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| Registros recuperados: 1.204 | |
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| Terán,Guillermo E.; Ballen,Gustavo A.; Alonso,Felipe; Aguilera,Gastón; Mirande,J. Marcos. |
| ABSTRACT A new species of Farlowella is described from the Bermejo River basin, in Salta and Jujuy provinces, northwestern Argentina. The new species belongs to the Farlowella nattereri species group. The new species is diagnosed by the following combination of characters: marbled rostrum, five rows of lateral plates series, relatively short snout (snout-mouth length less than 50.0% of head length), complete half-moon shaped spot on caudal fin, and short predorsal distance (37.8-41.8% of standard length). |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Armored catfish; Chaco Ecoregion; Endemic species; Loricariinae; Taxonomy. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000200206 |
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| Pelicice,Fernando Mayer; Azevedo-Santos,Valter M.; Esguícero,André Luiz Henríques; Agostinho,Angelo Antonio; Arcifa,Marlene Sofia. |
| ABSTRACT The Paranapanema River is a major tributary of the upper Paraná river basin. Eleven hydropower dams regulate its main course, but no study has investigated fish diversity in these impoundments at the basin-scale. The present study investigated spatial patterns of richness, composition, and abundance of native (non-migratory and migratory) and non-native fishes in the cascade of reservoirs along the Paranapanema River. The study is based on data collected from 34 independent studies conducted in nine reservoirs (47 samples). The compilation recorded 161 species, being 111 native (14 migratory) and 50 non-native. Total richness ranged between 56 and 112 species/reservoir, with a mean of 72 (49.9 non-migratory, 8.1 migratory and 14 non-native). The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dam; Fish fauna; Longitudinal; Migratory fish; Non-native. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000200213 |
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| Crampton,William G. R.. |
| The discus fishes of the genus Symphysodon are popular ornamental cichlids that occur in floodplain lakes and flooded forests of the lowland Amazon Basin. These habitats are characterized by extreme seasonal fluctuations in the availability of food, shelter and dissolved oxygen, and also the densities of predators and parasites. Most aspects of discus biology are influenced by these fluctuating conditions. This paper reports an autoecological study of the western Amazonian discus S. haraldi (until recently classified as S. aequifasciatus). This species feeds predominantly on algal periphyton, fine organic detritus, plant matter, and small aquatic invertebrates. At high water it forages alone or in small groups in flooded forests. At low water it forms... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Flooded forest; Ornamental fishes; Parasite; Reproduction. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400008 |
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| Sousa,Raniere G. C.; Freitas,Carlos E. de C.. |
| The functioning of large river systems with adjacent floodplains is strongly influenced by the flood pulse. This phenomenon is the main structuring force for the biota, including fish communities that use floodplain environments for spawning, feeding, nursery and refuge. In floodplains and in the entire basin, the volume of water controls internal flows. During rising water, the high discharge of the river acts as a natural barrier to the canals that connect floodplain lakes and the Solimões River, because the water flows from river to lake. During the dry period, there is a reduction of discharge and the water flow is reversed or stationary. These canals are environments with distinct ecological characteristics such as differentiated limnology and water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazon; Seasonality; Freshwater fish. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000200013 |
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| Couto,Thiago Belisário d'Araújo; Aquino,Pedro De Podestà Uchôa de. |
| This study aims to characterize the spatial and seasonal distribution of the fish assemblage and evaluate the integrity of streams in a sustainable use area that includes integral protection conservation units in Distrito Federal, Central Brazil (Cerrado biome). For the study, 12 stretches of 8 streams were sampled in 2008 (dry season) and 2009 (wet season). For that evaluation was estimated the Physical Habitat Index (PHI), vegetation cover (VC), pH, dissolved oxygen, turbidity, and conductivity. We recorded 22 species, about eight undescribed species, by a total of 2,327 individuals. The most representative families in number of species were Characidae (31.8%), Loricariidae (31.8%), and Crenuchidae (13.6%). Knodus moenkhausii was the most abundant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cerrado; Habitat quality; Headwaters; Upper Paraná river. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000200023 |
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| Martínez-Palacios,Carlos A.; Concha-Santos,Sibila; Toledo-Cuevas,Elva M.; Ríos-Durán,María G.; Martínez-Chávez,Carlos C.; Navarrete-Ramírez,Pamela; Raggi,Luciana; Strussmann,Carlos; Hualde,Juan P.; Demicheli,Mariela A.; Fonseca-Madrigal,Jorge. |
| ABSTRACT Docosahexaenoic acid (DHA) is the most critical and least available omega-3 fatty acid in the Western human diet. Currently, the source of omega-3 long chain polyunsaturated fatty acids (LC-PUFA) is mainly dependent on wild fisheries, making this resource unsustainable in the foreseeable future. In recent years, a high rate of biosynthesis and accumulation of DHA has been discovered in a freshwater species (Chirostoma estor) belonging to the Atherinopsidae family. Interest in evaluating fatty acid composition in other members of the family has emerged, so this study compiles original data of flesh composition of eight atherinopsid species from freshwater and brackish environments, either wild or cultured. High levels of DHA (16 to 31%) were found... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Atherinopsid fish; Chirostoma; Menidia; Odontesthes; Omega-3. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000200203 |
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| Rosa,Renata da; Rubert,Marceléia; Malabarba,Luiz R.; Martins-Santos,Isabel Cristina; Giuliano-Caetano,Lucia. |
| The genus Astyanax is prominent among Characiformes, due to the large number of species found and its wide geographic distribution. In this work, Astyanax laticeps specimens from the laguna dos Patos system were cytogenetically analyzed. A diploid number of 2n = 50 chromosomes distributed into 6m+16sm+16st+12a (FN = 88) was found, without differences between males and females. A few small heterochromatin blocks were observed, besides three more conspicuous C-bands, corresponding to NORs, as confirmed by silver nitrate and CMA3 staining, FISH, and DAPI negative staining. These regions were located in a medium-sized subtelocentric and in a large subtelocentric chromosomal pair, probably because of a deletion of this region in one homologous chromosome, or... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Astyanax scabripinnis species complex; RDNA; Homologous transposition. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400007 |
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| Seyboth,Elisa; Condini,Mario V; Albuquerque,Cristiano Q; Varela Jr,Antônio S; Velasco,Gonzalo; Vieira,João P; Garcia,Alexandre M. |
| The dusky grouper, Mycteroperca marginata, is an important commercial marine fish that is currently considered an endangered species worldwide and listed as overexploited in Brazil. Although its reproductive biology has been studied elsewhere, no information is available for populations in its southernmost distribution limit on the Brazilian coast. The present work investigates age structure, growth and reproduction of individuals inhabiting a pair of rocky jetties, about 4.5 km long each, located in the mouth of Patos Lagoon in the municipality of Rio Grande, in the southwestern Atlantic Ocean. A total of 130 individuals obtained between February 2007 and May 2009 were analyzed, with total length ranging from 260 to 800 mm. The growth coefficient found in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Endangered species; Epinephelus marginatus; Patos Lagoon; Rocky jetties. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000400016 |
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| Conde-Saldaña,Cristhian C.; Albornoz-Garzón,Juan G.; López-Delgado,Edwin O.; Villa-Navarro,Francisco A.. |
| ABSTRACT Ecomorphological patterns of the fish community were evaluated in the trans-Andean Alvarado River drainage, Colombia. A total of 29 species using 25 ecomorphological indices were analyzed to test how well the ecomorphological patterns are related to the fish assemblage. Although a significant correlation was found (Mantel test) between morphological attributes and trophic guilds, habitat use and distribution across the altitudinal gradient, only the last two were significantly independent of the phylogenetic relationships (partial Mantel test). Regarding the ecomorphological space, two main trends were defined. First, benthic periphytivores and invertivores were characterized by having dorsal or dorsolateral eyes, labial appendages, depressed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alvarado River drainage; Community ecology; Habitat use; Morphological diversity; Neotropical region. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000400204 |
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| Pereira,Thiago N. A.; Castro,Ricardo M. C.. |
| Utiaritichthysesguiceroi is described from the upper portion of the rio Juruena, rio Tapajós drainage, Mato Grosso State, Central Brazil. The new species distinguished from its two congeners, U. sennaebragai Miranda Ribeiro and U. longidorsalis Jégu, Tito de Morais & Santos, by having 99 to 101 perforated scales on lateral line (vs. 69 to 83), presence of 17 to19 prepelvic spines (vs. 9-13 in U. sennaebragai and 28-31 in U. longidorsalis), 20 to 21 postpelvic spines (vs. 15 to 19 in U. sennaebragai, and 14 in U. longidorsalis), and 23 to 25 circumpeduncular scales (vs. 30-48 in U. sennaebragai, and 33-35 in U. longidorsalis). Furthermore, the new species differs from U. longidorsalis by having larger interdorsal width,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Neotropical fish; Pacú borracha; Systematics; Taxonomy; Upper Juruena basin. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000200397 |
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| Albert,James S.; Val,Pedro; Hoorn,Carina. |
| ABSTRACT We review geological evidence on the origin of the modern transcontinental Amazon River, and the paleogeographic history of riverine connections among the principal sedimentary basins of northern South America through the Neogene. Data are reviewed from new geochronological datasets using radiogenic and stable isotopes, and from traditional geochronological methods, including sedimentology, structural mapping, sonic and seismic logging, and biostratigraphy. The modern Amazon River and the continental-scale Amazon drainage basin were assembled during the late Miocene and Pliocene, via some of the largest purported river capture events in Earth history. Andean sediments are first recorded in the Amazon Fan at about 10.1-9.4 Ma, with a large increase... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biostratigraphy; Geochronology; Landscape Evolution Model; River capture; Transcontinental Amazon. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000300306 |
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| Oliveira,Ezequiel A. de; Sassi,Francisco de M. C.; Perez,Manolo F.; Bertollo,Luiz A. C.; Ráb,Petr; Ezaz,Tariq; Hatanaka,Terumi; Viana,Patrik F.; Feldberg,Eliana; Oliveira,Edivaldo H. C. de; Cioffi,Marcelo de B.. |
| Abstract The South American giant fishes of the genus Arapaima, commonly known as pirarucu, are one of the most iconic among Osteoglossiformes. Previously cytogenetic studies have identified their karyotype characteristics; however, characterization of cytotaxonomic differentiation across their distribution range remains unknown. In this study, we compared chromosomal characteristics using conventional and molecular cytogenetic protocols in pirarucu populations from the Amazon and Tocantins-Araguaia river basins to verify if there is differentiation among representatives of this genus. Our data revealed that individuals from all populations present the same diploid chromosome number 2n=56 and karyotype composed of 14 pairs of meta- to submetacentric and 14... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: CGH; Chromosome banding; Fish cytotaxonomy; Osteoglossomorpha; RDNA FISH. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000400201 |
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| Registros recuperados: 1.204 | |
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