Compartimentação Geomorfológica Da Bacia Hidrográfica Do Ibicuí, Rio Grande Do Sul, Brasil: Proposta De Classificação

Robaina, Luís Eduardo de Souza; Trentin, Romário; Bazzan, Thiago; Reckziegel, Elisabete Weber; Verdum, Roberto; Nardin, Dionara de

doi:10.20502/rbg.v11i2.148

Cited by 21 publications

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“…Geologicamente, nas áreas mais altas, os rios correm sobre rochas vulcânicas da Formação Serra Geral, e na encosta correm sobre uma mistura de rochas vulcânicas e sedimentares, as últimas representadas pelas formações Botucatu e Caturrita. Próximo à foz, predominam sedimentos aluviais (Robaina et al 2010).…”

Section: áRea De Estudounclassified

Diversidade de moluscos em riachos de uma região de encosta no extremo sul do Brasil

et al. 2013

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Moluscos de riachos de uma região de encosta, no extremo sul do Brasil (Bacia do Rio Toropi) foram inventariados através de coletas conduzidas em 40 locais, com altitudes variando entre 70 e 500 metros. Ao todo, 18 espécies foram encontradas, representadas predominantemente por gastrópodes (11 espécies, 89,5% dos indivíduos). Potamolithus catharinae e Uncancylus concentricus foram as espécies dominantes. A última espécie também foi a melhor distribuída, estando presente em 81% dos locais amostrados. Entre os bivalves, apenas a espécie asiática invasora Corbicula fluminea foi abundante, mas ocorreu em um único local de coleta. Cerca de quatro espécies foram raras, estando representadas por não mais que três indivíduos. Apenas duas espécies de Unionoida foram encontradas. A dominância e a maior diversidade de gastrópodes em relação ao registrado para bivalves reflete o substrato predominantemente cascalhoso dos riachos da Bacia do Rio Toropi. A baixa riqueza registrada na área de estudo pode ser atribuída à escassez de sedimentos finos e de macrófitas, fatores que costumam favorecer a diversidade de moluscos. Essa condição também caracteriza outros riachos do sul do Brasil.

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Section: áRea De Estudounclassified

Diversidade de moluscos em riachos de uma região de encosta no extremo sul do Brasil

et al. 2013

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“…Recently Robaina et al, (2010) established a geomorphological division of the Ibicuí Basin, composed of the Peripheral Depression, Serra Geral Plateau and the SW portion of the South-Riograndense Shield.…”

Section: Methodsmentioning

confidence: 99%

Study of the Landforms of the Ibicuí River Basin With Use of Topographic Position Index

Trentin

Robaina

2018

Rev. Bras. Geomorfol.

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Abstract:The Topographic Position Index (TPI) is an algorithm which calculates the diff erence of the elevation between a central pixel ( and the mean of the elevation of its surroundings (Z) surroundings defi ned by of a radius determined by the user. The study was developed in the Ibicuí Basin, located in the west of Rio Grande do Sul, with a surface area of 46,602.58 km², with a perimeter of 1,268.76 km and an 8th order hierarchy. The TPI analysis associated with inclination determined 08 landforms elements in the BHRI: fl at area elements, top elements identifi ed as fl at and wavy, springs, slopes and the footslopes and channel elements that can be closed or opened. Resumo:O Índice de Posição Topográfi ca (IPT) é um algoritmo que calcula a diferença de elevação entre um pixel central ( e a média dos ambientes de elevação do ambiente (Z) defi nidos por um raio determinado pelo usuário. O estudo foi desenvolvido na Bacia hidrográfi ca do rio Ibicuí, localizado no oeste do Rio Grande do Sul, com uma área de 46.602,58 km², com um perímetro de 1.268,76 km e uma hierarquia da 8ª ordem. A análise IPT associada à inclinação determinou 08 elementos de relevo no BHRI: elementos de área plana, elementos de topo identifi cados como planos e ondulados, nascentes, encostas, base da encosta e elementos de canal que podem ser fechados ou abertos.

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“…The river basin is 3 310 km 2 in extent (Paiva et al, 2000), and the lower course runs through a transition region, with a lowrelief gradient, in the foothills of the Lower Northwest Slope, in the North, and the plain of the Central Depression in the South (vieira, 1984). In this region, the river flows over the sandstones of the Botucatu and Caturrita formations (Robaina, Trentin, Bazzan, Reckziegel, Verdum & De Nardin, 2010). In general, the river and streambeds have gravel sediment on the slopes, and sand in floodplain areas (Vieira, 1984).…”

Section: Methodsmentioning

confidence: 99%

Distribución y partición aditiva de la diversidad de las comunidades de moluscos de agua dulce en arroyos del Sur de Brasil.

Martello

Hepp

Kotzian

2014

RBT

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Additive partitioning of species diversity is a promising approach for analyzing patterns of diversity in mollusk communities, especially their spatial distribution. Our aims were to assess the distribution of mollusk communities in Southern Brazilian streams, and to evaluate the partitioning of community diversity at different spatial scales. The study was carried out in the lower course of the Toropi River, one of the main tributaries of the Ibicuí River Basin, in Southern Brazil. Four microbasins were considered: Sertão da Mata, Ribeirão, Tororaipi and Chiniquá, and sampling were undertaken in autumn, April and May 2009. Six sites were sampled in each stream: two in 1 st -order segments, two in 2 nd -order segments, and two in 3 rd -order segments. All species found and the community as a whole, exhibited a clumped distribution. However, the variance-to-mean ratios for the Drepanotrema kermatoides and Heleobia bertoniana were higher than those of other species, suggesting a higher degree of aggregation. The additive partitioning of the species richness showed that the observed richness at smallest scale (α=within streams) represented 20.7%, and among-streams (β 1 ) represented 10.5% of the total richness. The richness and Shannon diversity index observed at the alpha scale, were higher than those observed at the first level of beta diversity scale (β 1 =among-streams). The interaction between passive dispersal, tolerance to changes in some environmental variables, abiotic factors, and clumped distribution might have determined the spatial distribution of the communities studied. The greatest variation at the larger scales of analysis, involving among-orders and among-microbasins (β2 and β3, respectively) components, was expected, considering that the increase in distance leads to greater differences in richness (higher beta diversity). In conclusion, our results showed that the clumped distribution influenced the partition of the diversity of the mollusk communities in the streams studied. Dispersal methods and tolerance to variations in abiotic factors also have important roles in determining high alpha diversity. The partitioning of diversity showed that to preserve limnetic mollusks, it is important to preserve local areas, i.e., streams. Accordingly, conservation of streams on a local scale will contribute to conservation of the entire basin and maintenance of regional diversity (gamma). Rev. Biol. Trop. 62 (1): 33-44. Epub 2014 March 01.Key words: distribution, Neotropics, spatial scale, beta diversity, clumped.Species diversity in an area is important for examining many important questions in ecology as well as for the development of management actions for conserving biodiversity (Engen, Saether, Sverdrup-Thygeson, Grotan & Odegard, 2008). However, spatial patterns of species diversity change over multiple scales (Collier & Clements, 2011). The pattern observed within a local community might be very different from these found over broader areas such as landscapes or regions (Crist, Veech, Ger...

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Compartimentação Geomorfológica Da Bacia Hidrográfica Do Ibicuí, Rio Grande Do Sul, Brasil: Proposta De Classificação

Cited by 21 publications

References 1 publication

Diversidade de moluscos em riachos de uma região de encosta no extremo sul do Brasil

Diversidade de moluscos em riachos de uma região de encosta no extremo sul do Brasil

Study of the Landforms of the Ibicuí River Basin With Use of Topographic Position Index

Distribución y partición aditiva de la diversidad de las comunidades de moluscos de agua dulce en arroyos del Sur de Brasil.

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