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Ichthyofauna of the Ribeirão Frutal and tributaries, upper Rio Paraná basin, Minas Gerais, Southeastern Brazil

Ichthyofauna of the Ribeirão Frutal and tributaries, upper Rio Paraná basin, Minas Gerais, Southeastern Brazil

We found a total of five non-native species in Ribeirão Frutal basin: Oreochromis niloticus, native to the Afrotropical region (Welcomme 1988), Poecilia reticulata, described based on material from “Caracas” (Peters 1859, p. 412), in Venezuela, Metynnis lippincottianus and C. cf. piquiti, both native to the Amazon basin (Jégu 2003, Kullander & Ferreira 2006), and Knodus moenkhausii, which is not native to the upper Rio Paraná basin according to Langeani et al. (2007). Hyphessobrycon eques was found only in two tributaries of the Ribeirão Frutal basin (see Tab. 3). Castro et al. (2004) were not certain whether this species was native to the Rio Grande. With no evidence to suggest recent introduction of this species to the Ribeirão Frutal, we will tentatively
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Genetic variability of Hypostomus (Teleostei, Loricariidae) from the Ribeirão Maringá, a stream of the upper Rio Paraná basin, Brazil

Genetic variability of Hypostomus (Teleostei, Loricariidae) from the Ribeirão Maringá, a stream of the upper Rio Paraná basin, Brazil

Hypostomus sp. 2 were sampled in the Ribeirão Maringá, which is a small effluent of the Rio Pirapó, Rio Paranapa- nema, upper Rio Paraná basin. Samples of white skeletal muscle, liver and heart tissues were removed from the fishes immediately after capture. Tissues were stored in liq- uid nitrogen until analyses. Electrophoretic procedures were detailed in Zawadzki et al. (1999). The nomenclature used was proposed by the International Union of Biochem- istry and Molecular Biology (1992). Data were analyzed using POPGENE 1.31 software (Yeh and Boyle, 1997). The genetic interpretation of the enzymatic patterns was based on the quaternary structure of the enzymes described by Ward et al. (1992).
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Genetic structuring of Salminus hilarii Valenciennes, 1850 (Teleostei: Characiformes) in the rio Paraná basin as revealed by microsatellite and mitochondrial DNA markers

Genetic structuring of Salminus hilarii Valenciennes, 1850 (Teleostei: Characiformes) in the rio Paraná basin as revealed by microsatellite and mitochondrial DNA markers

Conservation implications of genetic structuring. In Neotropical freshwater ecosystems lacking anthropogenic influences, different patterns of distribution of interpopulation genetic variability can occur. Migratory fish species in large ecosystems, such as the Pantanal in the State of Mato Grosso, Brazil, may be under the influence of hydrological factors, such as seasonal flood pulses, that genetically homogenize populations, thereby bringing them close to panmixia (as in pacu Piaractus mesopotamicus, Calcagnotto & DeSalle, 2009; Iervorlino et al., 2010). In other cases, non-migratory species or those species making but short migrations tend to show more significant levels of population genetic structure (as in Tietê tetra Brycon insignis- Matsumoto & Hilsdorf (2009); and spotted sorubim catfish Pseudoplatystoma corruscans- Pereira et al. (2009); Carvalho et al. (2012)). Here, S. hilarii populations showed genetic structure among four locations within the rio Paraná basin. While we first expected that contemporary genetic structuring might be the result of isolation by distance (Wright, 1938), no significant correlation between genetic distance and geographic distance was found using either microsatellite or mitochondrial markers. Thus, geographic distance did not explain the current genetic differentiation among the population, suggesting that a stepping stone model of migration (Kimura & Weiss, 1964) may explain the population structure of the four S. hilarii populations. More intensive sampling within the upper rio Paraná basinwill be needed to test this hypothesis.
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The Botrychiopsis genus and its biostratigraphic implications in Southern Paraná Basin

The Botrychiopsis genus and its biostratigraphic implications in Southern Paraná Basin

Botrychiopsis has been considered an important floristic element of Westphalian/Artinskian associations of the Paraná Basin. The occurrence of Botrychiopsis in roof-shales of the Rio Bonito Formation in Southern Paraná Basin (Quitéria area), supported by the identification of Botrychiopsis valida, enlarges the genus biochron. Consequently, the stratigraphic hierarchy for Botrychiopsis plantiana and Botrychiopsis valida was defined for the Paraná Basin. Although it is climatically controlled and related to a deglaciation icehouse stage, stratigraphic distribution of the genus presents a substantial climate tolerance, from cold/cool to warm/temperate conditions. A new phytostratigraphic zonation is proposed for the southern portion of the basin that includes the Botrychiopsis Zone (Asselian/Kungurian), which is subdivided into the Botrychiopsis plantiana (Asselian/Artinskian) and Botrychiopsis valida (Late Artinskian/Kungurian) subzones.
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Structural analysis of clastic dikes using Structure from Motion - Multi-View Stereo: a case-study in the Paraná Basin, southeastern Brazil

Structural analysis of clastic dikes using Structure from Motion - Multi-View Stereo: a case-study in the Paraná Basin, southeastern Brazil

ABSTRACT: This work presents the development of a three-dimensional (3D) model of an outcrop of the Corumbataí Formation (Permian, Paraná Basin, Brazil) using Structure from Motion - Multi-View Stereo (SfM-MVS) technique in order to provide a structural analysis of clastic dikes cutting through siltstone layers. While traditional photogrammetry requires the user to input a series of parameters related to the camera orientation and its characteristics (such as focal distance), in SfM-MVS the scene geometry, camera position and orientations are automatically determined by a bundle adjustment, an iterative procedure based on a set of overlapping images. It is considered a low-cost technique in terms of hardware and software, also being able to provide point density and accuracy on par to the ones obtained withTerrestrial Laser Scanning. The results acquired on this research have good agreement with previous works, yielding a NNW main orientation for the dikes measured in the field and on the 3D model. The development of this work showed that SfM-MVS use and practice on geosciences still needs more studies on the optimization of the involved parameters (such as camera orientation, image overlap and angle of illumination), which, when accomplished, will result in less processing time and more accurate models. KEYWORDS: clastic dikes; structure from motion; digital outcrop model; photogrammetry; structural geology.
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Progress on the palynostratigraphy of the Permian strata in Rio Grande do Sul State, Paraná Basin, Brazil

Progress on the palynostratigraphy of the Permian strata in Rio Grande do Sul State, Paraná Basin, Brazil

A review of published papers and results of analysis of new material have allowed improvements on the palynostratigraphy of the Permian strata of the Paraná Basin in Rio Grande do Sul State. Based on first and last occurrences of certain species of pollen taxa, two palynozones are formalized, these are the Vittatina costabilis and Lueckisporites virkkiae Interval Zones, in ascending order. The Vittatina costabilis Interval Zone is subdivided into two units, in ascending order the Protohaploxypinus goraiensis and the Hamiapol- lenites karrooensis Subzones, and is recognized from the glacial (Itararé Group) and post-glacial sequence (Rio Bonito Formation and the base of the Palermo Formation). The Lueckisporites virkkiae Interval Zone occurs from the uppermost Rio Bonito Formation, through the Palermo and Irati formations, and into the Serra Alta and Teresina formations. The main characteristics and reference sections are established, as well as additional criteria to recognize biostratigraphical units, in accordance with the International Stratigraphic Guide. Palynostratigraphical correlation suggests that the Vittatina costabilis Zone concerns the Early Per- mian (early Cisuralian), while the Lueckisporites virkkiae is regarded as late Early Permian to early Middle Permian (late Cisularian to early Guadalupian).
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Life-history traits of Farlowella hahni (Siluriformes, Loricariidae) in streams of the Ivinhema River Basin, Upper Paraná Basin

Life-history traits of Farlowella hahni (Siluriformes, Loricariidae) in streams of the Ivinhema River Basin, Upper Paraná Basin

ARAI, F.K., GONÇALVES, G.G.G., PEREIRA, S.B., COMUNELLO, É., VITORINO, A.C.T. and DANIEL, O., 2010. Espacialização da precipitação e erosividade na Bacia Hidrográfica do Rio Dourados - MS. Engenharia Agrícola, vol. 30, no. 5, pp. 922-931. http://dx.doi.org/10.1590/S0100-69162010000500014. ARANTES, F.P., SATO, Y., SAMPAIO, E.V., RIZZO, E. and BAZZOLI, N., 2013. Spawning induction and fecundity of commercial native fish species from the São Francisco River basin, Brazil, under hatchery conditions. Agricultural Sciences, vol. 4, no. 8, pp. 382-388. http://dx.doi.org/10.4236/as.2013.48055. BAILLY, D., BATISTA-SILVA, V.F., ABELHA, M.C.F., KASHIWAQUI, E.A.L., FERNANDES, C.A. and CARVALHO, E.D., 2011. Relative abundance and reproductive tactics of a Loricariidae species at Saraiva Lagoon, Ilha Grande National Park, MS-PR, Brazil. Biota Neotropica, vol. 11, no. 3, pp. 171-178. http://dx.doi.org/10.1590/S1676-06032011000300014. BAUMGARTNER, G., NAKATANI, K., GOMES, L.C., BIALETZKI, A., SANCHES, P.V. and MAKRAKIS, M.C., 2008. Fish larvae from the upper Paraná River: do abiotic factors affect larval density? Neotropical Ichthyology, vol. 6, no. 4, pp. 551-558. http://dx.doi.org/10.1590/S1679-62252008000400002. BRAGA, F.M., GOMIERO, L.M. and SOUZA, U.P., 2008. Aspectos da reprodução e alimentação de Neoplecostomus microps (Loricariidae, Neoplecostominae) na microbacia do Ribeirão Grande, serra da Mantiqueira oriental (Estado de São Paulo). Acta Scientiarum. Biological Sciences, vol. 30, no. 4, pp. 455-463. http://dx.doi.org/10.4025/actascibiolsci.v30i4.301. BRAGA , F.M.S., GOMIERO, L.M. and SOUZA, U.P., 2009. Biologia populacional de Pareiorhina rudolphi (Loricariidae, Hypostominae) na microbacia do Ribeirão Grande, serra da Mantiqueira oriental, Estado de São Paulo. Acta Scientiarum, vol. 31, no. 1, pp. 79-88.
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Centromochlus britskii, new species

Centromochlus britskii, new species

Large hydroelectric dams were built in São Paulo, the most populous state of Brazil, working since in the 1960s. Those large dams had a significant impact on the rivers and fish communities in the upper rio Paraná basin. The Usina Hidrelétrica de Ilha Solteira was one of the first dams built between 1965 and 1978 in a stretch of rio Paraná between Ilha Solteira (São Paulo) and Selvíria (Mato Grosso do Sul). It is the third largest dam in Brazil, and together with its neighbor, UHE Engenheiro Souza Dias (also known as UHE Jupiá), the both dams compose the sixth largest hydroelectric complex in the world (Shibatta & Dias, 2006). During the construction of the UHE Ilha Solteira, expeditions to the area resulted in the capture of several species now considered rare (i.e, collected only during that opportunity or very few times in other places), including Apteronotus acidops Triques, 2011, Sternarchorhynchus britskii Campos-da-Paz, 2000, and Tembeassu marauna Triques, 1998. The first two species are listed as threatened on the Brazilian Red List (Brasil. MMA, 2014). During the same expeditions, the new species of Centromochlus was collected. The new species was incorrectly identified as Glanidium cesarpintoi, a poorly known species of Centromochlinae described by Ihering (1928) to the rio Mogi Guaçu, upper rio Paraná basin. The misidentification left the new species undescribed for more than 50 years. The aim of the present contribution is to describe the species as new, diagnosing it from all other Centromochlinae. In addition, comments on Centromochlus simplex are provided and its generic placement discussed.
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Inorganic carbon shortage may limit the development of submersed macrophytes in habitats of the Paraná River basin

Inorganic carbon shortage may limit the development of submersed macrophytes in habitats of the Paraná River basin

Positive influence of alkalinity on the occurrences of E. najas and E. densa were first suggested in the Paraná River basin in an investigation carried out in several reservoirs (Bini and Thomaz, 2005; Thomaz, 2006). Experiments also showed that the photosynthesis of both species responds positively to increasing alkalinity (Pierini and Thomaz, 2004). However, whether biomass accumulation of these species responds positively or not to alkalinity is still an open question. In this work we experimentally investigated the effects of carbon availability, manipulating the alkalinity, on the initial growth of E. najas and E. densa. We hypothesized that both species grow faster in higher values of alkalinity, compared to lower ones. Because the alkalinities we used are within the range obtained in several natural and artificial aquatic habitats of the Paraná basin, our results serve the purpose to test whether carbon availability limits these two species in this basin or not.
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Avaliação do potencial de geração de metano e dióxido de carbono biogênicos em Folhelhos...

Avaliação do potencial de geração de metano e dióxido de carbono biogênicos em Folhelhos...

Nomura, S.F., Sawakuchi, a. O., Bello, R.M.S., Méndez-Duque, J., Fuzikawa, K., Giannini, P.C.F., Dantas, M.S.S., 2014. Paleotemperatures and paleofluids recorded in fluid inclusions from calcite veins from the northern flank of the Ponta Grossa dyke swarm: Implications for hydrocarbon generation and migration in the Paraná Basin. Mar. Pet. Geol. 52, 107 –124. doi:10.1016/j.marpetgeo.2014.01.010 Pan, L., Xiao, X., Tian, H., Zhou, Q., Chen, J., Li, T., Wei, Q., 2015. A preliminary study on the characterization and controlling factors of porosity and pore structure of the Permian shales in Lower Yangtze region, Eastern China. Int. J. Coal Geol. doi:10.1016/j.coal.2015.05.005
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Genetic divergence between Pseudoplatystoma corruscans and

Genetic divergence between Pseudoplatystoma corruscans and

The 2-PHybr1 specimen was captured in the flood- plain of the Upper Paraná River Basin (Luz et al., 2004). In the Cuiabá River Basin, where the two species occur in sympatry, a P. reticulatum × P. corruscans hybrid was registered by Veríssimo et al. (2005). The occurrence of these hybrids in the Paraná and Manso rivers likely results from fishes escaping from farming stations. Accidental introduction of Pseudoplatystoma interspecific hybrids into a natural environment could be a threat to the ge- netic integrity of local populations due to the potential risk of backcrossing and subsequent gene introgression. This threat would be even more drastic in the Upper Paraná River Basin, where, due to geographic isolation, the P. reticulatum species does not exist naturally. Figure 5. a) Neighbor-joining; and b) maximum likelihood dendrograms, obtained with the HKY + I model, from the hy- pervariable domain of the mtDNA control region ( D-loop) haplotypes: () P. corruscans and () P. reticulatum from the northern Paraguay River sub-basin; () P. corruscans from the Upper Paraná Basin; ( ▼) P. reticulatum × P. corruscans hybrid. Numbers above branches are bootstrap values based on 1,000 replicates.
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Variação cariotípica de Astyanax bimaculatus (Linnaeus, 1758) (Pisces: Characidae) nas bacias costeiras do Brasil

Variação cariotípica de Astyanax bimaculatus (Linnaeus, 1758) (Pisces: Characidae) nas bacias costeiras do Brasil

Beurlen (1970) indicates that current drainage configuration is a rather recent feature in South American hydrology. The Paraná basin is intra-cratonic and includes very old components of the continental crust (Fúlfaro et al., 1982). During the Tertiary, and following depression of the foreland basin in the Pampas and Chaco, the Paraná basin tilted toward the west, also causing an elevation on the oriental slope of the Serra do Mar (Beurlen, 1970). In the earliest Tertiary, the upper course of the Paraná and its tributaries flew northwards to the São Francisco and Tocantins basins, turning to a southern direction due to the development of a transversal updoming during the Tertiary.
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Braz. J. Geol.  vol.46 número2

Braz. J. Geol. vol.46 número2

Manuscript ID: 20160050. Received in: 03/30/2016. Approved in: 05/15/2016 ABSTRACT: he Late Paleozoic Ice Age is recorded in the Para- ná Basin as glacial deposits, deformational features and ice-related erosional landforms of the Itararé Group. Erosional landforms are often employed to build paleogeographic models that depict the location of ice masses and paleo ice-low directions. his paper provides a review of the literature and new data on micro- to me- so-scale ice-related, erosional landforms of the Paraná Basin. Exa- mined landforms can be placed into four broad categories based on their mode of origin. Subglacial landforms on rigid substrates occur on the Precambrian basement or on older units in the Paraná Basin. hey include streamlined landforms and striated pa- vements formed by abrasion and/or plucking beneath advancing glaciers. Subglacial landforms on soft beds are intraformational surfaces generated by erosion and deformation of unconsolidated deposits when overridden by glaciers. Ice-keel scour marks are sof- t-sediment striated/grooved landforms developed by the scouring of free-loating ice masses on underlying sediments. Striated clast pavements are horizons containing aligned clasts that are abraded subglacially due to the advance of glaciers on unconsolidated de- posits. Only those erosional landforms formed subglacially can be used as reliable paleo ice-low indicators. Based on these data, the paleogeography of the Paraná Basin during the Late Paleozoic Ice Age its into a model of several glacial lobes derived from topogra- phically-controlled ice spreading centers located around the basin instead of a single continental ice sheet.
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Chromosomal evidence of population subdivision in the freshwater fish Leporinus elongatus in the Upper Paraná River basin

Chromosomal evidence of population subdivision in the freshwater fish Leporinus elongatus in the Upper Paraná River basin

Cytogenetic analysis. Twenty-eight L. elongatus specimens (17 males and 11 females) from the Mogi- Guaçú River sampled in the municipality of Pirassununga (SP) and 53 (43 males and 10 females) from the Para- napanema River collected near the municipality of Ouri- nhos (SP), both rivers belonging to the Upper Paraná basin (Southeastern Brazil), were analyzed. The chromosome preparations were obtained from anterior kidney tissue by direct tissue dissociation (Bertollo et al., 1978) or by short term culture (Fenocchio et al., 1991). The mitotic chromo- somes were submitted to C-banding (Sumner, 1972) using Giemsa staining or the 4’-6-diamidine-2-phenylindole fluorochrome (C/DAPI banding). Ag-NOR sites were stained according to Howell and Black (1980). Replication bands were obtained through the in vitro incorporation of the 5-Brdu base analogue (Giles et al., 1988).
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Bivalves permianos da fase de continentalização das bacias do Gondwana Ocidental: sistemática, paleogeografia e bioestratigrafia

Bivalves permianos da fase de continentalização das bacias do Gondwana Ocidental: sistemática, paleogeografia e bioestratigrafia

During a recent inspection in the Paleontological Collection of the Institute of Geosciences, University of São Paulo, we have identified some specimens of undescribed mollusk bivalves. These called our attention for the following reasons: a- all specimens are internal molds of conjugated and closed articulated valves, some of them presenting fragments of silicified shells; b- all internal molds have similar general shape and internal characters, representing specimens of the same taxon; c- the internal molds and silicified valves are well preserved, including fragile structures, which are hardly preserved, such as the internal mold of the external ligament and muscle scars; d- and equally important, according to the labels of all specimens, they were collected from rocks of the Passa Dois Group (Permian), Serrinha Member of the Rio do Rasto Formation. Although who collected the shells and the precise geographic location of the specimens are still unknown, the detailed study of these fossils brings us to the conclusion that they are morphologically distinct from any heretofore published genus of the endemic fauna of bivalves from Passa Dois Group. Based in its general shape, hinge structure and muscles scars, the new form can be classified under the Family Megadesmidae Vokes, 1967, the most diverse group of Permian bivalves of the Paraná Basin. The specimens are referred as Beurlenella elongatella new gen. and sp. The shell shape and taphonomy indicate that this bivalve was a shallow, rapid, active burrower, suspension feeder, probably preserved in situ, in event deposits.
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Shaking a methane fizz: Seismicity from the Araguainha impact event and the Permian –Triassic global carbon isotope record

Shaking a methane fizz: Seismicity from the Araguainha impact event and the Permian –Triassic global carbon isotope record

analog, the Black Sea. The common stratigraphy for both the Paraná and Karoo basins (Gondwana Supersequence II) and the ubiquity of shallow marine fauna such as the Mesosaurids prove that these basins were connected prior to opening of the Atlantic Ocean (Milani and de Wit, 2007). The target rock stratigraphy of the northern Paraná Basin of Brazil was studied by Lana et al. (2007, 2008) from prominent expo- sures in the uplifted and folded sedimentary rocks that form the inner- most collar and two concentric rings around the uplifted granite and impact melt at the core of the Araguainha impact structure. From bot- tom to top, the four major groups of sedimentary rocks that were affect- ed by the impact event are the Silurian–Ordovician Ivaí Group (glacial diamictites and shales), the Devonian Paraná Group (red sandstone, siltstones, and arenose conglomerates), the Carboniferous–Permian Tubarão Group (basal conglomerates, sandstones, glacial diamictites), and the Middle to Late Permian Passa Dois Group (chert-rich carbon- ates, bituminous shales, and shales).
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Assessment of sábalo (Prochilodus lineatus) fisheries in the lower Paraná River basin (Argentina) based on hydrological, biological, and fishery indicators

Assessment of sábalo (Prochilodus lineatus) fisheries in the lower Paraná River basin (Argentina) based on hydrological, biological, and fishery indicators

Habitat hydrological indicators. A comprehensive understanding of the changes that have occurred in the sábalo fishery must also take into account the hydrological conditions as they influence on the larvae abundance (Fuentes & Espinach Ros, 1998) and availability of nursery areas and recruitment (Agostinho et al., 1997; 2004; Gomes & Agostinho 1997). Between 1972 and 1999 the Paraná basin experienced extremely wet conditions, particularly during the years 1982-1983 and 1997-1998 when very strong El Niño events took place. Nevertheless, after 1999 and throughout almost a decade, the annual flooding pulses were of low intensity due to low precipitations and also due to dam regulations in the upper Paraná basin, mainly during low flow conditions (Agostinho et al., 2007; Baigún et al., 2011). In the absence of data concerning relationships between flood pulse attributes and the annual recruitment levels or the density of juveniles in the alluvial valley, simple indices such as the CCI and FCI could be used as proxies of habitat connectivity and habitat availability for larval hatching and juvenile growth, with the expectation that the fish yield would increase after pre- adult recruitment two years later. Whereas the CCI reflects the potential to connect the main channel with the floodplain and is linked to the concept of amplitude proposed by Neiff (1997) to characterize pulse attributes, the CFI is more related to water residence time. Thus, the variation in CCI and FCI values could be used as indicative of whether poor or good recruitment conditions could be expected and, accordingly, how to regulate the fishing effort during the following years. Based on these analyses we suggest as preliminary guidelines considering a CCI of 0.4 and a FCI of 0.05 as threshold values that could reduce the probabilities of overfishing scenarios as was observed during the 1999 -2009 period, when fishing pressure increased along with a reduction in the river’s flow. Such criteria, however, should be adjusted by more detailed studies based on assessing the relationship between recruitment intensity or juveniles density and flooding area and water residence time.
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Reappraisal of Rhamdia branneri Haseman, 1911 and R. voulezi Haseman, 1911 (Siluriformes: Heptapteridae) from the rio Iguaçu with notes on their morphometry and karyotype

Reappraisal of Rhamdia branneri Haseman, 1911 and R. voulezi Haseman, 1911 (Siluriformes: Heptapteridae) from the rio Iguaçu with notes on their morphometry and karyotype

The species Rhamdia branneri Haseman, 1911 and the subspecies Rhamdia branneri voulezi Haseman, 1911 from rio Iguaçu are currently recognized as synonyms of Rhamdia quelen (Quoy & Gaimard, 1824). However, recent karyotype and ecomorphology studies distinguish R. branneri and R. voulezi as different species. Examination of Rhamdia populations from rio Iguaçu, including type specimens, together with other congeners from rio Tibagi, allowed to properly reexamine the situation of these Haseman’s taxa and references given to Rhamdia in the Iguaçu. The species R. branneri and R. voulezi have strong serrae with large basis on both margins of the pectoral-fin spine, uncommon in the remaining species of Rhamdia and different from the fine serrate margins of the pectoral spine of R. quelen; a regular dorsal profile, slightly curved between supraoccipital and dorsal fin; with dorsal dark- brown or light-gray coloration along body, abdomen pale, without profuse small black spots, common in populations of the upper Paraná species and the type-material of R. quelen. Also the following morphometric characters discriminate these species: Rhamdia voulezi, adipose fin elongate; smaller distance between dorsal and adipose fin; smaller length between adipose fin to base of caudal fin and smaller distance from posterior margin of eye to opercular border. Rhamdia branneri, larger distance from dorsal and adipose fins; deeper caudal peduncle; higher trunk depth in the vertical distance through adipose, between pelvic and anal fins; larger scapular bridge; shorter maxillary barbel; shorter external mental barbel; shorter interorbital distance; shorter length of dorsal fin basis and shorter adipose-fin base length. A PCA between the populations of Rhamdia from Iguaçu and a population from rio Tibagi, upper Paraná basin, discriminates the population from Tibagi on basis of dorsal to adipose fin distance, dorsal-fin spine length, maxillary barbel length, eye diameter, and pectoral-fin spine length. This morphometric study allied to the karyotype known differences suggest R. branneri and R. voulezi as valid species. The complex state of R. quelen with the neotype recently designated from rio Samiria recommend new studies on basis of molecular genetics and provision of the names R. branneri and R. voulezi in the Iguaçu basin.
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Cytogenetics of Imparfinis schubarti (Siluriformes: Heptapteridae) from the Piumhi drainage, a diverted river in Minas Gerais State, Brazil

Cytogenetics of Imparfinis schubarti (Siluriformes: Heptapteridae) from the Piumhi drainage, a diverted river in Minas Gerais State, Brazil

The River Piumhi, a tributary of the River Rio Grande in state of Minas Gerais, Brazil, was diverted in the 1960s from the Rio Paraná basin into the São Francisco basin. During con- struction of the Furnas hydroelectric dam in the Rio Grande, a secondary dike was built in the lower course of the River Piumhi in order to raise the water volume of the Furnas Dam and to avoid the flooding of the town of Capitólio. This secondary damming required the deviation of the Piumhi from the Rio Grande drainage into the São Francisco basin (M OREIRA -F ILHO &

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BRAZILIAN ARCHIVES OF BIOLOGY AND TECHNOLOGY

BRAZILIAN ARCHIVES OF BIOLOGY AND TECHNOLOGY

Agostinho, A. A.; Vazzoler, A. E. A. M.; Pavanelli, C. S.; Abujanra, F.; Suzuki, H. I.; Júlio Jr, H. F.; Latini, J. D.; Luz, K. D. G; Bini, L. M.; Hahn, N. S.; Fugi, R.; Veríssimo, S. & Almeida, V. L. L. (1997 b), Estudos ictiológicos na área de influência do AHE Corumbá-Fase Rio. Relatório Parcial, Universidade Estadual de Maringá, Maringá, Paraná, 289p.

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