scholarly journals Evaluation of Mansonia spp. Infestation on Aquatic Plants in Lentic and Lotic Environments of the Madeira River Basin in Porto Velho, Rondônia, Brazil

2021 ◽  
Vol 37 (3) ◽  
pp. 143-151
Author(s):  
Luiz H. Soares Gil ◽  
Cecilia F. Mello ◽  
Júlia Dos S. Silva ◽  
Juliana Da S. Oliveira ◽  
Shayenne Olsson Freitas Silva ◽  
...  
Keyword(s):  
River Basin ◽  
Aquatic Plants ◽  
Eichhornia Crassipes ◽  
Environmental Changes ◽  
Abiotic Factors ◽  
Larval Density ◽  
Organic Matter Content ◽  
Madeira River ◽  
Lotic Environments ◽  
Madeira River Basin

ABSTRACT The females of Mansonia are voraciously hematophagous. The spiracular apparatus of the immature, larval, and pupal forms is adapted to perforate submerged aquatic vegetation, from whose aeriferous aerenchyma they obtain the oxygen necessary for breathing. The proliferation of aquatic plants, in some cases linked to anthropic modifications that reduce water flow and/or increase organic matter content, may therefore contribute to the spread of these mosquitoes. This study aims to assess the presence of immature individuals of Mansonia in different aquatic plants of the Madeira River basin in 10 lentic and lotic environments and correlate their population density with abiotic factors such as water pH, dissolved O2, conductivity, and temperature. The sampling lasted from February 2016 to June 2018, a 29-month period during which 31,287 specimens belonging to the genus Mansonia were captured. Of the 12 species of macrophytes inspected, Eichhornia crassipes made up 70.1% of the samples. Lentic environments accounted for 58.9% of the samples and lotic environments for 41.1%. Immature individuals were most commonly found on Eichhornia crassipes, with this plant accounting for an average of 96.2% of all individuals, with a percentage ranging between 58.2% and 77.1% in different breeding areas. Only at the Foz do Igarapé Jirau site was a different distribution observed, with the number of aquatic plants more nearly equal: 83.3% of the larvae were found in Eichhornia crassipes, 9.2% in Ceratopteris pteridoides, 3.6% in E. azurea, 2.0% in Salvinia sp., and 1.9% in Pistia sp. The greatest richness was found in Iguapé do Raul. Concerning the larval/plant relationship, although less frequent, E. azurea had a higher larval density of Mansonia spp. It is important to emphasize that this finding may indicate a possible selection for this plant. Egg deposition by Mansonia spp. was more abundant in sample areas with Eichhornia crassipes and Pistia sp. The number of specimens collected was positively correlated with temperature, pH, and conductivity. These correlations showed a marked increase in the rainy season. Therefore, we were able to establish preliminary parameters of how environmental changes influence the ecology of this important genus of mosquitoes, the species of which are critical disease vectors.

scholarly journals A description of mercury in fishes from the Madeira River Basin, Amazon, Brazil

2008 ◽  
Vol 38 (3) ◽  
pp. 431-438 ◽  
Author(s):  
Wanderley Rodrigues Bastos ◽  
Mauro de Freitas Rebelo ◽  
Márlon de Freitas Fonseca ◽  
Ronaldo de Almeida ◽  
Olaf Malm
Keyword(s):  
Body Weight ◽  
River Basin ◽  
Fish Species ◽  
Temporal Trends ◽  
Migratory Fish ◽  
Madeira River ◽  
Interspecies Variability ◽  
Total Hg ◽  
Madeira River Basin ◽  
Hg Accumulation

Over the last 20 years several projects carried on the Madeira River basin in the Amazon produced a great amount data on total Hg concentration in different fish species. In this paper we discuss temporal trends in Hg contamination and its relation to body weight in some of those fishes, showing that even within similar groups, such as carnivorous and non-migratory fish, the interspecies variability in Hg accumulation is considerable.

scholarly journals Fish, Marmelos Conservation Area (BX044), Madeira River basin, states of Amazonas and Rondônia, Brazil

Check List ◽  
2007 ◽  
Vol 3 (4) ◽  
pp. 291 ◽  
Author(s):  
Mauricio Camargo ◽  
Tommaso Giarrizzo
Keyword(s):  
River Basin ◽  
Fish Species ◽  
Ecological Assessment ◽  
Aquatic System ◽  
Species List ◽  
Conservation Area ◽  
Madeira River ◽  
Northern Brazil ◽  
Rapid Ecological Assessment ◽  
Madeira River Basin

The present study provides a species list of fish from the Marmelos River Area – BX044 in the states of Amazonas and Rondônia in northern Brazil. During a Rapid Ecological Assessment (REA) performed in October and November of 2003, 133 fish species from six orders and 24 families were recorded. The most diverse families were Characidae (47 species), Cichlidae (15 species), Loricariidae (12 species) and Pimelodidae (7 species). 23 fish species were common to the entire river basin and 4 were endemic to the aquatic system studied.

scholarly journals Jatuarana fishing dynamics Brycon amazonicus (Spix & Agassiz, 1829) of the upper and middle Madeira River Basin

2018 ◽  
Vol 40 (1) ◽  
pp. 34591 ◽  
Author(s):  
Daiana Mendes Ayala ◽  
Maria Alice Leite Lima ◽  
Marília Hauser ◽  
Carolina Rodrigues da Costa Doria
Keyword(s):  
River Basin ◽  
Madeira River ◽  
Madeira River Basin

scholarly journals Crop domestication in the upper Madeira River basin

2016 ◽  
Vol 11 (1) ◽  
pp. 193-205 ◽  
Author(s):  
Charles Roland Clement ◽  
Doriane Picanço Rodrigues ◽  
Alessandro Alves-Pereira ◽  
Gilda Santos Mühlen ◽  
Michelly de Cristo-Araújo ◽  
...  
Keyword(s):  
River Basin ◽  
State Of The Art ◽  
The State ◽  
Capsicum Frutescens ◽  
Crop Domestication ◽  
Peach Palm ◽  
Capsicum Baccatum ◽  
Hot Peppers ◽  
Madeira River ◽  
Madeira River Basin

Abstract Most native Amazonian crops were domesticated in the periphery of the basin. The upper Madeira River basin is an important part of this periphery where several important crops were domesticated and others are suspected to have been domesticated or arrived early. Some of these crops have been reasonably well studied, such as manioc, peanut, peach palm, coca and tobacco, while others are not as well known, such as the hot peppers Capsicum baccatum and C. frutescens, and still others need confirmation, such as cocoyam and annatto. We review the information available for manioc, peach palm, Capsicum, peanut, annatto and cocoyam. The state-of-the-art for Capsicum frutescens, annatto and cocoyam is insufficient to conclude definitively that they were domesticated in the upper Madeira, while all the others have at least one of their origins or centers of diversity in the upper Madeira.

scholarly journals Age and growth of the Amazonian migratory catfish Brachyplatystoma rousseauxii in the Madeira River basin before the construction of dams

2018 ◽  
Vol 16 (1) ◽  
Author(s):  
Marília Hauser ◽  
Carolina R. C. Doria ◽  
Larissa R. C. Melo ◽  
Ariel R. Santos ◽  
Daiana M. Ayala ◽  
...  
Keyword(s):  
River Basin ◽  
Amazon Basin ◽  
Growth Parameters ◽  
Growth Patterns ◽  
Age And Growth ◽  
Growth Rings ◽  
Madeira River ◽  
Lower Maximum ◽  
Future Evaluation ◽  
Madeira River Basin

ABSTRACT The goliath catfish Brachyplatystoma rousseauxii has crucial economical and ecological functions in the Amazon basin. Although its life history characteristics have been studied in the Amazon, there is little information in the Madeira River basin, which holds genetically distinct populations and where dams were recently built. Using fish collected in Bolivia, Brazil and Peru, this study provides a validation of growth rings deposition and details the growth patterns of B. rousseauxii in the Madeira before the dams’ construction. Age structure and growth parameters were determined from 497 otolith readings. The species exhibits two growth rings per year and sampled fish were between 0 and 16 years old. In the Brazilian portion of the basin, mainly young individuals below 5 years old were found, whereas older fish (> 5 years) were caught only in the Bolivian and Peruvian stretches, indicating that after migrating upstream to reproduce, adults remain in the headwaters of the Madeira River. Comparing with previous publications, B. rousseauxii had a slower growth and 20 cm lower maximum standard length in the Madeira River than in the Amazon River. This study provides a baseline for future evaluation of changes in population dynamics of the species following dams closure.

scholarly journals Catfishes of the genus Auchenipterichthys (Osteichthyes: Siluriformes: Auchenipteridae): a revisionary study

2005 ◽  
Vol 3 (1) ◽  
pp. 89-106 ◽  
Author(s):  
Carl J. Ferraris Jr. ◽  
Richard P. Vari ◽  
Sandra J. Raredon
Keyword(s):  
River Basin ◽  
River Basins ◽  
Junior Synonym ◽  
Amazon River ◽  
Amazon River Basin ◽  
Orinoco River ◽  
Negro River ◽  
Madeira River ◽  
Fourth Species ◽  
Madeira River Basin

The Neotropical auchenipterid catfish genus Auchenipterichthys is reviewed and found to include four species. Auchenipterichthys thoracatus, formerly considered to be widely distributed throughout the Amazon River basin, is found to be restricted to the upper Madeira River basin. The widespread Amazonian species that had been misidentified as A. thoracatus is, instead, A. coracoideus; a species that also occurs in the upper Essequibo River. Auchenipterichthys longimanus, the most widely distributed species of the genus, is found through much of the Amazon and Orinoco River basins. The fourth species of the genus, A. punctatus (and its junior synonym A. dantei), is found in the upper portions of the Orinoco and Negro River basins in Venezuela and the central portions of the Amazon River basin in Brazil. All four species of Auchenipterichthys are redescribed and illustrated, and a key to the species is provided.

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