A5058883001- Fish Ecology and Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Fish biology, ecology, and behavior
- Isotope Analysis in Ecology
- Soil and Water Nutrient Dynamics
- Coral and Marine Ecosystems Studies
- Aquaculture Nutrition and Growth
- Physiological and biochemical adaptations
- Hydrology and Sediment Transport Processes
- Hydrology and Watershed Management Studies
- Marine and fisheries research
- Marine Ecology and Invasive Species
- Marine and coastal plant biology
- Marine Bivalve and Aquaculture Studies
- Marine and coastal ecosystems
- Animal Ecology and Behavior Studies
- Animal Behavior and Reproduction
- Marine Sponges and Natural Products
- Mercury impact and mitigation studies
- Parasite Biology and Host Interactions
- Wildlife Ecology and Conservation
- Bat Biology and Ecology Studies
- Land Use and Ecosystem Services
- Genetic diversity and population structure
- Environmental and biological studies
Universidade do Estado do Rio de Janeiro
2015-2024
Universidade Federal do Pará
2023
Abstract The River Continuum Concept ( RCC ) assumes that autochthonous primary production in forest streams is limited by light and insufficient to sustain secondary consumers; they must therefore depend on allochthonous carbon from the surrounding forest. Recent studies have, however, questioned importance of stream food webs. There a growing body evidence using stable‐isotope techniques demonstrate algae (autochthonous production) webs tropical streams. actual contributions resources are...
According to the prevalent paradigm, major source of carbon and energy for food webs small forested streams in temperate regions is allochthonous material from surrounding forest. Tropical have not been as well studied there has some speculation that their are more aligned with in‐stream, algal production (autochthonous carbon). We sources consumers four sites a coastal tropical stream gradients 36–254 m elevation, 8–73% canopy cover 11.9–7.1 km 2 watershed area, expectation web would...
Riparian deforestation may strongly affect stream functioning, with consequences for biodiversity and ecosystem services. These effects can be assessed using bioindicators relating to biotic community structure functioning. We evaluated the of riparian on 1. measures aquatic benthic invertebrates, 2. an aspect leaf processing. selected sites along gradients land use in four Atlantic rainforest streams measured physical chemical properties their association deforestation. sampled...
Stream metabolism is affected by both natural and human-induced processes. While has multiple implications for ecological processes, relatively little known about how metabolic rates are influenced land use in tropical streams. In this study, we assessed the characteristics related environmental factors of six streams located a transition area from Cerrado to Atlantic Forest (São Carlos/Brazil). Three were preserved, while three flowing through more agriculturally and/or urban impacted...
Summary Periphytic algae are an important source of energy fuelling stream food webs. algal biomass can be controlled by bottom‐up and top‐down forces, but there few studies that have investigated these effects simultaneously, especially in tropical streams, where periphyton a very carbon source. Here, we the nutrients grazers predators coastal Brazil. We employed nutrient‐diffusing substrata to test for nutrient limitation, placed inside electric exclosures different intensities, which...
Abstract Nutrient limitation assessment is important to understand stream ecosystem functioning. Aquatic primary producers are often limited by nitrogen, phosphorus, or both, as assessed nutrient diffusing substrata (NDS), a common method for assessing in streams. But little known regarding how this relates patterns of uptake at the whole‐stream scale. We combined two techniques examine tropical stream. First, we conducted NDS experiments using ammonium, nitrate, and phosphate alone...
We estimated the net primary productivity of periphyton algae and rate macroinvertebrate grazing in a third-order stream coastal Atlantic forest, Brazil. Net was from growth curve chlorophyll, based on relationship between algal density production, with baetid ephemeropteran grazers excluded by high-intensity electric shocks. fit logistic model cite maximum 44.7 mg C m−2 d−1. manipulated pressure excluding shrimp Macrobrachium olfersi low-intensity electrical exclusion—the known to have...
Terrestrial allochthonous organic matter represents a structuring element and an important source of energy carbon to fauna in small forested streams. However, the role this as food resource for benthic macroinvertebrates, consequently, shredders their performance riverine processes, is not clear low-order tropical Aiming investigate relationship between leaves, we analyzed along gradient 8-93% canopy cover biomass abundance shredders, accumulated leaves breakdown rates local verify if these...
Abstract Leaves, epilithon, macrophytes, and fine benthic organic material are central ecosystem compartments to food webs mediate nutrient fluxes in streams. Most estimates of gross primary production ( GPP ) respiration ER made at a reach scale, averaging across compartments. Thus, there is little information on how individual contribute scale up whole‐stream watersheds. We compared , nitrogen (N) uptake (dm) stream reaches (~100 m) three sizes streams preserved Atlantic Rainforest...
Abstract The conversion of forests to agriculture in tropical areas profoundly changes adjacent streams by modifying hydrological conditions, altering light regimes, and increasing nutrient concentrations. In this study, we used an integrative approach examine how transformations intact affected the physical, chemical, biological properties periphyton, three Brazilian Atlantic rainforest streams. We found that riparian land use change stream periphyton a variety ways were linked availability...
There is interest in the relationships between macroconsumers (e.g. shrimp) and aquatic insects, as well their role ecological processes, including leaf breakdown, tropical freshwater environments. Many studies have shown that shrimp capacity to reduce abundance of insects (by predation behavioural inhibition) promote breakdown shredders. To discriminate these effects, we used fresh leaves Erythroxylum pulchrum manipulated presence by electric exclusion at high low intensities field. In...
Evidence so far shows that most alien species (AS) have negative impacts on native biodiversity and are changing in almost all environments. Here, we study eight rocky shores at four sites containing reefs with invaded communities other not-invaded (control) communities, to evaluate the effects of marine invasive biological functional diversity. We used adjustment selection approach abundance distribution models (SAD), taxonomic diversity indices based hierarchical grouping matrices...
When a species is introduced in new location, it common for to establish itself when finds favorable conditions the receptor community with regard interspecific interactions native species. The azooxanthellate corals Tubastraea coccinea and tagusensis are invasive Caribbean Sea, Gulf of Mexico, Brazilian Southwest Atlantic. They successful competitors space, have multiple reproductive modes, high larval dispersion recruitment, but studies on food trophic relationships genus still scarce. In...
The definition of conservation strategies and ecological assessment schemes requires understanding ecosystem patterns over multiple spatial scales. This study aimed to determine if macro-scale structural functional (processes) associated with stream ecosystems differed among three neotropical biomes (Cerrado, Amazon, Atlantic Forest). We compared the aquatic communities (benthic invertebrates hyphomycetes) processes (decomposition rates, primary production biofilms growth hyphomycetes...
The study of detrital food webs streams has revealed a variety dynamics, often implying the importance invertebrate fauna in breakdown leaves and sometimes showing effects predators trophic cascades. Such studies generally involve experimental manipulation component fauna. Leaf (or 'processing') is studied by isolating litter bags, which turn can have different mesh sizes used to exclude or permit action always carries risk introducing artefacts, care appropriate controls must be applied....
The acidification of samples for the simultaneous measurement stable carbon (δ13C) and nitrogen (δ15N) isotopes represents an important methodological question still not clarified because removal calcium carbonate (CaCO3) from may affect outcome stable-isotope analysis. We investigated effect on 25 different taxa benthic marine organisms a rocky shore, to determine whether affects isotopic values δ13C δ15N. After washing with distilled water drying, each sample was divided into two parts;...
Stable isotope analysis (SIA) has become an essential tool in Ecology, being increasingly used studies of fish tropical streams. The SIA allows to reconstruct the animals' diet and its intraspecific variation, trace contributions main basal resources throughout food web, calculate trophic position niche, including niche overlap alterations, build webs. is also understand impact environmental changes on communities other aquatic organisms. number such increasing Brazil, but there are still...
Abstract Consumer mineralisation of nutrients can affect ecosystem processes, such as primary productivity, community respiration and biogeochemical cycling. Researchers have not tested, however, the influence standard incubation methods on rates. Therefore, varied consumer rates is poorly understood. Here, we investigated how conditions affected ammonium phosphate two species fish shrimp. For each species, measured during day at night in environments (standard modified to reduce stress). We...
Secondary production estimates are an important element of ecosystem ecology because they facilitate quantification the roles consumers in material and energy cycling. We estimated resource consumption stream macroinvertebrates, along with metabolism organic matter storage 3 relatively undisturbed Savanna headwater streams southeastern Brazil. measured benthic macroinvertebrates reach-scale from October 2015 to September 2016. Mean annual values gross primary respiration varied 0.06 0.22...
Abstract In the highly diverse Rio Ubatiba in Brazil, native and historically abundant armoured catfish Hypostomus punctatus (Loricariidae) has been declining since 1990s, concomitantly with introduction of non‐native loricariid, Parotocinclus maculicauda . Here, we assess over an 18‐year period potential impact establishment invasive by examining dietary, tissue excretion nutrients these two species consequences substitution on nutrient remineralisation. To scale differences up to...
Abstract Ecological Stoichiometry (ES) and the Metabolic Theory of Ecology (MTE) are main theories used to explain consumers’ nutrient recycling. ES posits that imbalances between an animal’s body its diet stoichiometry determine excretion rates, whereas MTE predicts reflects metabolic activity arising from size temperature. We measured nitrogen, phosphorus N:P excretion, stoichiometry, size, temperature for 12 fish species a Brazilian stream. fitted competing models reflecting different...