Sidinéia Amadio

• PhD
• Researcher at Instituto Nacional de Ciência e Tecnologia de Adaptações da Biota Aquática da Amazônia

Os relatórios do Painel Intergovernamental de Mudanças Climáticas (IPCC) têm mostrado consistentemente que a Amazônia está cada vez mais quente e seca devido às mudanças climáticas e ao aumento do desmatamento. Esses fatores têm tornado os eventos extremos de cheia e seca mais frequentes, especialmente desde os anos 2000, gerando degradação dos amb...

Aquatic protected areas and co-management have been proposed as strategies for conserving fisheries resources in several world regions. We analyzed the effects of different levels of governance on yield of experimental fisheries in Amazonian floodplain lakes. Sampling between 2018 and 2022 used gill nets deployed for 24 h during flooding and recedi...

The spatial distribution of biological communities may be regulated by environmental and spatial processes, and the intensity of these processes depend on the species characteristics, spatial heterogeneity and spatial extent. We investigated the relationship between the non-migratory fish metacommunity with environmental and spatial variables using...

Cichla vazzoleri é uma das espécies de tucunaré com grande importância econômica no reservatório de Balbina (UHE Balbina, no rio Uatumã, entorno da REBIO Uatumã, estado do Amazonas), pois é alvo da pesca comercial e recreativa. Devido à elevada pressão da pesca por quase 40 anos, o estoque e o tamanho desses peixes diminuiu. Neste artigo examinamos...

Floating structures, both natural and artificial, attract fish by providing shelter, feeding areas, and nesting sites. Occupancy can be either more permanent, leading to a gradual gathering of the assembly, or transient, occurring randomly. The ability of an attractor to hold a fish assemblage may depend on the availability of habitat resources in...

Este trabalho apresenta a infraestrutura computacional e-DIVA, que constitui um processo de integração de bases de dados ictiológicas referentes a diferentes sítios de pesquisa, além de oferecer um cenário computacional para gestão e análise dos dados científicos relacionados ao Programa de Pesquisa Ecológica de Longa Duração: Diversidade da Várzea...

A reprodução em peixes varia principalmente mediante aspectos bióticos dos organismos. Um aspecto marcante é a relação entre fecundidade e tamanho das fêmeas e o investimento em fecundidade dependendo da condição ambiental, particularmente frente ao estresse fisiológico gerado por eventos como as secas. Assim, este estudo teve como objetivo avaliar...

Mercury (Hg) bioaccumulation can be influenced by biological characteristics (e.g., trophic position) and environmental changes (e.g., seasonal flood-pulse), as it can create site conditions conducive to methylation and alter the availability of food to biota. This study aimed to relate total mercury (THg) and methylmercury (MeHg) concentrations in...

Doce años después de la celebración del I Simposio Iberoamericano de Ecología Reproductiva, Reclutamiento y Pesquerías-SIBECORP y de la creación de la Red Iberoamericana de Investigación Pesquera-Red INVIPESCA tenemos entre manos una publicación que resume y compila los conocimientos compartidos en las cuatro ediciones de SIBECORP celebradas hasta...

Abnormal hydroclimatic years in the Amazon have been increasingly frequent in the last two decades, creating more prolonged droughts and severe floods. These events are expected to impact organismal phenology, including seasonal reproduction of fish. Droughts are also expected to increase fish mortality and vulnerability to fishing. However, empiri...

• Understanding the factors that regulate temporal changes in population size is a core aspiration in ecology given the importance of population stability on the maintenance of species interactions, effects on local communities, the stability of ecosystems, and for biodiversity conservation. Understanding temporal trends in population size can supp...

In Amazonia, commercially important fish species—such as Semaprochilodus insignis—are highly dependent on the hydrological regime, that is, the flood pulse. As waters begin to rise, this species migrates from nutrient-poor rivers to nutrient-rich rivers via their associated floodplains, using such habitats as spawning and nursery grounds. However,...

Aim Evaluating how groups of organisms vary in dispersal capability and how environmental, spatial and temporal signals vary across multiple scales is critical to elucidating metacommunity theory. We examined whether the relative contributions of environmental, spatial and hydrological factors have different effects on organismal groups with differ...

Differences in food intake and morphological attributes may facilitate the coexistence of detritivorous fish. The present study investigated the possible differences in the feeding strategies of four species of curimatids that inhabit the floodplain of the central Amazon. For this, we determined the diet, daily food cycle, and whether characteristi...

Length‐weight relationship (LWR) for 39 freshwater fish species captured in the Catalão Lake, a floodplain area at the confluence of the Amazonas and Negro rivers is presented. LWRs were calculated based on fish sampled over 18 years (1999–2017) using a set of ten gill nets with different mesh sizes, monthly immersed in water for 24‐hr with 6‐hr in...

In Amazonia, commercially important fish species—such as Semaprochilodus insignis— are highly dependent on the hydrological regime, that is, the flood pulse. As waters begin to rise, this species migrates from nutrient-poor rivers to nutrient-rich rivers via their associated floodplains, using such habitats as spawning and nursery grounds. However,...

Com o propósito de identificar os impactos da variação climática na vida aquática da várzea da Amazônia Central, foi proposto um novo sítio do Programa de Pesquisa Ecológica de Longa Duração: Diversidade da Várzea (PELD-DIVA). Este trabalho apresenta a infraestrutura computacional e-DIVA, que constitui um processo de integração de diversas bases de...

Seasonal environments favor the evolution of capital breeding, whereby reproduction uses surplus energy from resources acquired during an earlier period. Consequently, reproductive effort in capital breeders is expected to depend on traits associated with energy storage rather than environmental conditions at the time of reproduction. Based on a 15...

For some tropical fishes, the information on growth parameters is still scarce, and few or no records are available in FishBase. Therefore, the objectives of this study are to estimate the growth curves for Brycon amazonicus (Spix & Agassiz, 1829), Piaractus brachypomus (Cuvier, 1818), Prochilodus nigricans Spix & Agassiz, 1829, Semaprochilodus ins...

This study records the occurrence of a hermaphrodite individual of the apapá Pellona flavipinnis captured in a floodplain area of the Amazon River. Histology of the left gonad revealed the presence of testicular germ cells (spermatocytes and spermatozoa) in the cranial portion and mature ovarian cells (primary and vitellogenic oocytes) in the cauda...

Using morphometric measurements and wavelets functions, the asterisci otoliths of curimatã, Prochilodus nigricans were analysed to identify the variation in shape and growth increment of individuals from Solimões, Japurá and Negro rivers of the Amazon basin, Brazil. The morphometric and morphological analyses did not reveal evidences of population...

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...

Apistogramma agassizii is a dwarf cichlid species endemic of the Amazon basin, about which there is little biological and ecological information in their natural habitat, despite their ornamental importance. This study evaluated the populacional structure A. agassizii at Amana Sustainable Development Reserve, Middle Solimões basin, Amazonas, Brazil...

Combined effects of climate change and deforestation have altered precipitation patterns in the Amazon. This has led to changes in the frequency of extreme events of flood and drought in recent decades and in the magnitude of the annual flood pulse, a phenomenon that influences virtually all aspects of river-floodplain ecosystem dynamics. Analysis...

Apistogramma agassizii is a dwarf cichlid species endemic of the Amazon basin, about which there is little biological and ecological information in their natural habitat, despite their ornamental importance. This study evaluated the populacional structure A. agassizii at Amana Sustainable Development Reserve, Middle Solimões basin, Amazonas, Brazil...

The temporal effect of discharge and limnology on fish composition and species diversity in a floodplain lake at the confluence of the Amazon and Negro Rivers was evaluated. Species richness, abundance and assemblage composition were strongly influenced by seasonal discharge of the Amazon and Negro Rivers, which affects lateral connectivity, water...

This study aimed to estimate age and growth of the peacock bass Cichla temensis from the rio Negro (Brazilian Amazonia) by analyzing scale annuli. Specimens were captured between October 2011 and September 2012 in the main channel of the river and in adjacent lakes in the municipality of Barcelos, AM, Brazil. Six growth checks were identified on th...

The cichlid Mesonauta festivus is common and abundant among macrophyte stands along a large geographical range of the Amazonas and Paraná-Paraguay basins, in South America. This broad geographical range highlights the species’ dispersion ability, which can be attributed to specific biological and behavioral traits. However, the dispersion ability d...

Hypotheses about phylogenetic relationships among species allow inferences about the mechanisms that affect species coexistence. Nevertheless, most studies assume that phylogenetic patterns identified are stable over time. We used data on monthly samples of fish from a single lake over 10 years to show that the structure in phylogenetic assemblages...

This work was presented during the Semana da Ciência e Tecnologia [Week of Science and Technology, (21-10-2013 to 02-11-2013)]. The group has also developed activities of visiting to the research group laboratory, as well as, a puppet theatre activity about the life cycle of Semaprochilodus insignis, whose script was adapted from the children's st...

The group has developed activities of visiting of the research group laboratory, as well as, a puppet theatre activity about the life cycle of Semaprochilodus insignis, whose script was adapted from the children's story "O Pequeno Pinguim" [The little penguin] written by A. J. Wood. A poster regarding the life cycle of Semaprochilodus was also pres...

The Parque Estadual do Cantão is a protected area in the Araguaia River. In a survey carried out during a complete hydrological cycle, 271 species of fish, belonging to 183 genera, 41 families and 12 orders were captured. Characidae was the most diverse family with 89 species (32.6% of the total), followed by Loricariidae with 23 species (8.4%) and...

The ornamental discus fish Symphysodon aequifasciatus Pellegrin, 1904, is a popular endemic cichlid species from the Amazon basin, however scientific information concerning biology and ecology in its natural habitat is scarce despite its importance on the international aquarium trade. In this study we evaluated reproductive parameters of S. aequifa...

The study considered the influence of the hydrological cycle and gonadal development on the accumulation and use of energy in three fish species from an Amazonian flooded area. Fishes were sampled over a 24 hour period at monthly intervals between July 2004 and June 2005 using gillnets of different mesh sizes. Body cavity fat and gonadosomatic indi...

The feeding habits of Pellona flavipinnis (Valenciennes, 1836) at Catalão, a floodplain area on the Brazilian Central Amazon was studied. Data was obtained during three hydrological cycles, between September 1999 and September 2003. Diet composition, daily and seasonal variation in the feeding activity and the relationship between predator's size a...

During fish samplings carried out between 2004 and 2005 in tributaries draining the rapids stretch of Madeira River in Brazilian Amazon, we captured 72 specimens of Roestes molossus, a rare and poorly known cynodontid species. These specimens comprised 1.17 % of the total catches with gillnets (out of 175 species), the smallest measuring 114 mm SL...

Abstract – The influence of hydrologic cycle and trophic groups on the energy content of food was investigated for five fish species from a Central Amazonian floodplain area. Sampling was carried out monthly using gillnets of different mesh sizes immersed in water for 24 h. We examined the presence and absence of food in fish stomachs and those wit...

Seasonal variations of the water level is the most important factor in determining the community of aquatic organisms present in flooded areas in the Amazon. Many scientific projects developed in this region were and still are being carried out in flooded areas near the city of Manaus; however, data can rarely be compared due to a non-standardized...

Seasonal variations of the water level is the most important factor in determining the community of aquatic organisms present in flooded areas in the Amazon. Many scientific projects developed in this region were and still are being carried out in flooded areas near the city of Manaus; however, data can rarely be compared due to a non-standardized...