• Home
  • Valter Monteiro de Azevedo-Santos
Valter Monteiro de Azevedo-Santos

Valter Monteiro de Azevedo-Santos

About

59
Publications
86,400
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,253
Citations

Publications

Publications (59)
Technical Report
Full-text available
Nota de repúdio contra o Projeto de Lei 614, de 2018, da Assembleia Legislativa do Estado de São Paulo, que dispõe sobre a pesca, o embarque, o transporte, a comercialização e o processamento dos tucunarés Cichla spp. e dá outras providências. A comunidade científica, representada por doutores, mestres, pesquisadores, biólogos, engenheiros de pesca...
Article
We examined advertisements for fishing nets and surveyed the mesh sizes and chemical compositions of the nets offered for sale by two major online markets in Brazil: AliExpress and Mercado Livre. Here, we discuss the ways in which this unregulated commerce facilitates illegal fishing and impacts biodiversity, and we provide suggestions for regulati...
Article
Full-text available
Trindade, P.A.A., J.S. Araújo, V.M. Azevedo-Santos, F.W. Keppeler, T. Giarrizzo & P.M. Fearnside. 2022. Guerra serve de desculpa para destruição da Amazônia. Amazônia Real, 09 de junho de 2022. https://amazoniareal.com.br/guerra-serve-de-desculpa-para-destruicao-da-amazonia/
Article
Full-text available
The Neotropical region hosts 4,225 freshwater fish species, ranking first among the world’s most diverse regions for freshwater fishes. Our NEOTROPICAL FRESHWATER FISHES data set is the first to produce a large-scale Neotropical freshwater fish inventory, covering the entire Neotropical region from Mexico and the Caribbean in the north, to the sout...
Poster
Full-text available
This topic, “Plastic pollution in marine and freshwater biota”, will provide an update on plastic pollution and its consequences on aquatic ecosystems, with a particular focus on biological domains. Papers dealing with the origin, fate and effects of plastics in marine and freshwater environments, and their interactions with their biotic components...
Article
During recent field studies in the upper Rio Paraná basin, southeastern Brazil, a small undescribed trichomycterine catfish with interstitial habits was found. The combination of morphological character states exhibited by this species did not allow placement to any genus from eastern South America. A multigene phylogeny here performed strongly sup...
Article
Full-text available
We investigated spatial and temporal variations in the distribution of fish eggs and larvae in the Guareí River, a free-flowing tributary located in the upper section of the Jurumirim Reservoir, Paranapanema River, Brazil. Fish eggs and larvae were sampled ~ fortnightly from November 2017 to March 2018 (Cycle 1), and from November 2018 to March 201...
Article
Full-text available
Ghost nets constitute a serious threat to aquatic biodiversity, because they entangle animals as long as they persist in the environment. However, scientific literature in Brazil is virtually silent about this issue in inland ecosystems. Concerned with this gap, we conducted searches on YouTube BR to gather information about ghost nets in Brazilian...
Article
Aquaculture has tremendous importance in providing food for a growing world population. Nevertheless, unsustainable aquaculture causes nutrient build-up and favors biological invasions in natural habitats, demanding strategies to regulate such activity and therefore minimize environmental risks. Contrary to these concerns, the Brazilian Government...
Article
Full-text available
Mining activities have significantly affected the Neotropical freshwater ichthyofauna, the most diverse in the world. However, no study has systematized knowledge on the subject. In this review, we assembled information on the main impacts of mining of crude oil, gold, iron, copper, and bauxite on aquatic ecosystems, emphasizing Neotropical freshwa...
Article
Abandoned, lost, or otherwise discarded fishing gear (ALDFG) is responsible for the entanglement of several marine species. Based on a search of digital media (i.e., Google and YouTubeBR), we assessed the negative im- pacts of ghost nets—a type of ALDFG—on Brazilian marine biodiversity. We found that ghost nets negatively affected crustaceans, fi...
Article
Full-text available
The Tocantins-Araguaia Basin is one of the largest river systems in South America, located entirely within Brazilian territory. In the last decades, capital-concentrating activities such as agribusiness, mining, and hydropower promoted extensive changes in land cover, hydrology, and environmental conditions. These changes are jeopardizing the basin...
Article
Full-text available
The length-weight relationship (LWR) and diet of a small trichomycterid catfish, Cambeva guareiensis, was studied based on 58 specimens captured in Corrente stream, Guareí River basin, São Paulo, Brazil. LWR analyses showed values of a ranged from 0.0097 to 0.0149 and b from 2.858 to 3.250. The analysis of the diet showed that high amounts of aquat...
Article
Full-text available
Plastics are dominant pollutants in freshwater ecosystems worldwide. Scientific studies that investigated the interaction between plastics and freshwater biodiversity are incipient, especially if compared to the marine realm. In this review, we provide a brief overview of plastic pollution in freshwater ecosystems around the world. We found evidenc...
Article
Full-text available
In 2021 the countries of the world will discuss a framework under the Convention on Biological Diversity (CBD) for a new environmental agenda for the next 10 years (“post-2020”). Parties should consider Brazil to be a central nation in these discussions. The country holds a large freshwater biodiversity that needs to be conserved, but current polic...
Article
Full-text available
The pollution of Brazilian freshwater ecosystems by plastic began to appear in the scientific literature only in this century. We provide herein reports of plastic ingestion by members of the ichthyofauna in the Paraíba do Sul River basin. Our study area comprised the Simplício Hydroelectric Complex, located in the middle section of the Paraíba do...
Article
Full-text available
Albinism has been recorded in Neotropical freshwater fishes, mostly for nocturnal or cryptobiotic species. We report herein a case of albinism in the catfish Cambeva guareiensis (Trichomycteridae) from the Guareí River basin, Upper Paraná River basin, southeastern Brazil. The albino fish was caught with seven individuals with typical color pattern...
Article
Full-text available
The Guareí River is a tributary of the Paranapanema River (Brazil), located in the upper portion of the Jurumirim Reservoir. Fish fauna studies in this watershed began in the 2000s, but they were restricted to a few waterbodies. This work conducted a broad survey of the fish fauna in tributary streams and the main channel of the Guareí River. Sampl...
Article
Full-text available
This is the first study to report the plastic ingestion by Prochilodus lineatus in Brazilian fluvial ecosystems. We examined 32 individuals collected in two contrasting lotic environments: the highly polluted Tietê River and its much less degraded tributary, Peixe River. Most individuals, 71.88%, contained plastic in their digestive tract, with ave...
Article
Full-text available
Construction of water diversions is a common response to the increasing demands for freshwater, ofte resulting in benefits to communities but with the risk of multiple environmental, economic, and social impacts. Water-diversion projects can favor massive introductions and accelerate biotic homogenization. This study provides empirical evidence on...
Article
Full-text available
Brazil has a variety of aquatic ecosystems and rich freshwater biodiversity, but these components have been constantly damaged by the expansion of unsustainable activities. An array of different conservation strategies is needed, especially the creation of protected areas (PAs, hereafter). However, Brazil's PAs are biased towards terrestrial ecosys...
Article
Full-text available
The Rio Sapucaí basin, in Minas Gerais State, Brazil, is one of the many watersheds of the upper Rio Paraná system. Ichthyofauna surveys in this basin, in general, are scarce. In addition, small rivers and streams of the region have been targets of anthropogenic actions (e.g., pollution) – which suggest that more ichthyological studies must be perf...
Article
Full-text available
A new species of Moenkhausia is described from the upper rio Tocantins basin, States of Goiás and Tocantins, Brazil. Moenkhausia goya, new species, can be distinguished from its congeners by the shape of the humeral blotch in combination with a uniform dark pigmentation covering the interradial membranes of the dorsal and anal fins. Among congeners...
Article
Full-text available
The Paranapanema River is a major tributary of the upper Paraná river basin. Eleven hydropower dams regulate its main course, but no study has investigated fish diversity in these impoundments at the basin-scale. The present study investigated spatial patterns of richness, composition, and abundance of native (non-migratory and migratory) and non-n...
Article
Full-text available
Most of the world’s fish fauna is suffering from different types of human impacts and new conservation tools are required. The fish diet analysis is a tool that has been used to evaluate degradation processes of aquatic environments, however, few long-term studies are performed by several reasons (e.g., lack of funding, opportunity). Our aim was to...
Article
Full-text available
The Ribeirão Frutal basin is located within the upper Rio Paraná system, in the Frutal municipality, Minas Gerais State, Southeastern Brazil. Until now, there was no complete ichthyological survey published for this small basin. Therefore, here we provided a list of fish species from the Ribeirão Frutal and some of its tributaries. We found 31 spec...
Article
Full-text available
Taxonomy is a scientific discipline that has provided the universal naming and classification system of biodiversity for centuries and continues effectively to accommodate new knowledge. A recent publication by Garnett and Christidis [1] expressed concerns regarding the difficulty that taxonomic changes represent for conservation efforts and propos...
Article
Here the length–weight relationships (LWRs) of two catfish species are provided. Individuals of Imparfinis mirini Haseman, 1911, and Phenacorhamdia tenebrosa (Schubart, 1964) were collected in August and December 2017 from the Guareí River Basin, upper Paraná River basin, Brazil. Values of b were between 2.66 and 3.11 and a between 0.0122 and 0.013...
Article
The Convention on Biological Diversity proposed the Aichi Biodiversity Targets to improve conservation policies and to balance economic development, social welfare, and the maintenance of biodiversity/ecosystem services. Brazil is a signatory of the Aichi Biodiversity Targets and is the most diverse country in terms of freshwater fish, but its nati...
Article
Full-text available
Informal sales of large-bodied non-native aquarium fishes (known as “tankbusters”) is increasing among Brazilian hobbyists. In this study, we surveyed this non-regulated trade on Facebook® from May 2012 to September 2016, systematically collecting information about the fishes available for trading: species, family, common/scientific names, native r...
Article
Here the length–weight relationships (LWR, hereafter) of Pareiorhina pelicicei, Trichomycterus candidus, T. pirabitira, and T. piratymbara are provided. Samples of each species were collected between April and July 2017 with a hand net (1.5 mm mesh) in three sites from the upper Paraná River basin, Southeastern Brazil. These results increase knowle...
Article
Full-text available
The executive and legislative branches of Brazilian government have either proposed or taken a variety of initiatives that threaten biodiversity and ecosystems. Opposition by the scientific community has largely been ignored by decision-makers. In this short essay, we present recent examples of harmful policies that have great potential to erode bi...
Article
Neotropical freshwater fishes are the most diverse on the planet (>5,500 species), although nations in Latin America have been negligent regarding their conservation. National policies have historically encouraged unsustainable practices, and recent decades have witnessed a sharp increase in harmful activities. Our aim with this review was to expos...
Article
Full-text available
Moenkhausia currently comprises 90 valid species and represents one of the very species-rich genera in Characidae. Most of these species need to be revised since their original descriptions are out-of-date and are uninformative. In this sense, Moenkhausia megalops is redescribed based on the examination of the holotype and additional specimens from...
Article
Full-text available
Here we extend a discussion initiated by Toussaint et al. (Sci Rep 6:22125, 2016) concerning the relationship between global patterns of freshwater fish functional diversity (FD) and its vulnerability to human impacts. Based on a set of morphological traits, they concluded that Neotropical freshwater fishes have highest FD, but low vulnerability gi...
Article
Full-text available
Recently, the Governor of Amazonas State (Brazil) sanctioned the law 79/2016, which allows the aquaculture with non-native fishes (e.g., tilapia) in Amazonian aquatic ecosystems. Here, we argue that this law will increase propagule pressure and successful invasion events in the megadiverse Amazon River system – threatening aquatic biodiversity. We...
Article
Full-text available
Zika, chikungunya, yellow fever, and dengue are mainly transmitted to humans through Aedes mosquitoes. In attempts to control these diseases, governments and the public have encouraged the use of fish predators to control mosquito populations. However, the efficacy of using these predators for mosquito-population control is largely unproven and dub...
Article
Full-text available
A new species of the genus Moenkhausia is described from the Içá River, Amazon Basin. Moenkhausia britskii sp. n. is most similar to M. grandisquamis and M. xinguensis. From these two species it is readily distinguished by the pigmentation pattern of the humeral spot. Moenkhausia britskii further differs from M. xinguensis by the pattern of radii o...
Article
Full-text available
Oil exploitation poses a significant threat to freshwater biodiversity, and future plans to develop petroleum leases in the Amazon Basin should be seem with caution. A series of oil spills have significantly affected biodiversity and human activities in some Amazonian basins, indicating that disturbances by petroleum activities will increase in the...
Article
Moenkhausia venerei is described from the rio Araguaia, Mato Grosso, Central Brazil. The new species differs from its congeners, except M. collettii and M. copei, by the combination of the following characters: a longitudinal dark band extending from the tip of the snout to the base of caudal fin; a dark line along the base of the anal fin; and a c...
Article
Aedes Aegypti , a mosquito native to Africa, has recently transmitted zika, chikungunya, and dengue to humans in Brazil ([ 1 ][1]). In response, several Brazilian municipalities have encouraged the use of non-native “mosquito fish” ( Poecilia spp.) to control A. aegypti by eating their larvae
Article
Full-text available
In Brazil, the introduction of non-native fish is commonplace, and the only existing measure to address this problem is the normative approach (i.e., laws and inspections). However, this approach has failed to control or prevent introductions because enforcing laws in a country the size of a continent, where inspections and monitoring are minimal o...
Article
Full-text available
The Brazilian water crisis linked to climate change has led the government to take drastic measures (“Drought triggers alarms in Brazil's biggest metropolis,” In Depth, H. Escobar, 20 February, p. [812][1]), such as water diversion projects to transpose water between isolated river basins,
Article
Full-text available
Pareiorhina pelicicei sp. n., a new Loricariidae, is described from the rio Grande, upper rio Paraná basin, southeastern Brazil. The new species differs from its congeners by combination of the following characters: teeth with a minute lateral cusp; absence of small plates scattered on the thorax and abdomen; tip of the snout naked; lower predorsal...
Article
Full-text available
A new species of the catfish genus Trichomycterus is described from tributaries of the upper rio Grande, rio Paraná basin, southeastern Brazil. Trichomycterus pirabitira new species is diagnosed by the morphology of the metapterygoid and the caudal fin, and number of vertebrae, branchiostegal rays and interopercular odontodes, relative position of...
Article
Full-text available
Cage aquaculture has been developed in many countries, including Brazil. This form of production, although economically productive, may cause several impacts to the environment. Considering the historical relationship between aquaculture and species introduction, our study investigated the potential of cage aquaculture in spreading non-native speci...

Projects

Projects (5)
Project
To evaluate the concequences of the availability of plastic (e.g., microplastics) in freshwater ecosystems.
Project
Conservation policy.
Project
Ichthyofauna of the Guareí River basin