Ronaldo Souza da Silva

• Doctor of Education
• PhD at Federal University of Acre

Natural landscapes have been altered due to the increasing demand for natural resources, leading to changes in physicochemical characteristics and species composition of several systems, including the aquatic. This study identified the streams and species that contributed the most to macrophyte beta diversity within and surrounding the Amazon Natio...

Few studies have investigated the ichthyofauna of streams in the upper Purus River basin, hampering efforts to understand the diversity of these numerous bodies of water. This study presents the first inventory of the ichthyofauna in the upper Purus-Antimary interfluve, southwestern Amazonia. The study was based on data compiled from various source...

In this study, we aimed to identify the factors that drive the patterns in beta diversity of fish assemblages on the beaches of the Volta Grande do Xingu, a river stretch under the influence of Belo Monte dam. Fishes were collected using a trawl net in 28 sandy beaches during the low water period of 2021 (each beach was sampled once during this per...

The Amazon floodplain is home to an extremely high diversity of fish, with lakes playing an important role in the establishment of this biological richness. These lacustrine environments are subject to constant fluctuations caused by the annual flood pulse, with local factors and other regional patterns also contributing to the variation in fish co...

We assessed the spatiotemporal co-occurrence patterns of a fish assemblage in the watershed of a stream in the western Amazon basin, and verified the influence of abiotic factors (physicochemical variables and the hydrological phase) on these patterns. We also examined whether species that were more similar in their tolerance of physicochemical var...

The length-weight relationship (LWR) was estimated for six fish species of the order Characiformes: Curimatella meyeri, Hoplias malabaricus, Potamorhina altamazonica, Potamorhina latior, Pygocentrus nattereri, Schizodon fasciatus, collected from oxbow lakes on the floodplain of the middle Purus River in western Brazilian Amazonia. The specimens wer...

Fishes of the family Trichomycteridae are widely distributed in South America, but there are knowledge gaps in the distribution range of some species, mainly in the western of the Brazilian Amazon. Here, we present new records of Pseudostegophilus nemurus in the Acre State, Brazil, and provide information on growth and diet. Specimens were collecte...

The objective of this study was to inventory the community of cladocerans associated with macrophytes in oxbow lakes of the Chandless River, located within the Chandless State Park, during the local dry season. In three lakes covered with macrophytes, 90 sample units were collected, arranged over nine transects. Twenty species of cladocerans were f...

Small streams and rivers draining tropical forests hold about 60% of the known Neotropical fish species. The Amazon basin has the greatest ichthyofaunistic diversity in the world, with more than 2.716 species, of which, about 1.696 are endemic. These fishes are not restricted to large rivers, but they also inhabit numerous streams, locally called I...

Fishery is one of the most important economic activities in the Amazon, which is responsible for 25% of the Brazilian fish production. However, there are few surveys related to identification of commercial fish species in many areas of the Amazon basin. Therefore we undertook a survey of the commercial fish species at the Resene de Souza Lima Marke...

RESUMO Pequenos riachos e rios de florestas tropicais abrigam cerca de 60% das espécies de peixes neotropicais conhecidas. A bacia Amazônica possui a maior diversidade ictiofaunística do mundo, com mais de 2.716 espécies, das quais, cerca de 1.696 são endêmicas. Esses peixes não são restritos aos grandes rios, mas também habitam numerosos riachos,...

Despite increasing efforts in recent years to catalog the fish diversity of Amazonian rivers, many regions are still under-sampled, and sandy beach environments are particularly poorly understood. The present study focused on a 300 km stretch of the Acre river, in the southwestern Amazon basin, where we sampled 30 sandy beaches separated by a mean...

The length‐weight relationship (LWRs) was estimated for eight fish species collected from oxbow lakes on the floodplain of the middle Purus River in western Brazilian Amazonia in January, May, and September 2012. The specimens were collected using 12 gillnets (80 m in length × 4 m in height, meshes of between 1.5 cm and 12.0 cm), which were set dur...

We analyzed the length‐weight relation (LWRs) of 14 species of fish, sampled in 30 sandy beaches along the Acre river, encompassing approximately 300 km of the river between the municipalities of Brasileia and Rio Branco, Acre state, Brazil, during the draught period in 2017 (August and September). For sampling, we used a picaré type trawl with 9 m...

INTRODUÇÃO: A Família Arecaceae possui distribuição termocosmopolita (de 44 o N a 44 o S), sendo que a flora amazônica apresenta expressiva riqueza: entre 200 e 250 espécies, com diversos endemismos. No Estado do Acre são registrados 24 gêneros e 82 espécies, a maior parte de ocorrência no Alto Juruá, extremo ocidente do Brasil. A família é usada c...