Papers by Marcelo dos Anjos
PNAS, 2025
Unlike most rivers globally, nearly all lowland Amazonian rivers have unregulated flow, supportin... more Unlike most rivers globally, nearly all lowland Amazonian rivers have unregulated flow, supporting seasonally flooded floodplain forests. Floodplain forests harbor a unique tree species assemblage adapted to flooding and specialized fauna, including fruit-eating fish that migrate seasonally into floodplains, favoring expansive floodplain areas. Frugivorous fish are forest-dependent fauna critical to forest regeneration via seed dispersal and support commercial and artisanal fisheries. We implemented linear mixed effects models to investigate drivers of species richness among specialized frugivorous fishes across the ~6,000,000 km2 Amazon Basin, analyzing 29 species from 9 families (10,058 occurrences). Floodplain predictors per subbasin included floodplain forest extent, tree species richness (309,540 occurrences for 2,506 species), water biogeochemistry, flood duration, and elevation, with river order controlling for longitudinal positioning along the river network. We observed heterogeneous patterns of frugivorous fish species richness, which were positively correlated with floodplain forest extent, tree species richness, and flood duration. The natural hydrological regime facilitates fish access to flooded forests and controls fruit production. Thus, the ability of Amazonian floodplain ecosystems to support frugivorous fish assemblages hinges on extensive and diverse seasonally flooded forests. Given the low functional redundancy in fish seed dispersal networks, diverse frugivorous fish assemblages disperse and maintain diverse forests; vice versa, diverse forests maintain more fish species, underscoring the critically important taxonomic interdependencies that embody Amazonian ecosystems. Effective management strategies must acknowledge that access to diverse and hydrologically functional floodplain forests is essential to ensure the long-term survival of frugivorous fish and, in turn, the long-term sustainability of floodplain forests.
Journal of applied ichthyology, Feb 23, 2024
Studies on the production of Pimelodidae catfsh in the Amazon are generally carried out in large ... more Studies on the production of Pimelodidae catfsh in the Amazon are generally carried out in large fshing centers. However, the data referring to small-scale fsheries have gaps that can represent a risk to the activity. Tis study evaluated the volume produced and the revenue obtained from migratory catfsh of the Pimelodidae family of commercial interest landed in Humaitá, Amazonas, Brazil, from May 2018 to April 2019. Daily monitoring was carried out with the Z-31 Fishermen's Colony through questionnaires to fshermen for each vessel docked. Te total production was 6013.93 kg, with 1,689 fsh counted and 13 species. A total of 186 landings by 122 fshermen in 24 fshing sites characterized as rivers, lakes, and "igarapés" were evaluated. Te average selling price was R$5.57/kg, and the highest volumes were obtained from July to September, mainly with gillnets, where the "Surubim" Pseudoplatystoma punticfer had the highest volume and revenue. Low productivity was verifed in most localities, characterizing the fshing as artisanal. Te lack of adequate conditions for storing and transporting fsh, the local hydrological variations, and the presence of hydroelectric plants on the Madeira River are major factors limiting the fshing expansion in southern Amazonas.
o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição... more o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição 4.0 Internacional (CC BY 4.0). O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais. Ciências Humanas e Sociais Aplicadas 1. Agricultura. 2. Produtos químicos agrícolas. I. Jasper, Mônica.
Acta Limnologica Brasiliensia, Dec 1, 2015
The goal of this study was to analyze the effects of predation by nymphs of Erythemis Hagen, 1861... more The goal of this study was to analyze the effects of predation by nymphs of Erythemis Hagen, 1861 on Elmidae and Chironomidae and to check if the presence and the architecture of aquatic macrophytes may mediate this interaction. Methods: All prey as well as nymphs were captured near macrophytes in a small lagoon alongside a highway near Humaitá, Amazonas, Brazil. Twelve buckets were used in three different treatments: with Pistia stratiotes Linnaeus, 1753, with Salvinia auriculata Aublet and without macrophytes. Results: We found a mortality rate of 100% of Chironomidae and Elmidae larvae in the treatment without macrophytes. There was a greater survival of Elmidae compared to Chironomidae in the treatments with P. stratiotes and S. auriculata; however, there was a greater survival of both preys on treatment with P. stratiotes. Conclusions: We conclude that the presence of macrophytes decreased the efficiency of predation of Erythemis nymphs under experimental conditions. The architecture of macrophytes affected predation as macrophytes with longer roots and with greater habitat complexity promoted a greater survival of prey.
o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição... more o conteúdo deste livro está licenciado sob uma Licença de Atribuição Creative Commons. Atribuição 4.0 Internacional (CC BY 4.0). O conteúdo dos artigos e seus dados em sua forma, correção e confiabilidade são de responsabilidade exclusiva dos autores. Permitido o download da obra e o compartilhamento desde que sejam atribuídos créditos aos autores, mas sem a possibilidade de alterá-la de nenhuma forma ou utilizá-la para fins comerciais. Ciências Humanas e Sociais Aplicadas 1. Agricultura. 2. Produtos químicos agrícolas. I. Jasper, Mônica.
Australian Journal of Crop Science, Oct 1, 2022
The present study aimed to evaluate the effect of alternative products on the control of coffee b... more The present study aimed to evaluate the effect of alternative products on the control of coffee brown-eye spot and coffee rust. The experiment was carried out in two conilon coffee plantations, in the following agroforestry system models: a) continuous system (SM-1) and b) mixed system (SC-2). The following treatments were used: i) aqueous plant extract of Himatanthus sucuuba (2%) -SUC, ii) Bordeaux mixture (2%) -CB and iii) control (water). Four monthly samplings of the temporal progress of the diseases were carried out, during the period from October/2019 to January/2020, evaluating the symptoms in three leaves per plant, one from each of the upper, middle and lower thirds of the plant. Incidence percentages were determined according to the number of leaves with symptoms in relation to the total number of leaves sampled. In order to estimate severity, diagrammatic scales were used for each disease evaluated. The obtained data were submitted to routine statistical analysis in R programming with a significance of 5%. Interaction effects were not significant according to the ANOVA test. Significant differences were observed among the treatments studied for the two diseases with the following results: percent reduction of rust incidence: (SUC -50%, CB -80% and TEST -95%) and percent reduction of brown-eye spot: (SUC -30%, CB -60 % and TEST -80%). SUC treatment was more effective in reducing disease severity with the following results: (SUC -0.26%, CB -0.40% and TEST -0.83%) and (SUC -0.35%, CB -0.41% and TEST -0.99%) for rust and brown-eye spot diseases, respectively. The treatment (SUC) proved to be a promising alternative product for the management of brown-eye spot and rust diseases.
Evolução e Conservação da Biodiversidade, Oct 16, 2015
<p>A bacia Amazônica abriga a maior diversidade de peixes de água d... more <p>A bacia Amazônica abriga a maior diversidade de peixes de água doce do mundo. O objetivo deste estudo foi analisar as assembleias de peixes em igarapés de terra firme em duas sub-bacias do Médio Rio Madeira. O estudo foi realizado em duas sub-bacias no Médio Rio Madeira localizadas em terras indígenas. Foram coletados 475 indivíduos, distribuídos em 55 espécies. As curvas do coletor e de rarefação indicam esforço amostral satisfatório. A ordem Characiformes foi a mais abundante. A espécie mais abundante foi <em>Potamorhina latior</em> e a mais amplamente distribuída foi <em>Crenicichla lenticulata</em>. A cor da água estruturou a assembleia de peixes em igarapés na área de estudo com maior diversidade de espécies em igarapés de água preta. Diferenças entre águas pretas, brancas e claras são óbvias, mas mais estudos sobre assembleias de peixes nestes ambientes da bacia Amazônica são necessários.</p>
Acta zoológica mexicana, Oct 10, 2019
The goal of this work was to know the effect of precipitation in four periods (Rising, Flood, Low... more The goal of this work was to know the effect of precipitation in four periods (Rising, Flood, Lowing and Dry) on Odonata larvae living near to the macrophyte Salvinia auriculata Aubl., in Been River, Amazonas, Brazil. The biological material was collected in the Been river in the section near the river Madeira, state of Amazonas, Brazil. Sampling was conducted in stands of three macrophytes S. auriculata in four periods: rising (November 2012), flood (February 2013), lowing (May 2013), and dry (August 2013). A total of 286 Odonata larvae were identified in the river studied. Six families and 14 genera were identified. The flood period showed the highest abundance in the studied period. Acanthagrion presented a positive correlation with flood period in axis 1 and Telebasis also positive, but in the dry period. In conclusion, although there are few studies on Odonata larvae associated with floating macrophytes in the Amazon, the results of this work showed the importance of knowing the distribution of larval abundance throughout the year. Flood and dry period showed to be the period with the highest abundance of Odonata genera. In addition, the principal component analysis showed that some species are more sensitive to the periods of the year, Telebasis in the dry period and Acanthagrion in the flood period.
Acta Scientiarum. Biological Sciences, Oct 1, 2015
Biota Neotropica, Jun 1, 2015
The goal of this study was to investigate the effect of temperature on the life cycle of Acanthag... more The goal of this study was to investigate the effect of temperature on the life cycle of Acanthagrion nymphs sampled in a stream in the southern state of Amazonas. Altogether, 50 nymphs (10 in each of the five treatments) with ambient temperatures of 16, 20, 24, 28 and 32°C and water temperatures of 18, 22, 26, 30 and 34 o C, respectively, were used. The only treatment that had a hatching adult was at a temperature of 28 o C, identified in a single species, Acanthagrion apicale. In all other treatments (16, 20, 24 and 32 o C), all nymphs died, respectively 1, 1, 3 and 2 days. We conclude from the results of this study that controlling water temperature near 28°C was the most efficient for obtaining adult A. apicale, and that this temperature was close to the average temperature where the nymphs were sampled, indicating that the control of this variable in artificial conditions is extremely important to obtain adults from nymphs.
International Journal of Social Ecology and Sustainable Development, Jan 31, 2022
The goal of this work was to perform preliminary surveys over the abiotic factors of Roosevelt ri... more The goal of this work was to perform preliminary surveys over the abiotic factors of Roosevelt river, Amazonas, Brazil in four different periods: rising, flood, lowing, and dry. Four sites were monitored: P1, P2, P3 and P4. There were measured: depth, water transparency, conductivity, pH, surface water temperature and dissolved oxygen. Results showed a seasonality at the four sampling stations. The conductivity always showed high values in the flood at all sampling stations, except for P4. The pH showed low variation in all periods and sampling stations. Only depth and transparency were significant in P2. We conclude that studies are required that indicate the potential causes of conductivity variation: autochthonous or human activities. The explanation of the conductivity source is necessary since the studied area is located near a conservation area.
Current Biology
Biodiversity loss is one of the main challenges of our time and attempts to address it require a ... more Biodiversity loss is one of the main challenges of our time and attempts to address it require a clear understanding of how ecological communities respond to environmental change across time and space. While the increasing availability of global databases on ecological communities has advanced our knowledge of biodiversity sensitivity to environmental changes vast areas of the tropics remain understudied. In the American tropics, Amazonia stands out as the world's most diverse rainforest and the primary source of Neotropical biodiversity, but it remains among the least known forests in America and is often underrepresented in biodiversity databases. To worsen this situation, human-induced modifications may eliminate pieces of the Amazon's biodiversity puzzle before we can use them to understand how ecological communities are responding. To increase generalization and applicability of biodiversity knowledge it is thus crucial to reduce biases in ecological research, particularly in regions projected to face the most pronounced environmental changes. We integrate ecological community metadata of 7,694 sampling sites for multiple organism groups in a machine learning model framework to map the research probability across the Brazilian Amazonia, while identifying the region's vulnerability to environmental change. 15%–18% of the most neglected areas in ecological research are expected to experience severe climate or land use changes by 2050. This means that unless we take immediate action, we will not be able to establish their current status, much less monitor how it is changing and what is being lost.
Biota Neotropica
Every activity that involves exploitation of natural resources, such as fishing, needs to be orga... more Every activity that involves exploitation of natural resources, such as fishing, needs to be organized and conducted based on information from monitoring programs to allow continuous evaluation. With the increasing fishing pressure in Brazil, the understanding of the importance of fisheries monitoring programs and how they can inform and assist in conservation decision-making remains limited. Based on the literature on fisheries and participatory conservation, we call attention to the need to generate information on the national fisheries sector in order to improve fisheries in the country. Given the context of the need to generate information on fishing stocks under exploitation, as well as to identify potential alternative fisheries and carry out various sectoral analyses in compliance with the 2030 Agenda for Sustainable Development, we present and discuss in the present paper the lack of a system of continuous fishing monitoring in Brazil and its effects on the fisheries sustain...
Neotropical Ichthyology
Recent studies in eastern Amazon coastal drainages and their surroundings have revealed new fish ... more Recent studies in eastern Amazon coastal drainages and their surroundings have revealed new fish species that sometimes exhibit little morphological differentiation (cryptic species). Thus, we used a DNA-based species delimitation approach to test if populations showing the morphotype and typical character states of the Aphyocharax avary holotype correspond either to A. avary or A. brevicaudatus, two known species from the region, or if they form independent lineages, indicating cryptic speciation. WP and GMYC analyses recovered five lineages (species) in the ingroup, while a bPTP analysis delimited three lineages. ABGD analyses produced two possible results: one corroborating the WP and GMYC methods and another corroborating the bPTP method. All methods indicate undescribed cryptic species in the region and show variation from at least 1 to 4 species in the ingroup, depending on the approach, corroborating previous studies, and revealing this region as a possible hotspot for discov...
Herpetology Notes, Jul 17, 2021
International Journal of Social Ecology and Sustainable Development, 2022
The goal of this work was to perform preliminary surveys over the abiotic factors of Roosevelt ri... more The goal of this work was to perform preliminary surveys over the abiotic factors of Roosevelt river, Amazonas, Brazil in four different periods: rising, flood, lowing, and dry. Four sites were monitored: P1, P2, P3 and P4. There were measured: depth, water transparency, conductivity, pH, surface water temperature and dissolved oxygen. Results showed a seasonality at the four sampling stations. The conductivity always showed high values in the flood at all sampling stations, except for P4. The pH showed low variation in all periods and sampling stations. Only depth and transparency were significant in P2. We conclude that studies are required that indicate the potential causes of conductivity variation: autochthonous or human activities. The explanation of the conductivity source is necessary since the studied area is located near a conservation area.
The southwest area of the Brazilian Amazon is composed of a landscape mosaic with transition gras... more The southwest area of the Brazilian Amazon is composed of a landscape mosaic with transition grasslands and tropical rain forest. The basin of the Puruzinho River, located in the "Arc of Deforestation" in the Purus-Madeira interfluve, has undergone changes in land use and land cover. The objective of this study was to evaluate the spatial variation of biophysical indices of a heterogeneous landscape in the Basin of Puruzinho River. The normalized difference vegetation index (NDVI), leaf area index (LAI), surface temperature, surface albedo and surface net radiation (Rn) were estimated by SEBAL (Surface Energy Balance Algorithm for Land) from TM Landsat 5 images, and analyzed on areas of dense forest, grasslands, deforested area and urban area of Humaitá-AM. All biophysical indices were significantly different considering the land use and land cover. The biophysical indices showed an opposite pattern between the urban area and the dense forest, with lower NDVI, IAF and net ...
Com a crescente demanda global por alimentos ha aumento do impacto ambiental das atividades para ... more Com a crescente demanda global por alimentos ha aumento do impacto ambiental das atividades para producao animal e agricola sobre a biodiversidade, ocasionando reducao cada vez mais acentuada de insetos e artoprodes. Porem, os servicos ecologicos fornecidos pela biodiversidade podem ser importantes para a producao sustentavel de alimentos em sistemas agroflorestais. Nessa revisao bibliografica objetivou-se elucidar como insetos e artropodes podem ser beneficos em sistemas de producao agropecuarios, em especial sistemas agroflorestais (SAFs). A diversidade desses organismos auxilia na conservacao e preservacao do meio ambiente dentro e no entorno desse tipo de uso da terra. Alem disso, pesquisas cientificas constataram que o nicho ecologico de insetos e outros tipos de artropodes sao essencialmente importantes para a ciclagem de nutrientes e manutencao da sustentabilidade e producao dos agroecossistemas. As monoculturas, quando comparadas com sistemas agroflorestais, provocam signifi...
O objetivo deste trabalho foi investigar o processo de colonizacao de macroinvertebrados durante ... more O objetivo deste trabalho foi investigar o processo de colonizacao de macroinvertebrados durante a decomposicao de Eichhornia azurea na lagoa Paraiso, sul do estado do Amazonas. O estudo foi realizado no periodo de menor precipitacao (agosto a outubro de 2012) e maior precipitacao (janeiro a marco de 2013). Foram utilizados 21 litter bags para o processo de colonizacao e 21 para o estudo da decomposicao de E. azurea . Os litter bags foram cuidadosamente amarrados um a um nos maiores bancos de E. azurea da lagoa. Os litter bags foram removidos aleatoriamente, respectivamente, no 1o, 3o, 7o, 14o, 28o, 56o, e 72o. As variaveis ambientais medidas foram o oxigenio dissolvido e a temperatura da agua. Ao todo foram identificados 6562 e 6693 macroinvertebrados nos periodos de menor e maior precipitacao, respectivamente. Concluimos, neste trabalho, que o processo de decomposicao na lagoa Paraiso, Amazonas, parece ser mais rapido quando comparamos a perda de biomassa de E. aurea em comparacao...
Latin American Data in Science, 2021
The Amazon is very important regarding the continental extractive fishing as it has the greatest ... more The Amazon is very important regarding the continental extractive fishing as it has the greatest diversity of freshwater fish in the world. Some factors can contribute to identify significant changes in fish production, such as characterization based on common names, and synonyms or classifications only at the genus level. This creates noise in different types of analyzes and mistakes in determining effective productions, as well as levels of exploitation for management. Thus, this study aims to demonstrate the variation in fish production over the years 2001 and 2013, using control data from the fishing colony "Dr. Renato Pereira Gonçalves Z-31" in the municipality of Humaitá, southern Amazonas. These data were analyzed by collaborators from the Laboratory of Ichthyology and Fisheries Management of the Madeira River Valley, at the Federal University of Amazonas. The fish landing monitoring allowed the determination of the species caught in the regional fishery and evaluat...
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Papers by Marcelo dos Anjos