ichthyofauna of streams from the lower Iguaçu River basin, Paraná State, Brazil

et al. 2016

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Abstract:The drainages of the Iguaçu River basin, as well as the main channel of the river, have peculiar characteristics resulting from geomorphological processes in this area, including the formation of the Iguaçu River Falls. This slope in the lower portion of the basin is a biogeographical barrier to many organisms. In this study was inventoried the fish fauna of streams of the lower Iguaçu River basin, evaluating possible differences in the species composition upstream and downstream of this biogeographical barrier. Sampling were conducted between 2004 and 2013, in five streams, three upstream and two downstream of the Iguaçu River Falls, using electrofishing. The nMDS analysis was run to investigate possible groupings of similar fauna between the streams sampled. The scores of this test were tested as to the significance of groupings with the Hotelling T 2 test. The indicator value method (IndVal) was used to detect the distribution of species among the groups of the streams upstream and downstream of the Iguaçu River Falls. We collected 18,908 individuals of six orders, 11 families, and 40 species. Siluriformes and Characiformes had the highest species richness; Cyprinodontiformes presented the highest abundance. Considering the species recorded, 21 are considered natives to the Iguaçu River basin, including 15 endemic, wich were found only in streams upstream of the falls. Additional 18 species were verified only in the streams downstream of such barrier. Four species were common to both stretches. The axis 1 of the nMDS separated two groups: streams upstream (S1, S2 and S3) and streams downstream of the Iguaçu River Falls (S4 and S5). The indicator species analysis also indicated a distinction between the groups of streams, that were significantly different (Hotelling's T 2 = 234.36, p ˂ 0.0001). The number of endemic species in the streams upstream of the Falls (15 spp.) evidences a significant effect of isolation promoted by the Iguaçu River Falls, and confirms the role of this barrier in the vicariant processes and endemism typical of this basin. These results emphasize the importance of conserving these ecosystems, once the extinction of species in this region means the irreversible loss of them. Resumo: As drenagens da bacia do rio Iguaçu, bem como o canal principal do rio, possuem características peculiares resultantes de processos geomorfológicos dessa área, incluindo a formação das Cataratas do rio Iguaçu. Esse desnível na porção inferior da bacia constitui uma barreira biogeográfica para muitos organismos. Neste trabalho inventariamos a fauna de peixes de riachos na porção do baixo rio Iguaçu, avaliando possíveis diferenças na composição de espécies acima e abaixo dessa barreira biogeográfica. Entre 2004 e 2013, foram amostrados cinco riachos, sendo três localizados acima das Cataratas do Iguaçu e dois abaixo, por meio de pesca elétrica. Para investigar possíveis padrões de agrupamentos de fauna similares entre os riachos amostrados foi

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Section: Introductionmentioning

confidence: 99%

Ichthyofauna of streams from the lower Iguaçu River basin, Paraná State, Brazil

et al. 2016

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“…Most cytogenetic analyses within single families, especially in Neotropical species, suggest that karyotypic diversification occurred by the accumulation of population changes, either as a consequence of vicariant events involving large basins or geographic areas or by the fixation of chromosomal rearrangements in small isolated populations (Bertollo et al 2000, Vicari et al 2006.…”

Section: Introductionmentioning

confidence: 99%

Preferential accumulation of sex and Bs chromosomes in biarmed karyotypes by meiotic drive and rates of chromosomal changes in fishes

Molina

Martínez

Bertollo

et al. 2014

An. Acad. Bras. Ciênc.

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Mechanisms of accumulation based on typical centromeric drive or of chromosomes carrying pericentric inversions are adjusted to the general karyotype differentiation in the principal Actinopterygii orders. Here, we show that meiotic drive in fish is also supported by preferential establishment of sex chromosome systems and B chromosomes in orders with predominantly bi-brachial chromosomes. The mosaic of trends acting at an infra-familiar level in fish could be explained as the interaction of the directional process of meiotic drive as background, modulated on a smaller scale by adaptive factors or specific karyotypic properties of each group, as proposed for the orthoselection model.

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“…The general location pattern of pericentromeric and telomeric heterochromatin detected in specimens from the Taquari River is usually found in different populations of H. malabaricus (Lopez, Fenocchio, 1994;Born, Bertollo, 2001;Vicari et al, 2003Vicari et al, , 2006, although minor differences may also occur among karyomorphs/populations. However, the most contrasting features between both karyomorphs here analyzed refer to the nucleolar organizer regions and location of GC-rich chromosomal sequences.…”

Section: Discussionmentioning

confidence: 99%

Differential chromosomal markers between sympatric karyomorphs of the fish Hoplias malabaricus (Bloch, 1794) (Characiformes: Erythrinidae)

Rosa

Rubert²,

Giuliano-Caetano

et al. 2010

CCG

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Abstract. Cytogenetic analyses were performed on Hoplias malabaricus (Bloch, 1794) from the Taquari River, Parana River drainage, revealing two sympatric karyomorphs. One karyomorph was characterized by 2n = 40 m/sm and 2n = 39 m/sm chromosomes for females and males, respectively, and an X 1 X 1 X 2 X 2 /X 1 X 2 Y sex chromosome system. In the second karyomorph, specimens showed 2n = 42 m/sm chromosomes, without sex-related heteromorphism. Both karyomorphs were characterized by a distribution of heterochromatin in the pericentromeric and telomeric regions. In addition to the differences in the diploid numbers and the sex chromosomes, the GC-rich sites and the nucleolar organizer regions also showed clear differences between the karyomorphs. Coupled with the occurrence of unique chromosomal features within each karyomorph, the fact that hybrids have not been identifi ed in the sampled population provides additional support of the existence of a species complex in H. malabaricus.

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Cytogenetics and biogeography: considerations about the natural origin of Hoplias malabaricus (Characiformes, Erythrinidae) on the Iguaçu river

Abstract: Hoplias malabaricus (trahyra) is a widespread fish species over the Neotropical region with diversified inter

Cited by 22 publications

References 17 publications

Ichthyofauna of streams from the lower Iguaçu River basin, Paraná State, Brazil

Ichthyofauna of streams from the lower Iguaçu River basin, Paraná State, Brazil

Preferential accumulation of sex and Bs chromosomes in biarmed karyotypes by meiotic drive and rates of chromosomal changes in fishes

Differential chromosomal markers between sympatric karyomorphs of the fish Hoplias malabaricus (Bloch, 1794) (Characiformes: Erythrinidae)

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