scholarly journals Mayfly diversity in the brazilian tropical headwaters of Serra do Cipó

2005 ◽  
Vol 48 (6) ◽  
pp. 983-996 ◽  
Author(s):  
Michael Goulart ◽  
Marcos Callisto
Keyword(s):  
Taxonomic Richness ◽  
Dry Period ◽  
Lotic Ecosystems ◽  
River Watershed ◽  
Rainy Period ◽  
Sao Francisco River ◽  
Serra Do Cipó ◽  
São Francisco River ◽  
Dry Seasons ◽  
Doce River

The objectives of this study were to evaluate spatial and seasonal distribution, assemblage structure and substrate associations of mayfly nymphs in five lotic ecosystems in the headwaters of the Doce River and São Francisco River watersheds, Brazil. Samples were taken in 24 sampling stations during rainy and dry seasons in 1998. In total, 7,066 organisms were collected, belonging to 27 genera and 6 families of Ephemeroptera. The dominant taxa were Americabaetis, Paracloeodes, Leptohyphes and Hagenulus. During the rainy period, the São Francisco River watershed showed higher taxonomic richness, diversity and evenness, while in the dry period, the taxonomic richness was higher in Doce River watershed. No significant differences were found in the taxonomic richness, diversity, evenness and density of mayfly assemblages between the two studied sampling periods. The results suggested that the diversity of the mayfly assemblages in tropical headwaters of Serra do Cipó would be probably due to ecosystem and watershed characteristics.

scholarly journals Environmental factors and benthic Oligochaeta (Annelida, Clitellata) assemblages in a stretch of the Upper São Francisco River (Minas Gerais State, Brazil)

2011 ◽  
Vol 71 (2) ◽  
pp. 437-446 ◽  
Author(s):  
AL Suriani-Affonso ◽  
RS França ◽  
M. Marchese ◽  
O. Rocha
Keyword(s):  
Size Composition ◽  
Abundant Species ◽  
Nitrogen And Phosphorus ◽  
Sao Francisco River ◽  
Limnodrilus Hoffmeisteri ◽  
São Francisco River ◽  
Data Variability ◽  
Numerical Abundance ◽  
Minas Gerais State ◽  
Dry Seasons

The Oligochaeta forms an important part of the macroinvertebrates inhabiting sediments of lotic ecosystems. It has an important role in the cycling of matter and energy transfer in these environments. The aim of this study is to analyse limnological variables, their influence on the structure and diversity of benthic oligochaete taxocenosis in a stretch of the Upper São Francisco River and its tributary the Piumhi River. Samples were taken in two climatic periods, the dry season in October 2006 and 2007 and the rainy season in March 2007 and 2008 at three points along the Piumhi River and six points along the São Francisco River. The sediment of the São Francisco consisted predominantly of sand and clay, whereas the sediment of the Piumhi was mainly sandy. Six species of oligochaete occurred in the Piumhi River while seven were found in the São Francisco. Of these, Pristina synclites Stephenson, 1925, Pristina americana Cernosvitov, 1937, Bothrioneurum sp. Stolc, 1888 and Limnodrilus hoffmeisteri Claparede, 1862 occurred in the sediment of both rivers. L. hoffmeisteri showed the highest numerical abundance in the Piumhi River and Brinkhurstia americana (Brinkhurst, 1964) and L. neotropicus Cernosvitov, 1939 were the most abundant species in the São Francisco River. The highest oligochaete density was recorded in the Piumhi during the dry seasons. Canonical correspondence analyses (CCA) of sediment characteristics explained most of the data variability and the association of the presence of oligochaete species in the Piumhi and São Francisco Rivers with the limnological variables (grain size composition and total nitrogen and phosphorus concentrations in the sediment).

scholarly journals Habitat diversity and benthic functional trophic groups at Serra do Cipó, Southeast Brazil

2001 ◽  
Vol 61 (2) ◽  
pp. 259-266 ◽  
Author(s):  
M. CALLISTO ◽  
P. MORENO ◽  
F. A. R. BARBOSA
Keyword(s):  
Riparian Vegetation ◽  
Aquatic Macrophytes ◽  
Mesh Size ◽  
Habitat Diversity ◽  
Trophic Groups ◽  
Macroinvertebrate Communities ◽  
Lotic Ecosystems ◽  
Serra Do Cipó ◽  
Trophic Resources ◽  
Doce River

The assessment of the diversity of habitats and the characterisation of the functional trophic groups of benthic macroinvertebrate communities of some rivers of Serra do Cipó (MG) were the main objectives of this study. The available trophic resources and the types of substrata were characterised along with the structure and composition of their using functional trophic groups. Serra do Cipó is a watershed divisor of the São Francisco and Doce River basins, including a series of streams and rivers, of good water quality and well preserved ecological characteristics. Samples were collected in Cipó, Peixe and Preto do Itambé rivers, besides the Indaiá and Capão da Mata streams at 26 sampling stations, during the rainy (February) and dry (October) seasons of 1998, using "Kicking nets" of 0.125 mm mesh size. The group of collectors (Baetidae, Leptophlebiidae and Leptohyphidae) was the most abundant, followed by collector-predators (Hydrophilidae, Ceratopogonidae, Chironomidae-Tanypodinae), and detritivorous-herbivores (Oligochaeta). The riparian vegetation, together with the aquatic macrophytes, are the substrata containing the highest richness of functional trophic groups and the higher habitat diversity. The results suggest that the use of functional trophic groups, together with habitat evaluation, are efficient tools in the evaluation of the diversity of benthic macroinvertebrates, particularly in altitudinal lotic ecosystems.

scholarly journals Biodiversity assessment of benthic macroinvertebrates along a reservoir cascade in the lower São Francisco river (northeastern Brazil)

2005 ◽  
Vol 65 (2) ◽  
pp. 229-240 ◽  
Author(s):  
M. Callisto ◽  
M. Goulart ◽  
F. A. R. Barbosa ◽  
O. Rocha
Keyword(s):  
Northeastern Brazil ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Negative Consequences ◽  
Cascade System ◽  
System Effect ◽  
Rainy Period ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Significant Difference

In order to verify the cascade-system effect in benthic macroinvertebrate communities, and the implications for policy making and proposals for conservation and sustainable use of the lower portion of São Francisco river basin (Bahia State, Brazil), a three-reservoir cascade system including two stretches downstream were studied during dry (June, 1997) and rainy (March, 1998) periods. The dominant groups found were Mollusca (Melanoides tuberculata), Oligochaeta, and Chironomidae larvae. Low Shannon-Wiener and Pielou index values were found, but with no significant difference between the sampling periods. However, density and taxonomic richness were significantly different (t(0.05; 31) = -2.1945; p < 0.05; e t(0.05; 31) = -3.0600; p < 0.01) between the sampling periods, with a reduction in the number of taxaand macroinvertebrate abundance during the rainy period. An increasing gradient in benthic macroinvertebrate community structures was noted along the reservoir cascade from the first reservoir (Apolônio Sales), followed by a decrease downstream from the third reservoir of the system (Xingó). Despite the negative consequences of rapid proliferation of dams, which have caused widespread loss of freshwater habitats, the reservoir cascade system promoted an increase in benthic macroinvertebrate diversity, due to water-quality improvement along the system.

scholarly journals Performance of water usage charge in the Nation’s domain as a water resource management tool in the São Francisco River basin

RBRH ◽  
2017 ◽  
Vol 22 (0) ◽  
Author(s):  
Leonardo Henrique Andrade Vera ◽  
◽  
Suzana Maria Gico de Lima Montenegro ◽  
Simone Rosa da Silva ◽  
◽  
...  
Keyword(s):  
River Basin ◽  
Management Tool ◽  
Financial Resources ◽  
Organic Load ◽  
Water Usage ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Load Discharge ◽  
Doce River ◽  
Paraíba Do Sul River

ABSTRACT The present work consists in a study on the performance of usage charge as a management tool in the São Francisco River Basin in the period between 2010 and 2013, according to the objectives defined by the law 9.433/97. The objectives of this study considers: assessment of user participation in the amounts billed and type of use; comparative analysis of charged and collected amounts in the basin to observe user compliance to payments; analysis of the application of financial resources obtained from the revenue particularly the actions set forth by the basin investment plan, review of the evolution of uses: withdrawal, consumption, organic load discharge to assess the influence of usage charge on the rational use of water resources and comparison of pricing mechanisms of the Paraíba do Sul river, Piracicaba-Capivari-Jundiaí rivers, Doce river and São Francisco river basins for major uses. It is noted that the compliance by users to the usage charge is increasing gradually. Even though over 91% of the payments were on time by users in 2013, the financial resources obtained and the management to employ them do not meet the actual needs for investments in the basin conservation actions. With regards to the use of water withdrawal it is not observed the effect of the usage charge. For the uses of consumption and organic load discharge, the results were minor but positive. It is recommended a review of the reference flow and parameters of charging for water resources uses, and also it is suggested a study of the mechanisms of usage charge models implemented in the Paraíba do Sul river, Piracicaba-Capivari-Jundiaí river and Doce river basins, which uses the granted and measured flows for adjustments in the usage charge model, in the São Francisco river basin. All in all, the implementation of water usage charge in the São Francisco River basin despite it being recent, it is a process that will gradually be consolidating and contributing to environmental sustainability of the basin.

scholarly journals Does Climatic Seasonality of the Caatinga Influence the Composition of the Free lists of Medicinal Plants? A Case Study

2021 ◽  
Vol 12 (1) ◽  
pp. 44-54
Author(s):  
Ernani Machado de Freitas Lins Neto ◽  
Silvana Vieira dos Santos ◽  
Washington Soares Ferreira Júnior
Keyword(s):  
Medicinal Plants ◽  
Data Collection ◽  
Rural Community ◽  
Data Collection Tool ◽  
Dry Period ◽  
Northeast Region ◽  
Rainy Period ◽  
Free List ◽  
Dry Seasons

The free list is a key data collection tool in ethnobotanical studies. For this reason, it is currently receiving a great deal of attention regarding possible methodological limitations. To this end, we aim to investigate the influence of climatic seasonality of the Caatinga ecosystem on the composition of free lists of medicinal plants provided by people from a rural community located in the northeast region of Brazil. People were asked the same trigger question (which medicinal plants do you know?), during the rainy and dry seasons. Comparing the plant lists described during both periods (68 plants), respondent salience in the rainy period was significantly higher than the dry period. However, similarities can be observed between the two lists, especially with respect to their composition and the continued importance of hortelã (Mentha sp.) and alecrim (Lippia sp.), which maintained prominent positions during the rainy and dry seasons. The general analysis of the free lists revealed that there were no significant differences due to temporality, especially in relation to plants with a higher salience value. Since these plants are found mainly in homegardens, it is possible to deduce that the daily conduct of activities in these environments is stimulating and keeping plants in homegardens active in people’s memory. However, much still needs to be investigated about the free list technique in ethnobotanical data collection, especially with regard to the influence of seasonality on stimulating seasonal diseases.

scholarly journals Pluviometric patterns in the São Francisco River basin in Minas Gerais, Brazil

RBRH ◽  
2021 ◽  
Vol 26 ◽  
Author(s):  
Dawber Batista Ferreira ◽  
Gabriela Rodrigues Barroso ◽  
Marina Salim Dantas ◽  
Karla Lorrane de Oliveira ◽  
Cristiano Christofaro ◽  
...  
Keyword(s):  
River Basin ◽  
Temporal Analysis ◽  
Minas Gerais ◽  
Monthly Precipitation ◽  
Rainy Period ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Rainfall Volume ◽  
Rainfall Patterns ◽  
Monthly Precipitation Data

ABSTRACT This work aimed to evaluate the spatial-temporal variability of precipitation in the Minas Gerais section of the São Francisco River basin, an area of substantial socio-environmental relevance for the country and which has presented recent events of water scarcity. Multivariate and non-parametric statistical analyses were applied to the monthly precipitation data from 131 pluviometric stations, covering a period from 1989 to 2018. The results indicated distinct homogeneous pluviometric regions with greater spatial variability in rainfall patterns in the southern regions of the basin. Results from the temporal analysis indicated seasonality in the rainfall patterns for all seasons, with the rainy period predominantly occurring between October and March for the entire Minas Gerais section of the São Francisco River basin. No rainfall trend was identified in 78% of the stations, with the other stations (22%) showing a trend toward a reduction in rainfall volume.

scholarly journals Does predator benefits prey? Commensalism between Corynoneura Winnertz (Diptera, Chironomidae) and Corydalus Latreille (Megaloptera, Corydalidae) in Southeastern Brazil

2006 ◽  
Vol 23 (2) ◽  
pp. 569-572 ◽  
Author(s):  
Marcos Callisto ◽  
Michael D.C. Goulart ◽  
Pablo Moreno ◽  
Rogério P. Martins
Keyword(s):  
Body Size ◽  
Minas Gerais ◽  
Southeastern Brazil ◽  
Sao Francisco River ◽  
Serra Do Cipó ◽  
São Francisco River ◽  
Minas Gerais State

Commensalism between Corydalus Latreille, 1802 (Megaloptera, Corydalidae) and Corynoneura Winnertz, 1846 (Diptera, Chironomidae, Orthocladiinae) larvae was recorded in Indaiá stream, at 1,380 m a.s.l. (Parque Nacional da Serra do Cipó, 19º-20ºS, 43º-44ºW) and in the headwaters of São Francisco river, at 1,300-1,700 m a.s.l. (Parque Nacional da Serra da Canastra, 20º00'-20º30'S, 46º15'-47º00'W), in Minas Gerais state, Brazil. Seventy eight Corydalus larvae (range 22-88 mm) were sampled: 61 in the Indaiá stream and 17 in other two streams. Twelve Corydalus larvae (22-79 mm) in the Indaiá stream and three out of 15 larvae in the headwaters of São Francisco river (38-50 mm) had Corynoneura, larvae and pupae on their gills (3rd to 6th) and a few larvae attached to the abdominal segments of larger Corydalus larvae (> 25 mm). Sixty-nine larvae of Corynoneura were found in the regurgitated material from Corydalus. It is remarkable that by attaching to larger body size predators, prey could become free from predator bouts and could also be transported by them.

scholarly journals Community structure of aquatic insects (Ephemeroptera, Plecoptera, and Trichoptera) in Cerrado streams of Paraguay, Paraná, and São Francisco river basins

2013 ◽  
Vol 13 (1) ◽  
pp. 97-107 ◽  
Author(s):  
Renato de Mei Romero ◽  
Mônica Ceneviva-Bastos ◽  
Gustavo Henrique Baviera ◽  
Lilian Casatti
Keyword(s):  
Community Structure ◽  
Aquatic Insects ◽  
Regional Differences ◽  
River Basins ◽  
Taxonomic Composition ◽  
Taxonomic Resolution ◽  
Sao Francisco River ◽  
Original Distribution ◽  
São Francisco River

We evaluated qualitatively and quantitatively the community structure of aquatic insects (Ephemeroptera, Plecoptera, and Trichoptera) in 19 streams in areas of Cerrado in the Paraguay, Paraná, and São Francisco river basins. The number of genera and taxonomic composition were compared at spatial (at the hydrographic basins level) and conservation levels (more preserved and less preserved areas). The influence of spatial and environmental factors in richness and abundance was also evaluated. The geographical distribution of Grumicha, Coryphorus, and Austrotinodes was expanded. The highest Trichoptera richness was found in the São Francisco river basin (F = 5,602, p = 0,004) and a higher number of Ephemeroptera genera occurred in the relatively less preserved sites (F = 6,835, p = 0,009). The pattern of genera distribution was different among basins (R = 0,0336, p = 0,001), but it was similar among relatively less and more preserved areas (R = -0,039, p = 0,737). These findings can be explained by the low impact level in these streams and also by the taxonomic resolution used in this study. Latitude and instream diversity were the most important factors to explain the variation in genera richness and abundance (p = 0.004 and p = 0.026, respectively). Hence, the regional differences can be attributed to spatial influences, quantity or quality of habitats and the original distribution of taxa within each basin.

scholarly journals Periphytic algae dynamics in lentic ecosystems in the Brazilian semiarid

2016 ◽  
Vol 77 (3) ◽  
pp. 495-505 ◽  
Author(s):  
R. S. Cordeiro ◽  
J. E. L. Barbosa ◽  
G. Q. Lima Filho ◽  
L. G. Barbosa
Keyword(s):  
Aquatic Macrophytes ◽  
Soluble Reactive Phosphorus ◽  
Algal Community ◽  
Aquatic Communities ◽  
Dry Period ◽  
Rainy Period ◽  
Brazilian Semiarid ◽  
High Concentrations ◽  
Reactive Phosphorus ◽  
Reduced Density

Abstract The hydrological periods drive the structure and organization of aquatic communities in semiarid regions. We hypothesize that a decrease of the precipitation during the dry period will favor the development of the periphytic algal community, leading to higher richness and density in this period. To test this hypothesis, we investigated the changes in the periphytic algal community structure in three shallow and eutrophic ecosystems of the Brazilian semiarid. The sampling was performed between 2007 and 2010 at two-mensal intervals. The sampling of periphytic algal was performed in aquatic macrophytes and rocks. The abiotic variables were analyzed simultaneously. Dominance in diatoms, cyanobacteria and chlorophytes, respectively, was observed in two periods. In the dry period, waters were alkaline and had high concentrations of nitrate and total phosphorus associated with the highest densities of Bacillariophyceae. In the rainy period the water was warmer, oxygenated and high concentrations of ammonia and soluble reactive phosphorus with diatoms remained dominant but with reduced density, while cyanobacteria and chlorophytes increased. Overall, periphytic algal community composition no responded to changes in the hydrological periods. However, the hydrological periods altered the dynamics of periphytic algal community, supported by the alternation of the most representative classes (diatoms and cyanobacteria) between the hydrologic periods. Our data suggest that the morphometric and chemical and physical characteristics of lentic aquatic ecosystems studied were more important in the dynamics of periphytic algal community than the hydrological periods and types of substrates.

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