The influence of environmental factors on the distribution Ephemeroptera, Plecoptera and Trichoptera (EPT) immatures was investigated in streams Brazilian Center-West (Serra do Pireneus, Pirenópolis, State Goiás). insects were sampled by lifting stones front a sieve (0.5 mm mesh) then removing from both stone sieve. Sampling carried out for 1 h at 5 collection sites over period 14 months. Air water temperature (degrees C), velocity (m/s), discharge (m(3)/s), electric conductivity...

An understanding of the interactions among local environmental factors (e.g., physical habitat and water quality) aquatic assemblages is essential to conserve biodiversity in tropical subtropical headwater streams. We evaluated relative importance multiple chemical variables that influence richness Ephemeroptera, Plecoptera, Trichoptera (EPT) wadeable Brazilian Cerrado (savanna) sampled macroinvertebrate quantified 79 randomly selected sites 2 basins southeastern Brazil. The by regression...

This work analyses the attributes of phytoplankton community (species richness, biovolume, diversity, equitability, abundance, dominance and size structure) associated with some physical, chemical climatic variables floodplain lakes Araguaia River, central Brazil, in rainy dry seasons 2000 2001. The 2001 presented different limnological characteristics between periods high low water. comprised 292 taxa, mainly Chlorophyceae nanoplankton. In both years, functional group Y (Cryptophyceae) was...

The diversity and structure of Ephemeroptera, Plecoptera Trichoptera (EPT) assemblages in streams Central Brazil (Serra dos Pireneus, Pirenópolis, State Goiás) was investigated. Abundance data EPT were obtained Central-West Brazilian order to evaluate the effect spatial variability, including size stream anthropic action, seasonality (dry rainy seasons) on faunal structure. immatures collected with circular sieves (0. 5 mm mesh) during one hour at five collection stations over 14 months....

Abstract Declines in anuran populations worldwide are increasingly creating demands for quick and urgent strategies to maximize efforts conserve amphibian populations, especially areas which few detailed data on diversity, abundance distribution available, such as the Cerrado of Central Brazil. We used extent occurrence 105 species Anura (Amphibia) region establish a regional system potential that preserves all region, at macroecological scale. The final network, obtained using simple...

The primary purpose of this study was to compare different lagoons from eight floodplains in South America (Amazon, the Upper Parana, Middle Mogi- Guacu, Araguaia, Pantanal, Sao Francisco and Orinoco floodplains). Secondly, effect water level upon selected limnological variables (important frequently used studies) evaluated. Data were obtained published articles dissertations. Some unpublished data Amazon Araguaia also used. Despite general differences among such as climate, geology...

This paper presents the dynamic modeling and digital control of a single-stage isolated current rectifier with power factor correction based on integration full-bridge flyback converters. converter is designed to operate adjustable output voltage so that it can in two distinct operation modes, depending input voltages. Therefore, small-signal state-space average models are obtained for operating step-down step-up analysis design system included different points. Experimental results 3-kW...

Macroinvertebrates are important for processing leaf detritus in temperate streams, but studies about their role tropical streams often present conflicting results. Via digestive tract analyses, we assessed the diets of Phylloicus sp. larvae (Trichoptera: Calamoceratidae), collected from two southeastern Brazil river basins (Araguari, São Francisco). We classified gut contents as coarse particulate organic matter (CPOM), fine (FPOM), algae, animal tissue, vascular plant tissue and mineral...

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Normal 0 21 false MicrosoftInternetExplorer4 Foi realizado o biomonitoramento da qualidade de água utilizando os macroinvertebrados bentônicos, através do uso uma adaptação regional metodologia BMWP " Biological Monitoring Working Party Score System '', tendo como referencia a Bacia Hidrográfica rio Meia Ponte-GO, que relacionou as características físico-químicos e freqüência ocorrência dos organismos bentônicos em nível família. Considerando novos scores '' estabelecidos para famílias...

Relationships among some abiotic factors (temperature, velocity, tlow, conductivity, oxy-reduction potential and pl-l) the seazonal density ofbenthic insects (immature forms) of lhe orders Ephemeroplera, Plecoplera Trichoptera at Parque Ecológico de Goiânia, Goiás are studied.An area 1m 2 was sampled were recorded in 4 sites fram August/I994 to July/1995.The faunistic composition 75% Ephemeraplera, 1% Plecoptera 24% Trichoplera.The data suggest water velocity tlow as 11lain faclors that...

The relationship between the aquatic macrophyte cover in upper segments of tributaries and this these but near reservoir's main body was tested. Sixteen taxa belonging to 12 families macrophytes were recorded Cachoeira Dourada Reservoir. most frequent species Eichhornia azurea (frequency occurrence = 92%; n 37 sites) E. crassipes (44%). Upper areas colonized by macrophytes. positive lower indicates importance dispersion colonization arms body.

In this paper the spatial distribution of Plecoptera nymphs in Almas' River basin, Pirenópolis, GO, was studied. Two Surber samples, each comprising 20 sampling units and totalling 2 m², were taken 13 stations, one during rainy season (January 1994) second dry (July 1994). 5 these monthly samplings made from June 1993 to July 1994; these, temperature, velocity, discharge, electrical conductivity pH measured. Regional rainfall also obtained. To ascertain habitat, a separate sample taken. Of...

The relationship among environmental factors, such as temperature, velocity, flow, conductivity, pH, vegetation cover, stream order, precipitation, and human influence was studied in terms of their effects on the spatial temporal distribution abundance trichopteran larvae streams Pireneus mountains Goiás State, Brazil. Samples were collected over one year. Canonical correspondence analysis suggested that cover order main determining factors concerning distribution. effect rainfall not same...

This study was conducted in the Meia Ponte River basin, which is located Cerrado biome. The objective to describe structure of fish assemblages and evaluate results with regard position tributaries (sampling stations) along basin. basin drains 35 municipalities Goiás State. Springs are district Itauçu (GO), Serra dos Brandões. Two sampling were conducted, one rainy season (March/2001) another dry (August/2001). Thirty sites channel River, its upper course, selected capture dipnets (3 mm...

Estudos envolvendo bacias hidrográficas raramente abordam os impactos gerados pelas atividades humanas em utilizadas como mananciais de abastecimento. As ações relacionadas à urbanização, industrialização e agropecuária, sem o planejamento adequado, são as que mais comprometem serviços ambientais tais bacias. No município Araras (SP), assim ocorreu para todo

Abstract Understanding how differences in intensity and frequency of hydrological disturbances affect the resistance resilience aquatic organisms is key to manage systems a fast‐changing world. Some insects have strategies that improve permanence (resistance), while others use favor recolonization (resilience). Therefore, we carried out manipulative experiment understand influence functional characteristics their against streams biodiversity hotspot Cerrado Brazil. We placed 200 artificial...

The tàunal composition 01' lhe Hydropsychidae (Trichoptera) Pedregulho Stream is presented.Feeding habits of larvae and behavioural aspects both adults are described.

The aim of this study was to identify and classify the lake systems Araguaia River floodplain. area extends from Aruana, State Goiás, Luiz Alves, along 256 km. A total 293 lakes were identified grouped in ten categories: abandoned channel lakes, linked channels, oxbow, filled oxbows, composite formed on meander scrolls, scrolled floodplain, by lateral accretion, blocked valleys embankment lakes. main objective characterize morphometric parameters for 20 middle plain compare different values...