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Introduction
Publications
Publications (48)
Soundscape studies help us understand ecological processes, biodiversity distribution, anthropic influences, and even urban quality, across a wide variety of places and time periods. In this work, instead of looking for differences, we ask if there are common characteristics shared by all soundscapes. Based on our results, we propose a universal di...
The large catfish Pseudoplatystoma punctifer plays an important role as a top predator in the Amazonian Basin ecosystem. The Madeira River is the largest tributary of the Amazon River marked by a series of rapids and waterfalls. Between 2011 and 2012 some of the rapids were submerged by two hydroelectric dams. Upstream and downstream of the rapids...
The migratory catfish Brachyplatystoma vaillantii is one of the most important fishery resources in the Amazon. Intense capture occurs associated to its life cycle. In order to know the genetic status, we sequenced the mitochondrial DNA control region from 150 individuals of B. vaillantii, collected in five fishing landing locations, covering the l...
The weakly electric gymnotiform fish produce a rhythmic electric organ discharge (EOD) used for communication and active electrolocation. The EOD frequency is entrained to a medullary pacemaker nucleus. During communication and exploration, this rate can be modulated by a pre-pacemaker network, resulting in specific patterns of rate modulation, inc...
Electrosensory systems of weakly electric fish must accommodate competing demands of sensing the environment (electrolocation) and receiving social information (electrocommunication). The jamming avoidance response (JAR) is a behavioral strategy thought to reduce electrosensory interference from conspecific signals close in frequency. We used playb...
Considering the conserved nature of synaptic physiology among vertebrates, we tested the effects of three psychotropics (diazepam, doxapram, and nicotine) on Microsternarchus cf. bilineatus, measuring 10 parameters associated to the electric organ discharges rhythm and waveform before and after the administration of each drug and a control group. T...
The electric communication signals of weakly electric ghost knifefishes (Gymnotiformes: Apteronotidae) provide a valuable model system for understanding the evolution and physiology of behavior. Apteronotids produce continuous wave-type electric organ discharges (EODs) that are used for electrolocation and communication. The frequency and waveform...
Microsternarchus bilineatus is a neotropical electric fish species widely distributed in Amazonian ecosystems. This work reports the first karyotypic description of the species M. bilineatus, which presented 2n = 48 chromosomes , with a distinct karyotypic formula between the sexes: males with 21 metacentric (m)/submetacentric (sm) + 27 subtelocent...
The South American hypopomid electric fish tribe Microsternarchini includes three small species from the Upper Orinoco and Negro rivers. These are placed in monotypic genera: Microsternarchus, Racenisia and Procerusternarchus. Recent collections from tributaries in Negro, Solimões and Amazonas Basins have revealed new specimens of Microsternarchus...
A new species of electric knifefish of the genus Microsternarchus is described from the central basin of the rio Negro, Brazil. The new species is distinguished in external features from its single congener, Microsternarchus bilineatus, by the presence of a short caudal filament, a lower number of anal-fin rays, and uniform body pigmentation. Inter...
Electric fishes (Gymnotiformes) inhabit Central and South America and form a relatively
large group with more than 200 species. Besides a taxonomic challenge due to their still
unresolved systematic, wide distribution and the variety of habitats they occupy, these fishes
have been intensively studied due to their peculiar use of bioelectricity for...
Twenty-four microsatellite loci were characterized for the Pimelodidae Brachyplatystoma capapretum and tested on 26-38 individuals from the Amazon basin. The number of alleles per locus ranged from 1 to 12 with the observed and expected heterozygosity values varying from 0.02 to 0.93 and 0.08 to 0.81, respectively. Twenty-one of the loci were in Ha...
Procerusternarchus pixuna, a new genus and species of hypopomid gymnotiform, is described from several tributaries of Negro River, Amazonas State, Brazil. The new genus is included in the tribe Microsternarchini with the genera Microsternarchus and Racenisia based on a phylogenetic analysis of 41 anatomical, morphometric, meristic, and electric org...
In this study we address the genotoxicity and putative mutagenic effects of benzene (BZN) in the erythrocytes of the electric fish Apteronotus bonapartii (Gymnotiformes, Apteronotidae) using the micronucleus test (MN) and comet assay, under controlled laboratory conditions. Electric fish were collected in the Solimões River, Manaus-AM, Brazil, and...
The family Potamotrygonidae is monophyletic comprising three genera: Paratrygon Duméril, Potamotrygon Garman and Plesiotrygon Rosa, Castello & Thorson. The distribution of most species in this family is restricted to a single basin or fluvial system. Only Potamotrygon motoro, Potamotrygon orbignyi and Paratrygon aiereba are found in more than one r...
Sternopygus is a diverse genus with a geographic range that extends from Argentina to Panamá, and species distributed both east (cis-Andean) and west (trans-Andean) of the Andes. The number of valid species of Sternopygus has changed during the last three decades, with some species assigned to complexes of species based on morphological evidence. C...
A pesca na Amazônia é uma atividade que tem permitido, ao longo dos anos, a reprodução da população ribeirinha, cuja dieta tem o peixe como item principal, coisa bastante comum nas comunidades e cidades do estado do Amazonas. Apesar de ainda ser praticada, a pesca de subsistência vem sendo substituída por uma pesca comercial, com os pescadores arte...
The large catfish Pseudoplatystoma punctifer has a high commercial value in the Amazon. Fifteen polymorphic microsatellite loci were isolated and characterized in 36–39
individuals of this species sampled at the Purus river (Amazon Basin). The number of alleles per locus ranged from 2 to 18
(average 7.4), the observed heterozygosity (HO) from 0.025...
Specimens from two fish species commonly known as piraíba (Brachyplatystoma filamentosum and Brachyplatystoma capapretum) were sampled from fish landings in nine white-water river channel regions of the Brazilian Amazon. We genetically characterized these specimens, through sequencing of the mitochondrial DNA control region. Of the 337 samples coll...
The long-distance migratory catfish Brachyplatystoma rousseauxii is among the two most important commercial catfish in the Amazon region. Recent data lists this species as being affected by overfishing. Thirty polymorphic microsatellite loci were isolated and characterized in 35 individuals. The number of alleles per locus ranged from 2 to 22, with...
The South American weakly-electric knifefish (Apteronotidae) produce highly diverse and readily quantifiable electrocommunication signals. The electric organ discharge frequency (EODf), and EOD modulations (chirps and gradual frequency rises (GFRs)), vary dramatically across sexes and species, presenting an ideal opportunity to examine the proximat...
The weakly electric fish from the main channel of the Amazon river, Sternarchogiton nattereri, offers a striking case of morphological variation. Females and most males are toothless, or present only few minute teeth on the mandible, whereas some males exhibit exaggerated, spike-like teeth that project externally from the snout and chin. Androgens...
In order to address the mitochondrial phylogeny of the order Gymnotiformes within the Otophysi, two gonorynchiform genera were used to root the tree, and 15 genera from each remaining otophysan order (Cypriniformes, Characiformes, Siluriformes and Gymnotiformes) were sampled. The final data matrix consisted of two fragments (701 aligned nucleotides...
The piramutaba (Brachyplatystoma vaillantii) is one of the largest and most important migratory catfishes of the Amazon Basin. Due to its historical commercial importance,
this species is now considered overfished. Fifteen polymorphic microsatellite markers were characterized in order to be used
as tools to address aspects of the biology and conser...
Electrocommunication signals in electric fish are diverse, easily recorded and have well-characterized neural control. Two signal features, the frequency and waveform of the electric organ discharge (EOD), vary widely across species. Modulations of the EOD (i.e. chirps and gradual frequency rises) also function as active communication signals durin...
The large pimelodid, Brachyplatystoma rousseauxii, is one of the two most important catfish species for the fisheries in the Amazon. It is captured by commercial and artisanal fishing fleets in at least five Amazonian countries, at fishing grounds more than 5000 km apart. Current evidence suggests a complex life cycle that includes the longest repr...
The effects of genotoxic substances on fishes genome have been object of many studies, especially those which attempt to establish the responses of genes to environmental stimulus. The objective of this study was to evaluate the mutagenicity and genotoxicity in electric fishes of species Eingenmannia virescens, under to benzene exposure (50ppm), ut...
We used mitochondrial DNA control region sequences to examine phylogeography and population differentiation of the endangered Amazonian manatee Trichechus inunguis. We observe lack of molecular differentiation among localities and we find weak association between geographical and genetic distances. However, nested clade analysis supports restricted...
Resumo. Este trabalho relata resultados preliminares obtidos no desenvolvimento de um produto tecnológico que permitirá o monitoramento contínuo e em tempo real da qualidade da água em qualquer tipo de ambiente aquático. O sistema proposto é fundamentado nas propriedades biofísicas do campo elétrico gerado por peixes elétricos da América do Sul (Fa...
Chromobacterium violaceum is one of millions of species of free-living microorganisms that populate the soil and water in the extant areas of tropical biodiversity around the world. Its complete genome sequence reveals (i) extensive alternative pathways for energy generation, (ii) 500 ORFs for transport-related proteins, (iii) complex and extensive...
Chromobacterium violaceum is one of millions of species of free-living microorganisms that populate the soil and water in the extant areas of tropical biodiversity around the world. Its complete genome sequence reveals (i) extensive alternative pathways for energy generation , (ii) 500 ORFs for transport-related proteins, (iii) complex and extensiv...
Chromobacterium violaceum is one of millions of species of free-living microorganisms that populate the soil and water in the extant areas of tropical biodiversity around the world. Its complete genome sequence reveals (i) extensive alternative pathways for energy generation , (ii) 500 ORFs for transport-related proteins, (iii) complex and extensiv...
According to current phylogenetic theory, both electroreceptors and electric organs evolved multiple times throughout the evolution of teleosts. Two basic types of electroreceptors have been described: ampullary and tuberous electroreceptors. Ampullary-type electroreceptors appeared once in the common ancestor of the Siluriformes+Gymnotiformes (wit...
The phylogenetic relationships of both African and South American electric fish orders are reviewed at their intra-ordinal level taking into consideration recent studies in which cladistic principles have been employed. Several concordant topologies emerge from the different data sets, but some unsettled issues still remain. From the studies availa...
In this report we generate a partial phylogeny of the mormyriform fishes using mitochondrial DNA sequences from twelve species of mormyriforms belonging to five genera. Electric organs and electric organ discharges are also examined. We have sequenced and aligned 373 bases from the mitochondrial 12S rRNA and 559 bases from the 16s rRNA from fourtee...
In this report we generate a partial phylogeny of the mormyriform fishes using mitochondrial DNA sequences from twelve species of mormyriforms belonging to five genera. Electric organs and electric organ discharges are also examined. We have sequenced and aligned 373 bases from the mitochondrial 12S rRNA and 559 bases from the 16s rRNA from fourtee...
In this report we generate a partial phylogeny of the mormyriform fishes using mitochondrial DNA sequences from twelve species of mormyriforms belonging to five genera. Electric organs and electric organ discharges are also examined. We have sequenced and aligned 373 bases from the mitochondrial 12S rRNA and 559 bases from the 16s rRNA from fourtee...
In this report we generate a partial phylogeny of the mormyriform fishes using mitochondrial DNA sequences from twelve species of mormyriforms belonging to five genera. Electric organs and electric organ discharges are also examined. We have sequenced and aligned 373 bases from the mitochondrial 12S rRNA and 559 bases from the 16s rRNA from fourtee...
The order Gymnotiformes (South American electric fishes) is a fascinating assemblage of freshwater fishes that share the unusual ability to produce and sense electric fields used for electrolocation and social communication. In the last few decades, the electrogenic and electrosensory systems (EES) of these fish have served as an excellent model to...
This paper briefly reviews the genetic studies already performed in Amazon fishes and propose some methods that may be addressed to the study of genetic diversity of ornamental fishes in the region. From a suggested list of approximately 200 fish species to be traded in the aquarium industry in the Amazon, the cardinal tetra (Paracheirodon axelrodi...
