Search

Your search keyword '"Upper Paraná River basin"' showing total 5 results
Start Over Descriptor "Upper Paraná River basin" Topic catfishes
5 results on '"Upper Paraná River basin"'

1. Identification of cryptic species in allopatric populations of Hypostomus tietensis (Siluriformes: Loricariidae) through cytogenetics analyses.

Author

de Paula, Gabriela B. N., Gavazzoni, Mariane, Zawadzki, Cláudio H., Fernandes, Carlos A., Portela-Castro, Ana L. B., Lui, Roberto L., and Margarido, Vladimir P.

Subjects
*CATFISHES, *CYTOGENETICS, *SPECIES, *WATERSHEDS, *IDENTIFICATION, *CHROMOSOMES
Abstract

Hypostomus is the most specious genus of Hypostominae, composed of several species with high intraspecific morphological and color pattern variation, making their identification a complex issue. One of the species with problematic identification is Hypostomus tietensis that was described from a single specimen, resulting in uncertainties about its color pattern and correct identification. To assist in this context, cytogenetic analyzes were carried out in three putative populations of H. tietensis from the Upper Paraná River basin, one of them from the type locality. The three populations showed considerable cytogenetic differences, with 2n = 72 chromosomes for the population from the type locality and 2n = 76 chromosomes for the others. Terminal NORs were detected (Ag- and 18S rDNA-FISH), being simple for the type locality population (acrocentric pair 23, long arm) and the Pirapó River (subtelocentric pair 11, short arm), and multiple for Do Campo River (subtelocentric pairs 11 and 12, short and long arm, respectively). C-banding was efficient in differentiating the type locality population from the others. Cytogenetic data revealed that populations from Pirapó and Do Campo rivers, although treated until now as Hypostomus aff. tietensis, represent a cryptic species, and those morphological analyses are necessary to differentiate and for describing this new species. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

2. Association between Ichthyocladius (Diptera: Chironomidae) and armored catfishes in the Guareí River basin, São Paulo State, Brazil

Author

VALTER M. AZEVEDO-SANTOS, ERIKA M. SHIMABUKURO, FERNANDO M. PELICICE, and RAOUL HENRY

Subjects
Multidisciplinary, Rivers, Loricariidae, Animals, Fresh Water, larvae, pupae, insects, fish fins, Chironomidae, Catfishes, Brazil, Upper Paraná River basin
Abstract

Ichthyocladius is a genus of chironomid (Diptera, Insecta) whose immature forms live attached to the bodies of some species of freshwater fishes. Here we investigate the association between Ichthyocladius spp. and armored catfish in streams of the Guareí River basin, Paraná River system, Brazil. We provide the first record of I. lilianae associated with fish in the São Paulo State and the Paraná River basin. In addition, this is the first report of Ichthyocladius associated with the armored catfishes Hypostomus iheringii and H. tietensis. Lastly, we record two undescribed species of Chironomidae (i.e., Ichthyocladius sp. 1 and Ichthyocladius sp. 2) associated with fishes.

Published
2022
Full Text
View/download PDF

3. A new species of Phenacorhamdia Dahl 1961 (Siluriformes: Heptapteridae) from the Paranapanema River basin, southeastern Brazil

Author

Gabriel S. C. Silva and Universidade Estadual Paulista (Unesp)

Subjects
Tail, Drainage basin, Ribs, Biology, Structural basin, Heptapteridae, Rivers, Parana river, Animals, Animalia, Chordata, Ecology, Evolution, Behavior and Systematics, Catfishes, Upper Paraná River basin, Taxonomy, geography, geography.geographical_feature_category, Actinopterygii, Fish fin, Neotropical freshwaters fishes, Anatomy, Biodiversity, biology.organism_classification, Phenacorhamdia, Animal Science and Zoology, Taxonomy (biology), Brazil, Siluriformes
Abstract

Made available in DSpace on 2021-06-25T10:46:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-12-02 A new species of Phenacorhamdia is described from Paranapanema River, Upper Paraná River basin, southeastern Brazil. The new species is distinguished from congeners by the combination of following characters 45-46 vertebrae; an entirely dark-brown body; nine pleural ribs; eight branched rays in upper lobe of caudal fin; seven branched rays in pectoral fin; 13 anal-fin rays with 9-10 branched; first basal radial inserted at the 13th vertebrae and eight branchiostegal rays. Laboratório de Ictiologia Setor de Zoologia Campus de Botucatu Universidade Estadual Paulista IBB/UNESP Laboratório de Ictiologia Setor de Zoologia Campus de Botucatu Universidade Estadual Paulista IBB/UNESP

Published
2020

4. First cytogenetic studies of the genus Heptapterus (Actinopterygii, Siluriformes): karyotype differentiation and review of cytogenetic data on the Heptapteridae family.

Author

Yano, C. F. and Margarido, V. P.

Subjects
*CATFISHES, *CYTOGENETICS, *KARYOTYPES, *KARYOKINESIS, *HETEROCHROMATIC genes, *CROSSING over (Genetics), *CHROMOSOMAL translocation
Abstract

The Neotropical fish Heptapterus mustelinus, collected in the Pindorama stream of the upper Paraná River basin (Brazil), was studied cytogenetically, verifying 54 chromosomes (26 m + 18 m + 4 st + 6 a). This diploid number has not been reported among the Heptapteridae that have been studied to date. Unlike most species of the family, there were multiple Ag-nucleolar organizer regions (NOR) and heterochromatin present in the centromeric region of most of the chromosomes of the complement, being Chromomycin A3 (CMA3+)/4′,6-diamidino-2-phenylindole (DAPI−) in nine chromosomal pairs, besides the one that coincides with the Ag-NORs. The data presented in this work reveal a different path in the karyotypic evolution of H. mustelinus when compared to the others Heptapteridae genera. [ABSTRACT FROM AUTHOR]

Published
2012
Full Text
View/download PDF

5. Can DNA barcoding accurately discriminate megadiverse Neotropical freshwater fish fauna?

Author

F. Foresti, Robert Hanner, Claudio Oliveira, Luiz Henrique Garcia Pereira, Universidade Estadual Paulista (Unesp), and University of Guelph

Subjects
0106 biological sciences, Fauna, Biodiversity, gene sequence, Characiformes, 010603 evolutionary biology, 01 natural sciences, DNA barcoding, COI, 03 medical and health sciences, Rivers, genetic variability, Genetics, Animals, DNA Barcoding, Taxonomic, Genetics(clinical), 14. Life underwater, Genetics (clinical), Catfishes, Phylogeny, 030304 developmental biology, Upper Paraná River basin, 0303 health sciences, nonhuman, biology, Ecology, clinical effectiveness, Reproductive isolation, South America, biology.organism_classification, Perciformes, Genetic divergence, freshwater fish, Evolutionary biology, Freshwater fish, Pisces, Overlooked species, Taxonomy (biology), Siluriformes, Research Article
Abstract

Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:28:39Z No. of bitstreams: 0Bitstream added on 2014-05-27T14:48:15Z : No. of bitstreams: 1 2-s2.0-84874678861.pdf: 2359509 bytes, checksum: 9a09e1d02cf4d5942469ea1463918f74 (MD5) Made available in DSpace on 2014-05-27T11:28:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-03-09 Background: The megadiverse Neotropical freshwater ichthyofauna is the richest in the world with approximately 6,000 recognized species. Interestingly, they are distributed among only 17 orders, and almost 80% of them belong to only three orders: Characiformes, Siluriformes and Perciformes. Moreover, evidence based on molecular data has shown that most of the diversification of the Neotropical ichthyofauna occurred recently. These characteristics make the taxonomy and identification of this fauna a great challenge, even when using molecular approaches. In this context, the present study aimed to test the effectiveness of the barcoding methodology (COI gene) to identify the mega diverse freshwater fish fauna from the Neotropical region. For this purpose, 254 species of fishes were analyzed from the Upper Parana River basin, an area representative of the larger Neotropical region.Results: Of the 254 species analyzed, 252 were correctly identified by their barcode sequences (99.2%). The main K2P intra- and inter-specific genetic divergence values (0.3% and 6.8%, respectively) were relatively low compared with similar values reported in the literature, reflecting the higher number of closely related species belonging to a few higher taxa and their recent radiation. Moreover, for 84 pairs of species that showed low levels of genetic divergence (2%), pointing to at least 23 strong candidates for new species.Conclusions: Our study is the first to examine a large number of freshwater fish species from the Neotropical area, including a large number of closely related species. The results confirmed the efficacy of the barcoding methodology to identify a recently radiated, megadiverse fauna, discriminating 99.2% of the analyzed species. The power of the barcode sequences to identify species, even with low interspecific divergence, gives us an idea of the distribution of inter-specific genetic divergence in these megadiverse fauna. The results also revealed hidden genetic divergences suggestive of reproductive isolation and putative cryptic speciation in some species (23 candidates for new species). Finally, our study constituted an important contribution to the international Barcoding of Life (iBOL.org) project, providing barcode sequences for use in identification of these species by experts and non-experts, and allowing them to be available for use in other applications. © 2013 Pereira et al.; licensee BioMed Central Ltd. Laboratory of Biology and Genetic of Fish Department of Morphology Biosciences Institute, State University of São Paulo, São Paulo Biodiversity Institute of Ontario and Department of Integrative Biology University of Guelph, Guelph, ON

Published
2012

Catalog

Books, media, physical & digital resources
See catalog results